Onan NHC Series Operator'S/Service Manual And Parts Catalog Download Page 244

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Summary of Contents for NHC Series

Page 1: ...D OG D D D OPERATOR S SERVICE MANUAL AND PARTS CATALOG FOR SERIES NHC NHCV INDUSTRIAL ENGINES 940 0404 11B74 Replaces 2A73 Printed in U S A ...

Page 2: ...G PARTS ADDITIONAL COPIES ARE AVAILABLE FOR A NOMINAL CHARGE FROM YOUR DISTRIBUTOR WHEN ORDERING PARTS REMEMBER TO INCLUDE THE MODEL SPECIFICATION LETTER AND SERIAL NUMBER LOCATED ON THE UNIT NAMEPLATE THIS IS ESSENTIAL TO ENSURE THE CORRECT PART IS SHIPPED TO YOU FOR REPAIR SERVICE CONTACT YOUR AUTHORIZED SERVICE REPRESENTATIVE WARNING TO AVOID POSSIBLE PERSONAL INJURY OR EQUIPMENT DAMAGE AN AUTH...

Page 3: ...e for a period ot one f 11 year from lhe dale each product is placed in service so longas such producl is installed operated and serviced in accordance wilh Manufaetuier s written instroctions I H I S WAK KAN Y IS IN 11EU OF A L I OTIIER W A R R A N T I E S EXPRESSKU OR I M P L I E D INCLUDING FITNESS FOR A PARTICULAR PURPOSE IblManufaciurcr s liabilily and purchasers sole remedy for a failure ofG...

Page 4: ... protec tive shields or touching electrical equipment Use rubber insulative mats placed on dry wood plat forms over floors that are metal or concrete when around electrical equipment Do not wear damp clothing particularly wet shoes or allow skin surfaces to be damp when handling electrical equipment Jewelry is a good conductor ot electricity and should be removed when working on electrical equipme...

Page 5: ...tilation Required cfm 3600 rpm NHC 1080 cfm 3600 rpm NHCV 1200 Oil Capacity 3 1 2 quart Oil Capacity with Filter Change 4 quart Starting Electric Ignition Battery Combustion Air cfm 3600 rpm 80 Fuel Gasoline regular grade Fuel Pump Diaphragm 4 ft lift Battery 12 Volt TUNE UP SPECIFICATIONS Spark Plug Gap 025 inch Breaker Point Gap 016 inch Ignition Timing Fixed Electric Start Units 20 BTC Tappets ...

Page 6: ...Rod End Play Ductile Iron Timing Gear Backlash Oil Pump Gear Backlash Piston to Cylinder Strut Type Measured below oil controlling ring 90 from pin Clearance Piston Pin Diameter Piston Pin in Piston Piston Pin in Rod Piston Ring Groove Width TUP 1 Top 2 Top 3 Piston Ring Gap in Cylinder Piston Ring Side Clearance Top compression ring only Crankshaft Main Bearing Journal Standard Size Main Bearing ...

Page 7: ...ecting Rod Bolt 27 29 Flywheel Capscrew 35 40 Starter Mounting Bracket to Oil Base Screws 43 48 Gear Case Cover 8 10 Oil Pump 7 9 Other 3 8 Cylinder Block Nuts 18 23 Intake Manifold 18 20 Exhaust Manifold 10 12 SPECIAL TOOLS SPECIAL TOOLS These tools are available from Onan to aid service and repairwork Crankshaft Gear Pulling Ring 420 0248 Flywheel Puller 420 0100 Combination Bearing Remover Main...

Page 8: ...earance a Broken Valve Spring a Valve or V a l v e Seal L e a k i n g e Piston Rings Worn or Broken a Wrong Bearing Clearance COOLING SYSTEM AIR COOLED Poor Air C i r c u l a t i o n Dirty or O i l y Cooling Fins Blown Head Gasket C O O L I N G S Y S T E M WATER COOLED Insufficient Coolant ft Faulty Thermostat Worn Water Pump or Pump Seal Water Passages Restricted Defective Gaskets Blown Head Gask...

Page 9: ...load generates heat during operation The heated air outlet must allow the heated air to escape freely and prevent recirculation with the cooling air A duct between the compartment air inlet and the engine blower housing may be necessary Locate the air outlet opposite the intake or at least at a 90 degree angle The area of the outlet should be at least 15 percent larger than that of the inlet Allow...

Page 10: ...low proper ventilation 2 Air discharge opening is partially blocked by external ducts or exhaust systems 3 Recirculation of heated air into fresh air inlet The vacu flo installation permits greater freedom in choice of locating the air inlet and outlet openings and permits the use of a compartment only slightly larger than the engine itself 60 The area of the air inlet must be at least TWsquare in...

Page 11: ...INE PULLEY FIGURE 3 DRIVE BELT INSTALLATION Comply with the following installation requirements 1 The shafts of the engine and the load must be parallel with each other 2 The pulleys of the engine and the load must be in alignment 3 Mount the engine pulleys as close to the engine as possible 4 If the installation permits belts should run horizontally 5 Some method of disconnecting the load for sta...

Page 12: ...d Install set screw to bottom in crankshaft hole then back it out one full turn Tighten clutch retaining screws until clutch is clamped securely to crankshaft Lock the screws and tighten the set screw Apply grease to splined power takeoff shaft Position the clutch throw out to align the grease fitting with the hole in the housing 1 cylinder side horizontal Pull the throw out collar outward to remo...

Page 13: ...aust smoke when the engine is first started is normal and is caused by inhibitor oil APPLYING LOAD When applying the load to a new or reconditioned engine it should be applied gradually in about four steps each step of not less than 30 minutes running time Start with 1 4 load then 1 2 3 4 and full load BATTERY CHARGING The battery charge rate is controlled by a charge regulator The regulator is se...

Page 14: ...batteries in a fully charged condition and maintain charge during storage RETURNING THE SET TO OPERATION 1 CHECK SERVICE IDENTIFICATION TAGS to properly service the engine 2 Uncover and remove all storage seals from engine Remove any dust dirt or foreign matter 3 CHECK fuel supply tanks for moisture ac cumulations drain tanks if necessary CHECK lubricating oil for moisture or contamination drain i...

Page 15: ...EDULE Regularly scheduled maintenance is the key to lower operating costs and longer service life for the unit The schedule Table 1 can be used as a guide However actual operating conditions under which a unit is run should be the determining factor in establishing a maintenance schedule When operating in very dusty or dirty conditions some of the service periods may have to be reduced Check the c...

Page 16: ...Figure 9 for maintaining crankcase vacuum No maintenance is generally required Should the crankcase become pressurized as evidenced by oil leaks at the seals or around the cap of the oil level indicator clean baffle in suitable solvent Clean or replace crankcase breather baffle periodically Be sure baffle material doesn t come apart and work into the manifold OIL FILTER Change the crankcase oil fi...

Page 17: ...ssure lubricants hypoid lubricants etc Maintain the proper oil level between changes Over filling will cause foaming which can lead to an oil leak due to overheating Remove the filler plug on top of the case and theoil level plug from the face of the gear case Fill the case until the oil just begins to flow from the oil level plug hole Gear box holds 1 2 pint U S measure Replace both plugs See Fig...

Page 18: ... Apply a full load to the engine and then carefully turn the main adjustment in until the speed drops slightly below normal Turn the needle out until the engine speed retums to normal Adjustment Under No Load Conditions When a T H R O T T L E STOP SCREW F U E L I D L E A D J U S T M E N T A F L O A T BOWL N U T MAIN F U E L ADJUSTMENT B FIGURE 14 CARBURETOR A D J U S T M E N T S load cannot be app...

Page 19: ...ve the choke plate screws and plate then pull out the choke shaft Carburetor Assembly and Installation Clean the components and repair or replace defective or worn parts Use acetone or alcohol to dissolve gum deposits if carburetor cleaner is not effective Soak the parts in carburetor cleaner using it asdirected by the manufacturer Clean all carbon from the car buretor bowl especially in the area ...

Page 20: ...rebuild the lower diaphragm section 7 Holding the mounting bracket press down onthe diaphragm to compress the spring under it then turn the bracket 90 degrees to unhook the diaphragm so it can be removed 8 Clean the mounting bracket with a solvent and a fine wire brush 9 Replace the diaphragm operating spring stand the new spring in the casting and position the diaphragm Press down on the diaphrag...

Page 21: ...PUMP COVER GASKET l r ro PULSATING DIAPHRAGM FUEL PUMP EXPLODED VIEW SCRIBE LINE PUMP MOUNTS ON NHC BLOWER HOUSING PUMP MOUNTS ON NHCV ENGINE REAR HOUSING FIGURE 17 PULSATING DIAPHRAGM FUEL PUMP 13 ...

Page 22: ...embling the pump fl All parts must be perfectly aligned or the pump will leak creating a fire hazard THERMO MAGNETIC CHOKE Optional This choke uses a strip heating element and a heat sensitive bimetal spring to control the choke plate position In addition to this a solenoid is actuated during engine cranking closing the choke all or part way depending on ambient temperature The bimetal is factory ...

Page 23: ...wire high resistance connections or broken lead wires to the bimetal and heater assembly With the element at room temperature check the heater resistance with an ohmmeter The resistance should be about 37 8 to 46 2 ohms for a 12 volt system If the heater is defective replace There must be slack in the lead wires between the choke body and the bimetal and heater assembly When the start button is en...

Page 24: ... adjust or replace parts as needed THIS DISTANCE DETERMINES SENSITIVITY Procedure 1 Adjust the carburetor main jet for the best fuel mixture at full load operation 2 Adjust the carburetor idle needle with no load connected 3 Adjust the length of the governor linkage 4 Check the governor linkage and throttle shaft for binding or excessive looseness 5 Adjust the governor spring tension for nominal e...

Page 25: ... use where a wide range of speed settings is desired The design of the variable speed governors give an automatic increase in sensitivity when the speed is increased and the result is good stability at all speeds To adjust the variable speed governors refer to Figure 21 and the following 1 Run the engine and make necessary carburetor adjustments 2 Adjust the throttle stop screw on thecarburetor to...

Page 26: ...tributor is eliminated Spark advance is set at 20 BTC before top center and should be maintained forbestengine performance Always check timing after replacing ignition points or if noticing poor engine perfor mance Proceed as follows Timing Procedure Engine Running 1 To accurately check the ignition timing use a timing light with engine running at idle speed Connect the timing light according to i...

Page 27: ...g on ohmmeter Place ohmmeter leads inside of spark plug cable holes Figure 26 Secondary resistance should read 14 000 10 ohms 70 F 4 If any of the above conditions are not met replace coil Refer to Parfs Catalog for correct part number C A U T I O N This engine uses a 12 volt negative ground system Alternator must be connected to battery at all times when engine is running Do not reverse battery c...

Page 28: ... tight After making connections coat the terminals with a light application of petroleum jelly or grease to retard corrosion Poor contact at the battery cable connections is often a source of trouble Make sure battery cables are in good condition and that contacting surfaces are clean and tightly connected Do not reverse battery leads Use recommended battery tools when disconnecting leads to avoid...

Page 29: ...put control has a good ground connection Mating surface for mounting must be clean and fasteners tightened properly 4 Never reverse the battery leads Charging system tests require a fully charged battery 20 AMP SYNCHRO SYSTEM The 20 amp flywheel alternator systems use a separate regulator and a separate rectifier Figure 28 Testing For testing this system use a voltmeter ohmmeter such as a Simpson ...

Page 30: ... polarity with no deflection in the other ALTERNATOR S T A T O R MOUNTED BEHIND B L O W E R W H E E L TO TERMINAL CONNECTOR RECTIFIER A S S E M B L Y REGULATOR A S S E M B L Y FIGURE 29 20 AMP SYNCHRO SYSTEM Full Charge Will Not Regulate Check for broken leads at connection to regulator plates To be sure regulator winding operates properly connect red lead to ground and start engine A maximum of 4...

Page 31: ...600 rpm 28 VAC STATOR V A C U F L O F L Y W H E E L 6 MAGNETS PRESSED INTO F L Y W H E E L NOT REMOVABLE V O L T A G E R E G U L A T O R R E C T I F I E R FIGURE 30 15 AMP SYSTEM PHELON VRI High Charging Rate Test Perform this test as follows 1 Check B to ground voltage with a DC voltmeter 2 If voltmeter reads over 14 7 volts replace regulator rectifier assembly 3 If reading is under 14 7 volts th...

Page 32: ...ed between the rear bracket and the commutator These washers are inserted so the steel washer is located in the commutator side FIGURE 34 REMOVING THROUGH BOLTS The armature can easily be removed from the front bracket Be careful not to miss a small steel washer used in the end of the armature shaft The shift lever can be removed along with the ar mature when it is removed In this case the spring ...

Page 33: ... fluid 1 Inspect brushes Figure 37 and clean all parts carefully with a dry cloth and compressed air if it is available 2 Apply 20 weight non detergent oil to the armature shaft and splines Apply grease Shell Albania No 2 or equivalent sparingly on the shift lever pin the joint of the shift lever and plunger the plunger and spacing washers at the end of the shaft 3 To mount pverrurinirig clutch fi...

Page 34: ...Testing Commutator Runout Place armature in a test bench and check runout with a dial indicator When commutator runout exceeds 004 com mutator should be refaced Figure 42 FIGURE 40 ARMATURE SHORT CIRCUIT TEST FIGURE 42 CHECKING COMMUTATOR RUNOUT 2 Testing Armature for Grounds Touch armature shaft or core and the end of each commutator bar with a pair of ohmmeter leads If the ohmmeter reading is lo...

Page 35: ... manner Figure 45 FIGURE 45 FIELD COIL OPEN CIRCUIT TEST 8 Inspection of Brushes Replace brushes when they are worn less than 3 as shown in Figure46 See that all brushes move freely in their holders rL_m_n W E A R L I M I T j 3 5 5 FIGURE 47 BRUSH SPRING TENSION TEST INSPECTION AFTER OVERHAUL 1 For no load test the starting motor is wired as shown in Figure 48 and revolved The meter readings for t...

Page 36: ... the clearance between the end of the pinion and pinion stopper when the pinion is pushed lightly toward the commutator end Clearance should be 02 to 06 Adjust for proper clearance by removing the magnetic switch attaching screws and select proper thickness of the fiber packings shown in Figure 50 B A T T E R Y FIGURE 49 BATTERY CONNECTIONS FIGURE 50 ADJUSTING PINION CLEARANCE 34 ...

Page 37: ... band should be 1 32 to 3 64 of an inch wide Grind only enough to assure proper seating Remove all grinding compound from engine parts and place each valve in its proper location Check each valve for a tight seat using an air pressure type testing tool If such a tool is not available make pencil marks at intervals across the valve face and observe if the marks rub off uniformly when the valve is r...

Page 38: ...eTC mark on the gear cover Then follow adjustment procedure given for left hand cylinder 7 Replace all parts removed Tighten all screws securely Torque manifold bolts FLYWHEEL Use a suitable puller with clawsorwith bolts to agree with flywheel to pull the flywheel Do not drop the flywheel A broken fin will destroy the balance Always use a steel key for mounting the flywheel C A U T I O N INTAKE VA...

Page 39: ...s when measuring If the distance is less the engine may race especially at no load remove the center pin and press a new pin in only the required amount Otherwise grind off the hub of the cup as required The camshaft center pin cannot be pulled outward nor removed without damage If the center pin extends out too far the cup will not hold the flyballs properly PISTON AND RINGS Whenever there is a n...

Page 40: ...ringsmaybeusedon 005 oversize pistons Rings that are 010 020 030 and 040 oversize are to be used on corresponding oversize pistons Ringsof thetapered type are usually marked fop on one side or identified in some other manner and the ring must be installed with this mark toward the closed end of the piston PISTON RING IN CYLINDER BORE ELER GAGE FIGURE 58 FITTING PISTON RINGS TO THE CYLINDER Engines...

Page 41: ... Peen with 019 diameter cast steel shot 4 Peen for 30 seconds on each crankpin fillet Undersize bearings and connecting rods are available to rework the shaft to 010 020 and 030 under size BEARINGS Removal of the camshaft or crankshaft bearings requires complete disassembly of the engine Use a press or a suitable drive plug to remove the bearings Support the casting to avoid distortion and avoid d...

Page 42: ...l the bearing flush with the block using the combination driver just used for the rear bearing Wipe off any excess Locktite around the bearing Allow at least one hour for hardening at room temperature Lubricate the front main bearing lightly with oil and insert the crankshaft With the rear bearing plate gasket in place and the rear plate bearing lubricated slide the thrust washer grooves toward cr...

Page 43: ...semblies do not use the rear oil seal The reduction gear assembly is oiled directly from the engine crankcase Referto the instructions screened on the case of the reduction gear assembly CYLINDER The cylinder wears very little in normal service If through improper lubrication or accident the cylinder wall should become scored or worn badly the cylinder may be rebored and honed to accom modate a ne...

Page 44: ...e outer sealing edges where gaskets fit The heads are made of aluminum and can be damaged by careless handling 3 Use new head gaskets and clean both the heads and the cylinder block thoroughly where the head gaskets rest 4 Place heads in position and follow head torque tightening sequence shown in Figure 65 Start out tightening all bolts to 5 ft lb then 10 ft lb etc until all bolts are torqued tb ...

Page 45: ... number or group number always use part number and description 3 Give the part number description and quantity needed ofeach item Ifan older part cannot be identified return the part prepaid to your dealer or nearest AUTHORIZED SERVICE STATION Print your name and address plainly on the package Write a letter to the same address stating the reasonfor returning the part 4 State definite shipping ins...

Page 46: ...ur Engine Model and Spec No This Parfs Key No represents parts that differ between models Unless otherwise mentioned in the description parts are interchangeable between models Right and left sides are determined by facing the blowerend front of the engine ENGINE DATA TABLE MODEL AND SPEC NO PARTS KEY NO MODEL AND SPEC NO PARTS KEY NO NHC MS A 1 NHCV MS A 3 NHC MS B 2 NHCV MS B 4 The Specification...

Page 47: ...2 9 FLYWHEEL ASSEMBLY Key 1 2 Includes Ring Gear 134 2464 1 Standard 134 2462 1 134 2467 1 10 With Magnet Ring Phelon 12 Amp Alternator With Magnet Ring Synchro 20 Amp Alternator FLYWHEEL ASSEMBLY KEY 3 4 Includes Ring Gear 134 2768 1 Standard 134 2770 1 With Magnet Ring Phelon 12 Amp Alternator 134 2769 1 With Magnet Ring Synchro 20 Amp Alternator PART DESCRIPTION Washer Flat Steel 7 16 Washer Lo...

Page 48: ... Side Screw Round Head Sheet Metal 8 x 3 4 CRANKSHAFT REAR Standard 002 Undersize 010 Undersize 020 Undersize 030 Undersize REF NO PART NO 13 104 0575 QTY USED AR PART DESCRIPTION 14 15 16 17 18 19 20 Washer Thrust Crankshaft Bearing 101 0415 1 Gasket Bearing Plate PLATE BEARING REAR 101 0439 101 0417 101 0405 509 0041 516 0072 NUT HEX 104 0091 104 0091 WASHER FLAT 526 0063 526 0250 526 0251 526 0...

Page 49: ...17 1 Seal O Ring Breather Tube 110 0068 2 Gasket Valve Guide Intaike STUD CYLINDER HEAD MOUNTING 520 0717 8 3 8 x 1 7 8 520 0773 12 3 8 x 2 5 16 BEARING SLEEVE FLANGED CRANKSHAFT 101 0432 1 Standard 101 0432 02 1 002 Undersize 101 0432 10 1 010 Undersize 101 0432 20 1 020 Undersize 101 0432 30 1 030 Undersize 104 0776 AR Shim 005 Crankshaft Thrust 160 1190 1 Pointer Timing Key 3 4 Order by descrip...

Page 50: ...88 10 4 010 Undersize 114 0188 20 4 020 Undersize 114 0188 30 4 030 Undersize 8 RING SET PISTON 113 0165 2 Standard 113 0165 05 2 005 Oversize 113 0165 10 2 010 Oversize 113 0165 20 2 020 Oversize 113 0165 30 2 030 Oversize 113 0165 40 2 040 Oversize Parts Included in Piston and Pin Set t Parts Included in Connecting Rod Assembly CAMSHAFT GROUP REF PART QTY PART NO NO USED DESCRIPTION 1 105 0382 1...

Page 51: ...ndard Key 4 150 1453 1 Special Key 2 Side Pull 103 0472 103 0447 103 0474 103 0387 103 0446 103 0475 103 0473 1 1 1 1 1 1 1 REF NO PART NO QTY PART USED DESCRIPTION 8 150 1187 1 Yoke Governor Shaft 9 815 0046 2 Screw Pan Head Steel 8 32 x 3 8 10 516 0130 1 Pin Roll 11 510 0008 1 Bearing Needle Key 1 3 12 510 0014 1 Bearing Ball EXTENSION GOVERNOR ARM 13 150 1073 1 Standard Key 1 2 Left Pull 14 150...

Page 52: ...ter Adapter Oil Filter Gasket Adapter Mounting Filter Oil Switch Low Oil Pressure Optional REF PART QTY NO NO USED 15 502 0058 1 16 193 0198 1 17 526 0065 2 18 800 0028 2 19 505 0057 1 20 193 0031 1 21 193 0068 1 22 193 0107 1 23 501 0004 1 24 502 0005 1 25 502 0020 1 26 800 0007 2 27 850 0040 2 PART DESCRIPTION Tee Low Oil Pressure Switch Optional Sender Oil Pressure Optional Washer Flat Copper 5...

Page 53: ...ew Hex Head Cap 3 8 16 x 1 1 2 Nut Hex Jam 5 16 24 Washer Lock Steel 5 16 Screw Counterbore Cap Steel 1 4 20 x 1 1 4 Screw Hex Head Cap Steel 5 16 18 x 1 Washer Lock Steel 5 16 Adapter Exhaust Manifold Gasket Exhaust Manifold Manifold Exhaust High Profile Side Outlet Optional Clamp Exhaust Pipe Manifold Exhaust High Profile Top Outlet Optional Washer Lock Steel 3 8 Bolt Place Steel 3 8 16 x 1 Nut ...

Page 54: ...Seal Felt Manual Choke Retainer Seal Manual Choke Shaft Throttle Spring Fuel Float tGasket Carburetor Flange 18 Included in Repair Kit 141 0814 t Included in Gasket Kit 141 0748 FUEL PUMP PARTS GROUP MECHANICAL TYPE 0 5 REF NO PART NO 149 1223 1 2 815 0148 3 815 0147 4 149 0096 5 149 0095 6 149 0582 7 149 0672 8 149 0539 9 149 0675 10 516 0113 11 12 149 0670 13 149 1148 14 149 1042 15 509 0065 16 ...

Page 55: ...t Carburetor Inlet 517 0009 1 Plug Button Key 1 2 800 0003 2 Screw Hex Head Cap Steel 1 4 20x1 2 REF PART QTY PART NO NO USED DESCRIPTION 15 862 0001 2 Nut Hex 1 4 16 853 0013 2 Washer Lock External Tooth Steel 1 4 17 193 0218 1 Panel Instrument Key 1 2 Optional 18 302 0885 1 Meter Time Totalizing Key 1 2 Optional 19 322 0108 2 Light Indicator Key 1 2 Optional 20 821 0010 4 Screw Locking Head Flan...

Page 56: ...oil Mounting Spark Plug Cable Electrical Spark Plug Cable Electrical Spark Plug Coil Ignition REF NO 22 PART NO QTY USED LEAD ELECTRICAL 332 0592 336 2271 336 2272 336 2273 336 0794 23 300 0140 1 24 302 0270 1 25 302 0060 1 26 812 0082 2 27 850 0025 2 28 860 0008 2 29 332 1043 1 30 332 0604 1 31 332 1273 1 32 SCREW 813 0100 2 821 0004 2 33 856 0003 2 34 301 3530 1 35 167 0188 1 36 338 0619 1 37 33...

Page 57: ...d Head Cross Recessed Steel 10 32 x 1 1 4 REF PART QTY NO NO USED 10 850 0030 3 11 191 0937 1 12 821 0004 4 13 191 0938 1 14 191 0939 1 15 821 0010 2 16 191 1060 1 17 336 2222 1 18 336 2236 1 19 323 0488 5 20 323 0496 5 21 323 0880 1 22 323 0879 1 23 323 0882 1 24 323 0881 1 PART DESCRIPTION fWasher Lock Steel 10 fStator Alternator 12 Volt 20 Amp fScrew Hex Locking Head Flanged Steel 10 32x5 16 fR...

Page 58: ...GOVERNOR GROUP STANDARD GOVERNOR CONTROLLED AT ENGINE VARIABLE S P E E D GOVERNOR C O N T R O L L E D AT ENGINE OPTIONAL VARIABLE SPEED GOVERNOR REMOTE CONTROLLED OPTIONAL 39 56 ...

Page 59: ... Cap Steel 1 4 20 x 3 4 Washer Flat Steel 1 4 Washer Spring Tension Nut Hex Steel 1 4 20 PART DESCRIPTION Screw Fillister Head Steel 10 32x5 16 Nut Hex with External Lockwasher 10 32 Bracket Control Screw Hex Head Cap Steel 1 4 20 x 1 2 Key 1 2 Washer Lock External Tooth Steel 1 4 Key 1 2 Nut Hex Steel Zinc Plate 1 4 20 Key 1 2 Remote Control Variable Speed Governor Includes Parts Marked Optional ...

Page 60: ...HOUSSMG GROUP 58 ...

Page 61: ...Right Side Carburetor Optional Key 1 2 Hood Engine Optional Kev 1 2 REF NO PART NO QTY USED PART DESCRIPTION 14 405 1872 15 818 0150 16 526 0003 17 821 06T0 18 134 2755 19 134 2752 20 134 2761 21 22 23 134 2763 134 2747 134 2737 24 517 0021 25 SCREW 809 0059 820 0010 26 870 0106 27 821 0010 28 815 0261 29 821 0010 2 Clip Hood Optional Key 1 2 4 Rivet Drive Optional Key 1 2 4 Washer Flat Optional K...

Page 62: ...on B 11 191 0752 1 Holder Spring 12 191 0753 1 Bracket Starter Rear Includes Bearing REF PART QTY PART NO NO USED DESCRIPTION 75 191 0754 1 Washer Flat 14 191 0755 1 Washer Flat 15 191 0756 1 Insulator Disc 16 191 0757 4 Brush Starter 17 191 0758 4 Spring Helical Compression Brush 18 191 0759 2 Bolt Machine Through 19 191 0760 3 Screw Machine Pan Head 20 191 0761 1 Solenoid Starter 21 191 0762 1 C...

Page 63: ...Sleeve Front Stop Retaining Set Pinion Gear Spring Helical Compression Brush REF NO PART NO QTY USED 11 191 1008 2 12 191 1009 1 13 191 1087 1 14 191 1088 1 15 191 0997 1 16 191 1005 2 17 191 1006 1 18 191 1089 1 19 850 0050 2 20 800 0051 2 PART DESCRIPTION Brush Starter Negative Bracket Starter Rear Includes Bearing Clutch Pinion Gear Starter Armature Starter Washer Insulator Set Brush Starter Po...

Page 64: ...1 Washer Lock Steel 10 7 153 0392 1 Frame Solenoid 24 812 0076 2 Screw Round Head Steel 8 153 0387 1 Spring Armature 8 32 x 5 16 9 153 0390 1 Lever Limit 25 854 0007 2 Washer Lock Internal 10 526 0018 1 Washer Flat Steel 5 8 Tooth 8 11 870 0134 1 Palnut 1 4 20 26 815 0161 2 Screw Flat Head Steel 12 153 0399 Insulator Disc 10 32 x 3 8 13 153 0400 1 Bimetal Heater Assembly 153 0429 1 Kit Replacement...

Page 65: ...142 0540 2 3 149 1323 1 4 142 0541 1 5 142 0545 1 PART DESCRIPTION Pump Fuel Valve Plate Assembly Screw Cover Gasket Base Gasket Valve Plate Spring Pump REF NO PART NO 6 149 1326 7 149 1324 8 142 0552 9 142 0555 QTY USED 1 1 1 l PART DESCRIPTION Cover Pump Base Pump Disc Pump Diaphragm Pump 63 ...

Page 66: ...e Shutoff Plug Pipe 1 8 Elbow Fuel Pump to Fuel Line 1 Cap and Gauge Assembly Fuel Tank 2 Screw Machine Round Head Cross Recessed Steel 10 32 x 1 1 2 Hold down Strap to Bracket 2 Nut Hex 10 32 P CLUTCH GROUP OPTIONAL EQUIPMENT REF NO 1 2 3 PART NO QTY USED PART DESCRIPTION 190 0171 1 Adapter Clutch to Engine 515 0196 1 Key Clutch STUD CLUTCH HOUSING TO ENGINE 520 0738 1 3 8 16 x 4 520 0739 2 3 8 1...

Page 67: ...0007 1 24 190 0306 2 25 800 0007 4 26 526 0063 4 27 805 0009 4 28 800 0028 8 29 526 0045 8 30 190 0297 1 31 190 0298 1 32 800 0026 2 33 526 0065 2 34 505 0054 2 PART DESCRIPTION Race Inner with Roller Bearings Cone Race Outer Roller Bearing Cup Vent Reducer Pipe 1 4 x 1 8 Gasket Bearing Plate to Housing Cover Screw Hex Head Cap Steel 1 4 20 x 1 Washer Flat Copper 1 4 Bolt Hex Head Steel 5 16 18 x ...

Page 68: ...ne control wiring diagrams shipped with each unit should be used for troubleshooting The following drawings are included herein Engine Control Wiring Diagram with options 67 _ Engine Control Wiring Diagram with Thermo Magnetic Choke 622 0270 68 Wiring Diagram for Flywheel Alternator Phelon 15 Amp 69 Wiring Diagram for Flywheel Alternator Synchro 20 Amp 69 f i 66 ...

Page 69: ...CTIFIER ASSY El 2 SPARK PLUG E3 SENDER OIL PRESSURE Gl ALTERNATOR M l AMMETER M2 METER O L PRESSURE SI iwiTCH START SZ SWITCH IGNITION S3 BREAKER CAP ASSEMBLY S4 SWITCH LOPKO Tl COIL IGNITION TBI Bl OCK TERMINAL STRIP MARKER VRI REGULATOR VOLTA E Wl JUMPER SEE NOTE 0 WHEN USED CAUTION REGULATOR MUST BE GROUNDED T H R O U G H MOUNTING BOLTS MOUNTED BEHIND BLOWE WHEEL VRI VOLT REG RECT A C AC B L ra...

Page 70: ... WH USED THERMO M iCv CHOKE START SWITCH oo MHLN USED STOP SWITCH MOUNTED ON BLOWER HOUSING BREAKER CAP ASSY i LOW OiL PRESSURE WHEN ENGINE CONTROL WIRING DIAGRAM WITH THERMO MAGNETIC CHOKE 622 0270 1 3 ...

Page 71: ...TOR SI 1 SIITCH START RUN OFF n Tl vm I BREAKER I CAP ASSEMBLT IGNITION C0ll 0N N REGULATOR RECTIFIER VOLTAGE MouMTto ttmm fin 3 s 4 VRI r I BTI Cl ZZ 1 1 WIRING DIAGRAM FOR FLYWHEEL ALTERNATOR SYNCRO 20 AMP 622 0382 REX PES Bl RTl _ _ tl E _ E3 Jl Ml _SI S3 Tl vei_ WI Gl PART NO na oioe I13 010T ffl I DE V R PTION I STARTER t SOLENOID LVI BATTt RV IZV _ RECTIFILR ASSY SPARK PLUG T H StNDER OIL PR...

Page 72: ...f which is supplied with each Onan Product These Onan Authorized Service Centers have trained service personnel parts stock and the necessary facilities and tools for the service and repair of Onan equipment Material Allowances Onan will allow credit or furnish free of charge to the Onan Authorized Service Station or his Approved Service Dealer all genuine Onan parts used in a warranty repair of t...

Page 73: ...e future Adequate evidence of this scheduled maintenance must be offered when applying for a warranty claim INSTALLATION Installation is extremely important and all Onan Products should be installed in accordance with the manufacturer s recommendations If the owner experiences any difficulty with such items as mounting ventilation exhaust location fuel lines wiring etc he should immediately contac...

Page 74: ...u fllMAIM 1400 73RD AVENUE N E MINNEAPOLIS MINNESOTA 55432 W I A DIVISION OF ONAN CORPORATION ...

Page 75: ... Z u o o o o o Ul l l o z l l o o 2 Z z ui z o z IAJ 3 M e t V S CN O ...

Page 76: ...d surfaces o f the engine Figure 2 The heated a i r i s directed through an a i r tight scroll which encases the flywheel fan The s c r o l l may be positioned t o discharge heated a i r i n the downward upward l e f t or right direction This i s possible because the back section o f the scroll Figure 3 has four identical holes shaped t o f i t over the end o f the starter motor The scroll outlet ...

Page 77: ...low is restricted by bends long runs screens or the exhaust pipe Exhaust pipes running inside Vacu Flo ducts should be covered with asbestos tape The safety screen used to cover vents must be 1 4 inch mesh or larger and commensurate with safety standards Provide a short canvas section between the engine air outlet and the external duct or opening to absorb vibration I f operation i n cold weather ...

Page 78: ...V INDUSTRIAL ENGINE AIR OUT FIGURE 2 AIRFLOW THROUGH VACU FLO SYSTEM SCROLL 8 1 8 9 FIGURE 3 VACU FLO SCROLL POSITIONS OIL F I L T E R 25 BTC MARK TIMING POINTER ON FLYWHEEL FIGURE 4 VACU FLO ENGINE DYNAMIC TIMING ...

Page 79: ... a t e d REF NO 5 11 PART NO 123B1117 123B1234 OIL BASE GROUP QTY USED PART DESCRIPTION Tube O i l F i l l Standard Tube O i l F i l l Units with Pulse Type Fuel Pump Optional GEAR COVER GROUP REF NO 2 3 7 PART NO 103B446 103B447 510P105 150B1436 Delete QTY USED 1 PART DESCRIPTION Standard Governor Drilled and tapped f o r Flywheel Alternator Stator Includes parts marked Manual Throttle Controlled...

Page 80: ...or System Includes Ring Gear and OIL SYSTEM Magnet Ring Optional GROUP REF NO PART NO QTY USED PART DESCRIPTION 2 120B648 1 Intake O i l Pump Includes Cup Screen and Pipe 9 122C360 1 Drain O i l F i l t e r FUEL SYSTEM G R O U P Gasoline REF N O PART N O QTY U S E D PART DESCRIPTION Delete LINE FUEL P U M P TO C A R B U R E T O R 149A1228 1 503 708 1 Delete 5 Standard Units Units with Pulse Type F...

Page 81: ...opper Fuel Pump Hole Cover Mounting Screw Hex Cap Fuel Pump Hole Cover Mounting 1 4 20 x 5 8 Pump Fuel Pulse Type Optional See Separate Group f o r Components Cap Pulse Type Fuel Pump Top Inlet Optional Clamp Pulse Type Fuel Pump Cap Optional Bracket Pulse Type Fuel Pump Mounting Optional Screw Round Head Pulse Type Fuel Pump Mounting 10 32 x 5 8 Optional Nut Hex Pulse Type Fuel Pump Mounting 10 3...

Page 82: ...142 537 J 1 Valve Plate Assembly 2 142 540 h K Screw Pump Cover 3 149 1323 1 v Gasket Base t o Diaphragm 4 142 541 1 Gasket Cover to Valve Plate 5 142 545 1 Spring Pump Diaphragm 6 149 1326 1 Cover Pump 7 149 1324 1 Base Pump 8 142 552 1 Plate Pump Spring 9 142 555 1 Diaphragm Pump FUEL PUMP PARTS GROUP Mechanical Type DELETE ENTIRE GROUP 1 ...

Page 83: ... i r Cleaner Bracket Mounting 1 4 20 x 1 2 Adapter and Bracket A i r Cleaner Mounting Elbow Carburetor A i r I n l e t Screw Sheet Metal A i r Cleaner Bracket Mounting Nut Tinnerman A i r Cleaner Bracket Mounting 3 REF NO 2 3 5 6 PART NO 150A96 150A1433 150A939 520A623 GOVERNOR GROUP QTY USED PART DESCRIPTION Stud Speed Adjustment Standard Governor Controlled Engines Bracket Speed Stud Standard Go...

Page 84: ...ete 8 Delete 9 Delete 11 Delete 12 Delete 13 Delete 14 Delete 15 Delete 16 Delete 17 SCREW SELF LOCKING Backplate Mounting 1 4 20 x 1 2 821 10 4 Backplate Mounting 1 4 20 x 1 2 821 10 5 Scroll Mounting 1 4 20 x 1 2 821 10 2 Housing Cover 1 4 20 x 1 1 2 18 Delete 19 134A2747 1 Backplate Scroll 20 134A2761 1 Scroll Air Includes Guard 21 134D2737 1 Housing Assembly A i r 22 134B2763 1 Guard Scroll ...

Page 85: ...USED 134C2770 1 19 20 191B59 821 10 1 4 12 VOLT OPTIONAL PART DESCRIPTION Flywheel Assembly Includes Ring Gear and Magnet Ring Also listed i n the crankshaft and Flywheel Group Bracket Regulator Mounting Screw Lock Head Regulator Bracket Mounting 1 0 ...

Page 86: ...pecifications 3 Dimensions and Clearances 4 Assembly Torques and Special Tools 6 Troubleshooting Chart 7 Installation 8 Operation 11 Service and Maintenance 12 Fuel System 15 Governor System 20 Ignition and Battery Charging 23 Starting System 26 Engine Disassembly 31 Parts Catalog 39 Engine Wiring Diagram 57 ...

Page 87: ...er l any p a r i w h i c h o n enaminatton nhail disclose to Onan s satisfaction to ha been defective i n material and w o r k m a n s h i p provided that such part shall he returned t o Onan s factory or one of its Authorized Service Sialions t r a n s p o r t a l i o n charges prepaid not later than one I year after the product is first placed in service Such defective part will he repaired or r...

Page 88: ...qt Oil Capacity With Filter Change 4 qt Starting Electric Ignition Battery Combustion Air cfm 3600 rpm 80 Fuel Gasoline regular grade Fuel Pump Diaphragm 4 f t lift TUNE UP SPECIFICATIONS Spark Plug Gap 025 Breaker Point Gap 020 Ignition Timing Fixed Electric Start Units 250 B T C Tappets Cold Intake 003 Exhaust 012 NOTE For gaseous fuel operation set spark plugs at 018 and ignition timing at 260 ...

Page 89: ...nce Width Valve Face Angle Valve Seat Angle Valve Interference Angle Crankshaft Main Bearing Camshaft Bear Camshaft End Camshaft L i f t Oil Pump Gear Backlash Piston to Cylinder Strut Type Measured below oil controlling ring 90 from pin Clearance Piston Pin Diameter Piston Pin in Piston Piston Ring Groove Width 0 0025 0 0025 0 004 1 662 1 375 71 79 38 42 1 5645 1 5655 1 2510 1 2520 1 569 1 570 1 ...

Page 90: ...n 0 020 Spark Plug Gap For Gasoline Fuel 0 025 Crankshaft Main Bearing Journal Standard Size 1 9992 2 0000 Main Bearing Diameter 2 0015 2 0040 Main Bearing Clearance 0 0015 0 0043 Crankshaft Rod Bearing Journal Standard Size 1 6252 1 6260 Cylinder Bore Standard Size 3 5625 3 5635 Set exhaust valve at 014 for gaseous fuel operation ...

Page 91: ...Ft Lb Cylinder Head Nuts Rear Bearing Plate 0 Connecting Rod Bolt 27 29 Flywheel Capscrew 35 40 Starter Mounting Bracket to Oil Base Screws 43 48 Gear Case Cover 8 10 Oil Pump 7 9 Other 3 8 Cylinder Block Nuts 18 23 Intake Manifold 18 20 Exhaust Manifold 10 12 SPECIAL TOOLS These tools are available from Onan to aid service and repair work Crankshaft Gear Pulling Ring 420A248 Flywheel Puller 420A1...

Page 92: ...roken Valve Spring Valve or Valve Seal Leaking Piston Rings Worn or Broken Wrong Bearing Clearance C O O L I N G S Y S T E M AIR C O O L E D P o o r A i r C i r c u l a t i o n Dirty or O i l y Cooling Fins e Blown Head Gasket C O O L I N G S Y S T E M WATER C O O L E D I Insufficient Coolant t Faulty Thermostat Worn Water Pump or Pump Seal Water Passages Restricted Defective Gaskets Blown Head Ga...

Page 93: ... will be no problem However in protecting the engine from the elements see that nothing obstructs the flow of air around the engine EXHAUST Pipe POISONOUS exhaust gas outside enclosure Use a length of flexible tubing between the engine exhaust outlet and any rigid piping to absorb engine vibration Shield the line if it passes through a com bustible wall or partition If turns are necessary use swee...

Page 94: ...ng to the following instructions and Figure 3 Provide room for the clutch adapter casting by plugging the wet holes with a 3 8 16 x 1 2 slotted headless set screw Apply sealing compound to the threads and install screw flush with the cylinder block Drill a 13 64 hole or filed slot in the crankshaft for the clutch set screw Locate center of hole 1 1 3 2 from the end and directly opposite the keyway...

Page 95: ... 2 o n the lower and one cap screw 7 16 14 x 1 3 4 on the upper 2 cylinder side Install the stud washer and nut Lubricate the two grease fittings just until grease appears BATTERY CONNECTIONS Engines with Automotive Type Separate Starter Connect the 12 volt battery positive cable to the engine start switch terminal Connect the battery negative cable to the ground point on the engine oil base Figur...

Page 96: ... about four steps each step of not less than 30 minutes running time Start with 1 4 load then 1 2 3 4 and full load BATTERY CHARGING The battery charge rate is controlled by a charge regulator The regulator is set to allow the proper rate of charge at operating speed STOPPING THE ENGINE Disconnect all load before stopping the engine Engines equipped with battery ignition are stopped by the igni ti...

Page 97: ...the proper service time periods can be established When any abnormalities occur in operation unusual noises from engine or accessories loss of power overheating etc contact your Onan dealer CRANKCASE OIL The oil capacity is 3 1 2 U S quarts 4 with filter F i l l to the F U L L mark on the o i l level indicator Use a good quality detergent o i l with the API American Petroleum Institute designation...

Page 98: ...e the filter by turning counterclockwise using a filter wrench Add the strip provided with the filter to prevent air loss in the area indicated It is advisable to wipe dry the drip pan located below the filter Coat rubber gasket on filter with a film of oil before installing Install the filter finger tight plus 1 4 to 1 2 turn If oil becomes so dirty that the markings on the oil level indicator ca...

Page 99: ...de Repeat this procedure every six months there after or every lOOhours Maintain the proper oil level between changes Over filling will cause foaming which can lead to an oil leak due to overheating Remove the filler plug on top of the case and the oil level plug from the face of the gear case Fill the case until the oil just begins to flow from the oil level plug hole Gear box holds 1 2 pint U S ...

Page 100: ...justment screw for even operation so the engine is firing on both cylinders and is running smoothly 4 Release the governor mechanism to allow the engine to accelerate If the engine accelerates evenly and without a lag the main adjustment is correct If not adjust the needle outward about 1 4 turn and again slow down the engine and release the mechanism Continue until the engine accelerates evenly a...

Page 101: ...ted to the carburetor body If the plate is marked with the letter C install it with the mark on the side toward the idle port when viewed from the flange end of the carburetor To center the plate back off the top screw close the throttle lever and then set the plate by tapping it with a small screw driver Install the choke shaft and plate Center the plate in the same manner as the throttle plate s...

Page 102: ...he valve springs valves and valve retainer gasket 4 Clean the pump body thoroughly with a solvent and a fine wire brush 5 Holding the pump cover with the diaphragm surface up place the new valve gasket in the cavity Assemble the valves in the cavity Reassemble valve retainer Lock in position by inserting and tightening the fuel pump retainer screw 6 Place the pump body assembly in a clean work are...

Page 103: ...en heater wire high resistance cpnnections or broken lead wires to the bimetal and heater assem bly With the element at room temperature check the heater resistance with an ohmmeter The resistance should be about 37 8 to 46 2 ohms for a 12 volt system If the heater is defective replace There must be slack in the lead wires between the choke body and the bimetal and heater assembly When the start b...

Page 104: ...nstall test hole plug in regulator Open gas supply line valve See that vent fitting is installed 5 With a clamp on each end secure the hose between the regulator outlet nipple and the carburetor inlet 6 Operate the engine to assure quick starting results Gas Carburetor Adjustment 1 Adjust the main gas adjusting screw on the carbu retor depending upon the type of gas used For 800 BTU gas turn to ap...

Page 105: ...ondition at any point will cause the governor to act slowly and regulation will be poor Excessive looseness will cause a hunting condition and regulation will be erratic Work the arm back and forth several times by hand while the engine is idle If either of these conditions exist determine the cause and adjust or replace parts as needed Procedure 1 Adjust the carburetor main jet for the best fuel ...

Page 106: ... full load should be not less than 100 rpm Check the engine speed with no load connected and again after connecting full load Do not exceed 4000rpm at no load The sensitivity of the governor depends upon the position of the arm end of the governor spring A series of holes in the governor arm provides for adjustment To increase sensitivity move the spring toward the gover nor shaft To decrease sens...

Page 107: ... approximately 1500 rpm or the desired low speed at no load by turning the knob as required 4 Adjust the sensitivity while operating at minimum speed to attain the smoothest no load to full load operation as follows To decrease sensitivity allow more speed drop from no load to full load operation move the governor spring outward into a different groove or hole in the extension arm To increase sens...

Page 108: ... To accurately check the ignition timing use a timing light with engine running at idle speed Con nect the timing light according to its manufacturer s instructions Either spark plug can be used as they fire simultaneously 2 Start the engine and check the timing The pointer on the flywheel should line up with the 2 5 mark on the cover The timing hole through the flywheel and the timing marks on th...

Page 109: ...The specific gravity reading should be approximately 1 280 at 8 0 0 F If one or more cells are low on water add distilled water and recharge Keep the battery case clean and dry An accumulation of moisture will lead to a more rapid discharge and battery failure Keep the battery terminals clean and tight After making connections coat the terminals with a light application of petroleum jelly or greas...

Page 110: ... Test Perform as follows 1 Check the E to ground voltage using a DC voltmeter 2 If voltmeter reads 13 8volts or higher add a load to system e g headlights to reduce battery voltage to below 13 6 volts 3 Observe ammeter If charge rate increases consi der the system as satisfactory If charge rate does not increase proceed with testing 4 Disconnect plug from regulator rectifier and test the AC voltag...

Page 111: ...utator NOTE These washers are inserted so the steel washer is located in the commutator side FIGURE 28 REMOVING THROUGH BOLTS 3 The armature can easily be removed from the front bracket Be careful not to miss a small steel washer used in the end of the armature shaft The shift lever can be removed along with the armature when it is removed In this case the spring holder lever springs and retainer ...

Page 112: ...y any parts that have come into contact with the cleaning fluid 2 Apply 20 weight non detergent oil to the armature shaft and splines Apply grease Shell Albania No 2 or equivalent sparingly on the shift lever pin the joint of the shift lever and plunger the plunger and spacing washers at the end of the shaft 3 To mount the overrunning clutch first insert the pinion stopper into the armature shaft ...

Page 113: ...o occur is at the commutator riser bars Inspect the points where the conductors are joined to the commutator bars for loose connections 4 Testing Commutator Runout Place armature in a test bench and check runout with a dial indicator When commutator runout exceeds 004 commuta tor should be refaced Figure 36 FIGURE 36 CHECKING COMMUTATOR RUNOUT 5 Testing Armature Shaft Runout The armature shaft as ...

Page 114: ...han 3 as shown in Figure 40 See that all brushes move freely in their holders FIGURE 41 BRUSH SPRING TENSION TEST INSPECTION AFTER OVERHAUL 1 For no load test the starting motor is wired as shown in Figure 42 and revolved The value of the meter reading at this condition should be as follows Voltage 11 5 volt Speed 3700rpm minimum Current Draw 60 amp maximum NOTE The conductor for this test should ...

Page 115: ...stop In this state measure the clearance between the end of the pinion and pinion stopper when the pinion is pushed lightly toward the com mutator end Clearance should be 02 to 06 Adjust for proper clearance by removing the magnetic switch attaching screws and select proper thickness of the fiber packings shown in Figure 44 FIGUREi 43 BATTERY CONNECTIONS FIGURE 44 ADJUSTING PINION CLEARANCES 30 ...

Page 116: ...o assure proper seating Remove all grinding compound from engine parts and place each valve in its proper location Check each valve for a tight seat using an air pressure type test ing tool If such a tool is not available make pencil marks at intervals across the valve face and observe if the marks rub off uniformly when the valve is rotated part of a turn against the seat Tappets are also replace...

Page 117: ... ances For each valve the gauge should just pass between the valve stem and valve tappet 5 To correct the valve clearance turn the adjusting screw as needed to obtain the right clearance The screw is self locking 6 To adjust valves on the right hand cylinder turn engine one complete revolution and again line up mark on the flywheel and the TC mark on the gear cover Then follow adjustment procedure...

Page 118: ... or otherwise damaged remove the spacer by spjittingjyith a chisel Replace the spacer with a new one The governor cup must spin freely on the camshaft center pin without excessive looseness or wobble If the race surface of the cup is grooved or rough replace it with a new one When installing the governor cup tilt the engine so the gear is up put the flyballs in place and install the cup and snap r...

Page 119: ...ct Figure 51 C Y L I N D E R W A L L I M P R O P E R R I N G C O N T A C T FIGURE 5 1 NEW RING IN WORN RING GROOVE Replace pistons showing signs of bad scoring or burring excessive skirt clearance wavy or worn ring lands fractures or damage from detonation Replace piston pins showing fractures scored bores or bores out of round more than 0 002 Use a new piston pin to check the pin bushing in the c...

Page 120: ...ersize bearing insert available Whenever making major repairs on the engine always inspect the drilled passages of the crankshaft Clean them to remove any foreign material and to assure proper lubrication of the connecting rods Crankshaft Regrinding Crankshaft grinding requires a trained experienced operator with precision equip ment Onan emphasizes that if facilities or trained personnel are not ...

Page 121: ...nished in the bearing kit Use the towelette in the package to clean the outside of the bearing and the bearing bore in the block N O T E Do not add additional thrust washer when replac ing front bearin F R O N T M A I N B E A R I N G B O R E A L I G N B E A R I N G N O T C H E S W I T H L O C K P I N S A N D M A T C H O I L H O L E S F R O N T M A I N B E A R I N G P R E C I S I O N T Y P E D O N ...

Page 122: ... the reduction gear assembly CYLINDER The cylinder wears very little in normal service If through improper lubrication or accident the cylinder wall should become scored or worn badly the cylinder may be rebored and honed to accommodate a new piston and ring set of the available oversizes Pistons are available in 005 010 020 030 and 040 oversize Piston rings are available in 010 020 030 and 040 ov...

Page 123: ...for cleaning at least every 400hours or when poor engine performance is noticed 1 Use a 1 2 inch socket wrench to remove cylinder head bolts L i f t heads off v D o not remove heads when they y v s i are hot Warpage may occur 2 After removing heads clean out all carbon de posits Be careful not to damage the outer sealing edges where gaskets f i t The heads are made of aluminum and can be damaged b...

Page 124: ...ff o a a e o o s a BXLTIRBME TiBMRERATiUR S SERVJC EBMANUAO BATlTiE RY ma For handy reference insert YOUR engine nameplate information in the spaces above 2 Do not order by reference number or group number always use part number and description 3 Give the part number description and quantity needed of each item If an older part cannot be identified return the part prepaid to your dealer or nearest...

Page 125: ...a l v e Cover I 0 I C 4 0 7 i Engines Without Reduction Gear 7 517 48 1 P l u g Camshaft Expansion Assembly 8 520A736 5 Stud Rear Bearing Plate Mounting I 0 I B 4 I 7 1 Engines With Reduction Gear Assembly 9 1 IOC 1 731 2 G a s k e t Cylinder Head 16 101B405 B e a r i n g Camshaft Precision 10 H E A D C Y L I N D E R 17 509A4I i Seal Bearing Plate 1 I 0 B I 9 I 2 1 Right Side 2 18 516A72 4 P i n M...

Page 126: ...806 27 2 C y l i n d e r B l o c k 3 8 16 x 3 4 I 2 3 A 9 5 I I Clamp Breather Tube Cap I23A958 I Screen Breather Tube 509 117 I Seal O Ring Breather Tube I I 0 A 6 8 2 G a s k e t V a l v e Guide Intake S T U D C Y L I N D E R H E A D M O U N T I N G 5 2 0 A 7 I 7 8 3 8 x 1 7 8 520A773 12 3 8 x 2 5 1 6 B E A R I N G C R A N K S H A F T F R O N T I 0 I K 4 3 2 I Standard I 0 I K 4 3 2 0 2 I 0 0 2 ...

Page 127: ... Models I B e a r i n g Governor Shaft Upper I Shaft A r m Governor 1 Y o k e Governor Shaft 2 Screw Y o k e Mounting I P i n Governor Cup Stop In Gear Cover B e a r i n g Governor Shaft Lower B a l l Bearing Governor Shaft E x t e n s i o n Governor Arm S e a l O i l Gasket Gear Cover Seal Gear Cover P i n Gear Cover 5 16 x 1 1 8 Gear Cover Mounting 5 16 18 x 1 3 4 800 34 I Gear Cover Mounting 5 ...

Page 128: ...ck Crankshaft Gear Washer R E F NO P A R T NO 8 9 10 I I 12 13 14 F L Y W H E E L I34B2530 I34C2462 526 18 526A 26 2 850 55 I 0 4 A I 7 0 I34C673 I34B2433 821 10 Q T Y USED ASSEMBLY P A R T D E S C R I P T I O N Standard Units Includes Ring Gear Units w i t h F l y w h e e l Alternator System Includes Ring Gear and Magnet Ring Optional Washer Flat Guard Mounting Washer Flywheel Mounting Washer L o...

Page 129: ... s i z e 1 I4B188 20 4 0 2 0 U n d e r s i z e 1 I4B188 30 4 0 3 0 U n d e r s i z e R I N G S E T PISTON 1 I 3 A I 6 5 2 Standard 113A165 05 2 0 0 5 O v e r s i z e 1 I 3 A I 6 5 I 0 2 0 1 0 O v e r s i z e 113AI65 20 2 0 2 0 O v e r s i z e 1 I 3 A I 6 5 3 0 2 0 3 0 O v e r s i z e 1 I 3 A I 6 5 4 0 2 0 4 0 Oversize C A M S H A F T G R O U P REF PART QTY PART NO NO USED DESCRIPTION 1 CAMSHAFT I0...

Page 130: ...ilter 12 I 2 2 A 3 2 I 1 Gasket Adapter 13 I22B323 1 F i l t e r O i l 45 R E F P A R T NO NO 14 3 0 9 A I 0 15 502 58 16 193 108 17 526 65 18 SCREW h 800 28 800 7 19 850 40 20 505 57 21 193A68 22 193 107 23 5 0 I A 4 24 502 5 25 502 20 Q T Y U S E D P A R T D E S C R I P T I O N S w i t c h L o w Oil Pressure Optional T e e L o w O i l Pressure Switch Optional Sender O i l Pressure Optional Washe...

Page 131: ... a s k e t Fuel Pump Mounting 14 153 263 1 Bracket Clamp Manual Choke Optional 15 800A538 4 Screw 3 8 16 x 1 1 2 Intake Manifold Mounting 16 868 2 2 Nut Hex Jam Carburetor Mounting 17 854 17 2 Washer Shakeproof Carburetor Mounting 18 806 9 2 Screw Fuel Pump Mounting 19 8 0 0 P 5 I 2 4 Screw 5 16 18 x 1 Exhaust Adapter Mounting 20 850 45 4 Washer L o c k 5 1 6 21 154 B 1484 2 Adapter Exhaust Manifo...

Page 132: ...t A s s e m b l y Jet A s s e m b l y Main A d j u s t a b l e Manual Choke Units E l e c t r i c Choke Units Washer Choke Shaft Manual Choke Units A S e a l Felt Manual Choke Units Retainer F e l t Seal Manual Choke Units Shaft Lever T h r o t t l e Spring Float Parts Contained in Repair K i t A Parts Contained in Gasket K i t F U E L PUMP P A R T S G R O U P R E F NO I 2 3 4 5 6 7 8 9 10 I I 12 ...

Page 133: ...0 I Lever Thermostat 10 526 18 I Washer 1 7 6 4 I D x 5 8 O D x 1 1 6 I I 870 134 I Palnut 1 4 20 12 I53A399 2 Insulator 13 I 5 3 B 4 0 0 I Heater Assembly 14 518 129 I Ring Retaining R E F P A R T Q T Y P A R T NO NO U S E D D E S C R I P T I O N T e r m i n a l Ground Choke to Ground Choke Solenoid Ground Washer Shakeproof 5 1 6 Washer Flat Nut Hex 5 16 18 Screw 10 32 x 1 1 4 Choke Body to Mount...

Page 134: ...Adapter to Carburetor 6 145A3 98 1 Adapter Carburetor A i r Inlet 7 503A582 1 Hose Breather 8 503 170 Clamp Breather Hose 9 503 P365 1 Clamp Hose Air Cleaner 10 I 4 0 A I 185 I Gasket Air Cleaner 1 1 815 199 3 Screw 10 32 x 5 1 6 Adapter Mounting 12 850 30 3 Washer L o c k 10 13 821 10 4 Screw 1 4 20 x 1 2 Air Cleaner Panel Mounting 14 1936218 1 Panel Instrument Optional 15 800 3 2 ScreW 1 4 20 x ...

Page 135: ...park Plug L e f t S i d e P l u g Spark Box Breaker I n c l u d e s Parts Marked O R i n g Spark P l u g Cables Clamp C o i l Mounting S w i t c h T o g g l e Ignition Start On Off Optional R E F P A R T Q T Y NO NO U S E D 15 302A60 1 16 336A2I32 1 17 815 358 18 850 25 1 19 870 221 1 20 815 373 21 821 10 1 22 815 46 1 P A R T D E S C R I P T I O N Ammeter DC 20 0 20 Optional L e a d Assembly Poin...

Page 136: ...i n t Ball A l l Governor Controlled Engines L i n k T h r o t t l e A l l Governor Controlled Engines Palnut L o c k i n g A l l Governor Controlled Engines Bracket Variable Speed Control Optional Lever Variable Speed Control Optional Nut Keps A l l Governor Controlled Engines Washer V a r i a b l e Speed Lever T e n s i o n Optional Stud V a r i a b l e Speed Adjustment Optional Nut Variable Spe...

Page 137: ...B L O W E R H O U S I N G G R O U P 12 13 18 1 7 52 ...

Page 138: ...ort Mounting 12 4 0 5 A I 9 3 5 1 Hood A s s e m b l y Engine Include Parts Marked O p t i o n a l 13 4 0 5 B I 9 3 4 1 H o o d Engine 14 4 0 5 A I 8 7 2 2 C l i p Hood 15 818 150 4 R i v e t Drive 16 526 3 4 Washer Flat 17 821 10 2 Screw 1 4 20 x 1 2 Hood Mounting 18 870P258 2 Stud 1 4 20 Hood Mounting Included in Engine Hood A s s e m b l y S I D E M O U N T E D F U E L T A N K G R O U P O P T I...

Page 139: ... Holder Spring 12 191 753 1 Bracket A s s e m b l y Rear 13 191 754 1 Washer P l a i n 14 191 755 1 Washer Plain R E F P A R T Q T Y P A R T NO NO U S E D D E S C R I P T I O N 15 191 756 1 Washer Insulator 16 191 757 4 Brush 17 191 758 4 Spring Brush 18 191 759 2 B o l t Through 19 191 760 3 Screw Machine P H 20 191 761 1 Switch A s s e m b l y Solenoid 21 191 762 1 C o i l Assembly F i e l d 22 ...

Page 140: ...ing 22 5 I 8 P I 7 2 1 Vent 4 I90A20 1 Gasket Housing to Engine 23 505 7 1 B u s h i n g Reducer 1 4 x 1 8 5 I 9 0 B 2 I 1 Gasket Cover to Housing 23A 505 54 2 P l u g Pipe 1 4 6 I 9 0 B I 6 1 Plate Bearing Retainer 24 I9PA306 2 Gasket Bearing Plate to 7 I 9 0 A I 1 5 1 Shim Set End Play Adjustment 1 Each 0 0 5 0 0 9 0 1 2 Housing Shim Set End Play Adjustment 1 Each 0 0 5 0 0 9 0 1 2 25 800 7 4 Sc...

Page 141: ...asher L o c k 10 6 821 18 2 Screw 1 4 2 0 x 3 4 16 I 6 7 A I 8 8 1 C l i p Regulator Harness Regulator Mounting 17 3 3 8 A 6 I 9 1 Harness Wiring Start Solenoid 7 3 0 I B 3 5 3 0 1 Bracket T e r m i n a l Block to Terminal B l o c k 8 3 3 2 A I 2 7 3 1 Strip Marker 18 3 3 6 A 2 I 3 2 1 Lead Assembly Terminal Bloci 9 332A604 1 Block T e r m i n a l 5 Place to Coil 10 3 3 2 C I 0 4 3 1 Jumper T e r ...

Page 142: ...M2 1 METER OIL PR ESS URE SI 1 SWITCH START S2 1 SWITCH IGNITION S3 1 BREAKER i CAP ASSEMBLY S 4 1 SWITCH LOPKO Tl 1 COIL IGNITION TBI 1 BLOCK TERMINAL STRIP MAR KF R VRI 1 REGULATOR VOLTAGE Wl 1 JUMPER S E E NOTE l WHEN USED _ CAUTION RES 1 4 REGULATOR MUST BE GROUNDED THROUGH MOUNTING BOLTS NOTE I REMOVE JUMPER Wl WHEN AMMETER Ml IS USED ENGINE WIRING DIAGRAM INCLUDES F L Y W H E E L ALTERNATOR ...

Page 143: ...zed Parts and Service Centers is provided in our brochure F 115 a copy of which is supplied with each Onan Product These Onan Authorized Service Centers have trained service personnel parts stock and the necessary facilities and tools for the service and repair of Onan equipment Material Allowances Onan will allow credit or furnish free of charge to the Onan Authorized Service Station or his Appro...

Page 144: ...nd costly repairs in the future Adequate evidence of this scheduled maintenance must be offered when applying for a warranty claim INSTALLATION Installation is extremely important and all Onan Products should be installed in accordance with the manufacturer s recommendations If the owner experiences any difficulty with such items as mounting ventilation exhaust location fuel lines wiring etc he sh...

Page 145: ...O N A N1400 73RD AVENUE N E MINNEAPOLIS MINNESOTA 55432 A DIVISION OF ONAN CORPORATION ...

Page 146: ...ATOR S SERVICE MANUAL AND PARTS CATALOG FOR SERIES N H C INDUSTRIAL ENGINES St A 1400 73RD AVENUE N E MINNEAPOLIS M I N N E S O T A 55432 A DIVISION OF ONAN CORPORATION 9 A 7 2 Printed in U S A 9 4 0 4 0 4 ...

Page 147: ...mensions and Clearances 4 Assembly Torques and Special Tools 6 Troubleshooting Chart 7 I n s t a l l a t i o n 8 Operation 11 Seryice ond Maintenance 12 S f s F S s j e m 15 Governor System 2Q Ignition and Battery Charging 23 Starting System 26 Engine Disassembly 31 F b r t s X r o g T T T T 3 Engine Wiring Diagram 57 ...

Page 148: ...art is included Study and follow the instructions carefully Proper service and maintenance will result in longer engine life and better performance How To Interpret MODEL and SPEC NO NHC MS 123 A 1 3 4 1 Factory code for general identification purposes 2 Specific Type S MANUAL starting with stub shaft power take off MS ELECTRIC starting with stub shaft starter and generator 3 Factory code for opti...

Page 149: ... Capacity With Filter Change 4 qt Starting Electric Ignition B a t t e r y Combustion Air cfm 3600 rpm 8 0 Fuel Gasoline regular grade Fuel Pump Diaphragm 4 ft lift TUNE UP SPECIFICATIONS Spark Plug Gap 0 2 5 Breaker Point Gap 020 Ignition Timing Fixed Electric Start Units 250 BTC Tappets Cold Intake O 0 3 Exhaust 012 NOTE For gaseous fuel operation set spark plugs at 018 and ignition timing at 26...

Page 150: ...ve Interference Angle Camshaft L i f t Piston to Cylinder Strut Type Measured below oil controlling ring 90 from oin Clearance Piston Pin in Piston Piston Pin in Rod Piston Ring Groove Width 0 001 0 0025 0 0025 0 004 1 662 71 79 38 42 1 5645 1 5655 1 2510 1 2520 1 569 1 570 1 255 1 256 0 3430 0 3410 0 3415 0 346 0 7575 0 7480 0 7505 0 7515 1 32 3 64 440 45 1 0 0025 0 0038 0 005 0 009 0 0015 0 003 ...

Page 151: ... Gap Full Separation Spark Plug Gap For Gasoline Fuel u u Crankshaft Main Bearing Journal Standard Size l WW 2 0040 Main Bearing Diameter y y v Main Bearing Clearance fi9f n Crankshaft Rod Bearing Journal Standard Size 1 Cylinder Bore Standard Size i M S J aooo Set exhaust valve at 014 for gaseous fuel operation ...

Page 152: ...t Lb Cylinder Head Nuts 17 19 Rear Bearing Plate 20 Connecting Rod Bolt 27 29 Flywheel Capscrew 30 35 Starter Mounting Bracket to Oil Base Screws 43 48 Gear Case Cover 8 10 Oil Pump 7 9 Other 3 8 Cylinder Block Nuts 18 23 Intake Manifold 18 20 Exhaust Manifold 10 12 SPECIAL TOOLS These tools are available from Onan to aid service and repair work Crankshaft Gear Pulling Ring 420A248 Flywheel Puller...

Page 153: ...efective Fuel Pump I N T E R N A L ENGINE Wrong Valve Clearance Broken Valve Spring Valve or Valve Seal Leaking Piston Rings Worn or Broken Wrong Bearing Clearance Hi COOLING SYSTEM AIR C O O L E D Poor Air Circulation Dirty or Oily Cooling Fins Blown Head Gasket COOLING SYSTEM WATER C O O L E D Insufficient Coolant ft Faulty Thermostat Worn Water Pump or Pumo Seal Water Passages Restricted Blow i...

Page 154: ...will be no problem However in protecting the engine from the elements see that nothing obstructs the flow of air around the engine EXHAUST Pipe POISONOUS exhaust gas outside enclosure Use a length of flexible tubing between the engine exhaust outlet and any rigid piping to absorb engine vibration Shield the line if it passes through a com bustible wall or partition If turns are necessary use sweep...

Page 155: ...h accord ing to the following instructions and Figure 3 Provide room for the clutch adapter casting by plugging the wet holes with a 3 8 16 x 1 2 slotted headless set screw Apply sealing compound to the threads and install screw flush with the cylinder block Drill a 13 64 hole or filed slot in the crankshaft for the clutch set screw Locate center of hole 1 1 3 2 from the end and directly opposite ...

Page 156: ...ws 7 16 14 x 2 o n the lower and one cap screw 7 16 14 x 1 3 4 on the upper 2 cylinder side Install the stud washer and nut Lubricate the two grease fittings jmst until grease appears B A T T E R Y A CONNECTIONS Engines with Automotive T y p e Srep GfSre Starter Connect the I t Z l t J b a r j positive cable to the engine startf switch terminal Connect thet jSSnegative cable to the ground point on...

Page 157: ...bout four steps each step of not less than 30 minutes running time Start with 1 4 load then 1 2 3 4 and full load BATTERY CHARGING The battery charge rate is controlled by a charge regulator The regulator is set to allow the proper rate of charge at operating speed STOPPING THE ENGINE Disconnect all load before stopping the engine Engines equipped with battery ignition are stopped by the igni tion...

Page 158: ...until the proper service time periods can be established When any abnormalities occur in operation unusual noises from engine or accessories loss of power overheating etc contact your Onan dealer CRANKCASE OIL The oil capacity is 3 1 2 U S quarts 4 with filter Fill to the F U L L mark on the oil level indicator Use a good quality detergent oil with the API American Petroleum Institute designation ...

Page 159: ...dvisable to wipe dry the drip pan located below the filter Coat rubber gasket on filter with a film of oil before installing Install the filter finger tight plus 1 4 to 1 2 turn If oil becomes so dirty that the markings on the oil level indicator cannot be seen change thp filter arid shorten the filter service period X OIL FILTER RIP PAN CRANKCASEBREATHER The engine is equipped with a baill check ...

Page 160: ...ery six months there after or every lOOhours Use only SAE50 motor oil or SAE90 mineral gear oil Do not use lubricants commonly known as extreme pressure lubricants hypoide lubricants etc Maintain the proper oil level between changes Over filling will cause foaming which can lead to an oil leak due to overheating Remove the filler plug on top of the case and the oil level plug from the face of the ...

Page 161: ...tment screw for even operation so the engine is firing on both cylinders and is running smoothly 4 Release the governor mechanism to allow the engine to accelerate If the engine accelerates evenly and without a lag the main adjustment is correct If not adjust the needle outward about 1 4 turn and again slow down the engine and release the mechanism Continue until the engine accelerates evenly and ...

Page 162: ...dy If the plate is marked with the letter C install it with the mark on the side toward the idle port when viewed from the flange end of the carburetor To center the plate back off the top screw close the throttle lever and then set the plate by tapping it with a small screw driver 2 Install the choke shaft and plate Center the plate in the same manner as the throttle plate see step above Use new ...

Page 163: ...ve retainer gasket 4 Clean the pump body thoroughly with a solvent and a fine wire brush 5 Holding the pump cover with the diaphragm surface up place the new valve gasket in the cavity Assemble the valves in the cavity Reassemble valve retainer Lock in position by inserting and tightening the fuel pump retainer screw 6 Place the pump body assembly in a clean work area and rebuild the lower diaphra...

Page 164: ...sistance connections or broken lead wires to the bimetal and heater assem bly With the element at room temperature check the heater resistance with an ohmmeter The resistance should be about 37 8 to 46 2 ohms for a 12 volt system If the heater is defective replace There must be slack in the lead wires between the choke body and the bimetal and heater assembly When the start button is engaged the s...

Page 165: ...gas supply line Install test hole plug in regulator Open gas supply line valve See that vent fitting is installed 5 With a clamp on each end secure the hose between the regulator outlet nipple and the carburetor inlet 6 Operate the engine to assure quick starting results Gas Carburetor Adjustment 1 Adjust the main gas adjusting screw on the carburetor depending upon the type of gas used For 800 BT...

Page 166: ...t any point will cause the governor to act slowly and regulation will be poor Excessive looseness will cause a hunting condition and regulation will be erratic Work the arm back and forth several times by hand while the engine is idle If either of these conditions exist determine the cause and adjust or replace parts as needed P r o c e d u r e 1 Adjust the carburetor main jet for the best fuel mi...

Page 167: ...o full load should be not less than 100 rpm Check the engine speed with no load connected and again after connecting full load Do not exceed 4000 rpm at no load The sensitivity of the governor depends upon the position of the arm end of the governor spring A series of holes in the governor arm provides for adjustment To increase sensitivity move the spring toward the gover nor shaft To decrease se...

Page 168: ...to approximately 1500 rpm or thp desired low speed at no load by turning the knob as required 4 Adjus the sensitivity while operating at minimum speed to attain the smoothest no load to full load operation as follows To decrease sensitivity allow more speed drop from no load to full load operation move the governor spring outward into a different groove or hole in the extension arm To increase sen...

Page 169: ...eliminated Spark advance is gej at 2 5 0 B T C before top center and should be maintained for best engine performance Always check timing after replacing ignition points or if noticing poor engine performance Proceed as follows Timing Procedury Engine Running 1 To gFrnratelv check the ignition timing use a timing light with engine running at idle speed Con nect the timing light according to its ma...

Page 170: ...r The specific gravity reading should be approximately 1 280 at 80 0 F If one or more cells are low on water add distilled water and recharge Keep the battery case clean and dry An accumulation of moisture will lead to a more rapid discharge and battery failure Keep the battery terminals clean and tight After making connections coat the terminals with a light application of petroleum jelly or grea...

Page 171: ...HARGE RATE TEST procedure No Charge Test Perform as follows 1 Check the B to ground voltage using a DC voltmeter 2 If voltmeter reads 13 8volts or higher add a load to system e g headlights to reduce battery voltage to below 13 6 volts 3 Observe ammeter If charge rate increases consi der the system as satisfactory If charge rate does not increase proceed with testing 4 Disconnect plug from regulat...

Page 172: ...commutator NOTE These washers are inserted so the steel washer is located in the commutator side FIGURE 28 REMOVING THROUGH BOLTS 3 The armature can easily be removed from the front bracket Be careful not to miss a small steel washer used in the end of the armature shaft The shift lever can be removed along with the armature when it is removed In this case the spring holder lever springs and retai...

Page 173: ...ny parts that have come into contact with the cleaning fluid 2 Apply 20 weight non detergent oil to the armature shaft and splines Apply grease Shell Albania No 2 or equivalent sparingly on the shift lever r i pin the joint of the shift lever and plunger the plunger and spacing washers dt the end of the shaft 3 To mount the overrunning clutch first insert the pinion stopper into the armature shaft...

Page 174: ...o occur is at the commutator riser bars Inspect the points where the conductors are joined to the commutator bars for loose connections 4 Testing Commutator Runout Place armature in a test bench and check runout with a dial indicator When commutator runout exceeds 004 commuta tor should be refaced Figure 36 FIGURE 36 CHECKING COMMUTATOR RUNOUT 5 Testing Armature Shaft Runout The armature shaft as ...

Page 175: ...from the brushholder On a new brush the spring tension should be 29 0 38 ounces FIGURE 41 BRUSH SPRING TENSION TEST INSPECTION AFTER OVERHAUL 1 For no load test the starting motor is wired as shown in Figure 42 and revolved The value of the meter reading at this condition should be as follows Voltage 11 5 volt Speed 3700 rpm minimum Current Draw 60 amp maximum NOTE The conductor for this test shou...

Page 176: ... state measure the clearance between the end of the pinion and pinion stopper when the pinion is pushed lightly toward the com mutator end Clearance should be 02 to 06 Adjust for proper clearance by removing the magnetic switch attaching screws and select proper thickness of the fiber packings shown in Figure 44 FIGURE 43 BATTERY CONNECTIONS FIGURE 44 ADJUSTING PINION CLEARANCE 30 ...

Page 177: ...ound from engine parts and place each valve in its proper location Check each valve for a tight seat using an air pressure type test ing tool If such a tool is not available make pencil marks at intervals across the valye face and observe if the marks riib off uniformly when the valve is rotated part of a turn against the seat Tappets are also replaceable from the valve chamber after first removin...

Page 178: ... valve stem and valve tappet 5 To correct the valve clearance turn the adjusting screw as needed to obtain the right clearance The screw is self locking JTo adjust valves on the right hand cylinder turn engine one complete revolution and again line up mark on the flywheel and the TC mark on the gear cover Then follow adjustment procedure given for left hand cylinder 7 Replace all parts removed Tig...

Page 179: ...g Remove all grinding compound from engine parts and place each valve in its proper location Check each valve for a tight seat using an air pressure type test ing tool If such a tool is not available make pencil marks at intervals across the valye face and observe if the marks rub off uniformly when the valve is rotated part of a turn against the seat Tappets are also replaceable from the valve ch...

Page 180: ...ear ances For each valve the gauge should just pass between the valve stem and valve tappet 5 To correct the valve clearance turn the adjusting screw as needed to obtain the right clearance The screw is self locking j r o a d j u s t valves on the right hand cylinder turn engine one complete revolution and again line up mark on the flywheel and the TC mark on the gear cover Then follow adjustment ...

Page 181: ...ll spacer are worn or otherwise damaged remove the spacer by splitting with a chisel Replace the spacer with a new one The governor cup must spin freely on the camshaft center pin without excessive looseness or wobble If the race surface of the cup is grooved or rough replace it with a new one When installing the governor cup tilt the engine so the gear is up put the flyballs in place and install ...

Page 182: ... good cylinder wall contact Figure 51 C Y L I N D E R W A L L FIGURE 51 NEW RING IN WORN RING GROOVE Replace pistons showing signs of bad scoring or burring excessive skirt clearance wavy or worn ring lands fractures or damage from detonation Replace piston pins showing fractures scored bores or bores out of round more than 0 002 Use a new piston pin to check the pin bushing in the connecting rod ...

Page 183: ...bearing in until past the ignition plunger hole P R E C I S I O N T V P E D O N O T L I N E R E A M O R B O R E W I T H H O L E V IN B E A R I N G B O R E O U T S I D E FIGURE 53 CAMSHAFT BEARING New crankshaft main bearings are precision type which do not require line reaming or line boring after installa tion They are available in standard size 002 010 020 or 030 undersize CRANKSHAFT Inspect the...

Page 184: ...the crankshaft CRANKSHAFT ENDPLAY After the rear bearing end plate has been tightened using the torque recommended in Assembly Torques and Special Tools check the crankshaft endplay as shown in Figure 56 If there is too much endplay see Dimensions and Clearances for minimum and maximum endplay remove the rear bearing end plate and add a 1 shim Figure 54 between the thrust washer and plate Reinstal...

Page 185: ...d directly from the engine crank case Refer to the instructions screened on the case of the reduction gear assembly OIL PUMP To remove the oil pump it is necessary to detach the intake cup assembly as shown in Figure 58 Check the oil pump thoroughly for worn parts Oil the pump to prime it before reinstalling Except for gaskets the component parts of the pump are not available individually The suct...

Page 186: ...the outer sealing edges where gaskets f i t The heads are made of aluminum and can be damaged by careless handling 3 Use new head gaskets and clean both the heads and the cylinder block thoroughly where the head gaskets rest 4 Place heads in position and follow head torque tightening sequence shown in Figure 59 Start out tightening all bolts to 5 ft lb then 10 ft lb etc until all bolts are torqued...

Page 187: ... F S A E 30 F O R EXTREME OPERATING TEMPERATURES S E E Y O U R SERVICE MANUAL BATTERY V O L M A N U F A C 1 U R E O BT o O N A J D I V I S I O N OF O N f l N C O B P O R A 1 I O N MINNEAPOLIS MINNESOTA USA OOA For handy reference insert YOUR engine nameplate information in the spaces above 2 Do not order by reference number or group number always use part number and description 3 Give the part num...

Page 188: ... 1 1 809 35 1 Screw Breather Cap Clamp 12 B E A R I N G C R A N K S H A F T R E A R 101K420 1 Standard 20 101 K420 02 1 0 0 2 U n d e r s i z e I 0 I K 4 2 0 I 0 1 0 1 0 Undersize P A R T Q T Y NO USED I 0 I K 4 2 0 2 0 101 K420 30 I04A575 P A R T D E S C R I P T I O N I 0 I B 4 I 5 P L A T E REAR I 0 I C 4 0 6 I 0 I B 4 I 7 I 0 I B 4 0 5 509A4I 5 I 6 A 7 2 4 N U T H E X I 0 4 A 9 I 5 I 0 4 A 9 I ...

Page 189: ... v e Box Cover Mounting 1 4 20 x 2 806 27 2 Cylinder Block 3 8 16 x 3 4 I 2 3 A 9 5 I I Clamp Breather Tube Cap I23A958 I Screen Breather T u b e 509 11 7 I Seal O Ring Breather Tube I I 0 A 6 8 2 G a s k e t V a l v e Guide Intake S T U D C Y L I N D E R H E A D M O U N T I N G 520A7I7 8 3 8 x 1 7 8 520A773 12 3 8 x 2 5 16 B E A R I N G C R A N K S H A F T F R O N T I 0 I K 4 3 2 I Standard I 0 I...

Page 190: ...nd Tapped for Flywheel Alternator Models B e a r i n g Governor Shaft Upper Shaft A r m Governor Y o k e Governor Shaft Screw Yoke Mounting P i n Governor Cup Stop In Gear Cover B e a r i n g Governor Shaft Lower B a l l Bearing Governor Shaft E x t e n s i o n Governor Arm Seal Oil Gasket Gear Cover Seal Gear Cover P i n Gear Cover 5 16 x 1 1 8 Gear Cover Mounting 5 16 18 x 1 3 4 800 34 I Gear Co...

Page 191: ...R T NO 8 9 10 I I 12 13 I 4 F L Y W H E E L I34B2530 I34C2462 526 18 5 2 6 A I 2 8 850 55 I 0 4 A I 7 0 I34C673 I34B2433 821 10 Q T Y USED ASSEMBLY P A R T D E S C R I P T I O N I Standard Units Includes Ring Gear I Units w i t h F l y w h e e l A l t e r n a t o r System Includes Ring Gear and Magnet Ring Optional 3 Washer Flat Guard M o u n t i n g I Washer Flywheel Mounting I Washer Lock F l y ...

Page 192: ...I 4 B 188 20 4 0 2 0 U n d e r s i z e 1 I 4 B 188 30 4 0 3 0 Undersize 8 R I N G S E T PISTON 1 I 3 A I 6 5 2 Standard 1 I 3 A I 6 5 0 5 2 0 0 5 Oversize 1 I 3 A I 6 5 I 0 2 0 1 0 O v e r s i z e 1 I 3 A I 6 5 2 0 2 020 Oversize 1 I 3 A I 6 5 3 0 2 0 3 0 O v e r s i z e 1 I 3 A I 6 5 4 0 2 040 Oversize 8 C A M S H A F T G R O U P R E F P A R T NO N O 1 C A M S H A F T I05B382 I50A75 515 1 I 0 5 A...

Page 193: ...eal O i l F i l t e r Air 22 1 1 122A3 63 1 Adapter O i l Filter 12 122A3 21 1 Gasket Adapter 23 13 I22B323 1 F i l t e r O i l 24 3 0 9 A I 0 193 108 526 65 SCREW H E X C A P 25 800 28 800 7 850 40 505 57 I 9 3 A 6 8 193 107 5 0 I A 4 502 5 502 20 P A R T D E S C R I P T I O N S w i t c h L o w O i l Pressure Optional T e e L o w O i l Pressure Switch Optional Sender O i l Pressure Optional Washe...

Page 194: ... s k e t Fuel Pump Mounting 1 4 153 263 1 Bracket Clamp Manual Choke Optional 15 800A538 4 Screw 3 8 16 x 1 1 2 Intake M a n i f o l d Mounting 16 868 2 2 Nut Hex Jam Carburetor Mounting 17 854 17 2 Washer Shakeproof Carburetor Mounting 18 806 9 2 Screw Fuel Pump Mounting 19 8 0 0 P 5 I 2 4 Screw 5 1 6 1 8 x 1 Exhaust Adapter Mounting 20 850 45 4 Washer L o c k 5 1 6 21 I 5 4 B I 4 8 4 2 Adapter E...

Page 195: ... E 14 1 742 1 Manual Choke Units 141B679 1 E l e c t r i c Choke Units 19 141P699 1 W a s h e r Choke Shaft Manual Choke Units 20 141P697 1 A S e a l Felt Manual Choke U n i t s 21 141P203 1 R e t a i n e r F e l t Seal Manual Choke Units 22 14 1 809 1 Shaft Lever T h r o t t l e 23 141 799 1 S p r i n g F l o a t 1 Parts Contained in Repair K i t A Parts Contained in Gasket K i t F U E L PUMP P A...

Page 196: ...7 1 Washer Shakeproof 5 1 6 4 I 5 3 B 3 9 I 1 Core Solenoid 19 526 22 1 Washer Flat 5 I 5 3 A 3 9 5 1 Armature 20 864 2 1 Nut Hex 5 16 18 6 3 0 7 B 8 0 I 1 C o i l Solenoid A s s e m b l y 21 813 107 1 Screw i 0 32 x 1 1 4 Chok 7 I 5 3 B 3 9 2 I Frame Solenoid Body to Mounting Plate 8 I 5 3 B 3 8 7 1 Spring 22 526A8 1 Washer Flat 9 153B390 1 L e v e r Thermostat 23 850 30 1 Washer Lock 10 10 526 1...

Page 197: ... Adapter to Carburetor 6 I45A398 1 Adapter Carburetor A i r Inlet 7 503A582 1 Hose Breather 8 503 170 Clamp Breather Hose 9 503P365 1 Clamp Hose Air Cleaner 10 I 4 0 A I 185 1 Gasket Air Cleaner 1 1 815 199 3 Screw 10 32 x 5 1 6 Adapter Mounting 12 850 30 3 Washer L o c k f 10 13 821 10 4 Screw 1 4 20 x 1 2 Air Cleaner Panel Mounting 14 I 9 3 B 2 I 8 1 Panel Instrument Optional 15 800 3 2 Screw 1 ...

Page 198: ...t Side P l u g Spark Box Breaker Includes Parts Marked O Ring Spark Plug Cables Clamp C o i l Mounting S w i t c h T o g g l e Ignition Start On Off Optional R E F P A R T Q T Y P A R T NO NO U S E D D E S C R I P T I O N 15 302A60 I Ammeter DC 2 0 0 2 0 Optional 16 3 3 6 A 2 I 3 2 I L e a d A s s e m b l y Points to Coil 17 815 358 4 Screw Pan Head I Condenser Mounting I Breaker Points Mounting 2...

Page 199: ...tandard Governor Controlled Engines Joint Ball A l l Governor Controlled Engines L i n k T h r o t t l e A l l Governor Controlled Engines Palnut L o c k i n g A l l Governor Controlled Engines Bracket Variable Speed Control Optional Lever Variable Speed Control Optional Nut Keps A l l Governor Controlled Engines Washer Variable Speed Lever T e n s i o n Optional Stud Variable Speed Adjustment Opt...

Page 200: ...52 ...

Page 201: ...ew 1 4 x 1 2 Support Mounting 12 4 0 5 A I 9 3 5 1 Hood Assembly Engine Includes Parts Marked Optional 13 4 0 5 B I 9 3 4 1 H o o d Engine 14 4 0 5 A I 8 7 2 2 C l i p Hood 15 818 150 4 R i v e t Drive 16 526 3 4 Washer Flat 17 821 10 2 Screw 1 4 20 x 1 2 Hood Mounting 18 870P258 2 Stud 1 4 20 Hood Mounting Included in Engine Hood A s s e m b l y S I D E M O U N T E D F U E L T A N K G R O U P O P...

Page 202: ... Lever A Spring Lever B H o l d e r Spring Bracket A s s e m b l y Rear Washer P l a i n Washer Plain R E F P A R T Q T Y P A R T NO NO U S E D D E S C R I P T I O N 15 191 756 1 Washer Insulator 16 91 757 4 Brush 17 191 758 4 Spring Brush 18 1 91 759 2 Bolt Through 19 191 760 3 Screw Machine P H 20 191 761 1 Switch A s s e m b l y Solenoid 21 191 762 1 C o i l A s s e m b l y F i e l d 22 191 763...

Page 203: ...e Housing Includes Cover A l s o Order 2 5 I 6 A I 2 Pins P i n D o w e l Cover to Housing Gasket Housing to Engine Gasket Cover to Housing Plate Bearing Retainer Shim Set End Play Adjustment I Each 0 0 5 0 0 9 0 1 2 0 1 6 0 2 0 0 2 5 Seal O i l Retainer Plate Washer Pinion Gear Key Pinion Gear Gear Pinion Cup Roller Bearing Engine End Cone Roller Bearing Engine End Gear Driven Key Driven Gear Rin...

Page 204: ...0 25 2 13 860 8 2 14 8I3 I00 2 15 856 3 2 16 I67AI88 I 17 338A6I9 I 18 336A2I32 I P A R T D E S C R I P T I O N Screw 8 32 x 3 4 Terminal Block to Bracket Washer L o c k 8 Terminal Block to Bracket Nut 8 32 Terminal Block to Bracket Screw 10 32 x I 2 Bracket to Cylinder Block Washer L o c k 10 C l i p Regulator Harness Harness Wiring Start Solenoid to Terminal Block Lead Assembly Terminal Block to...

Page 205: ...R M2 1 METER OIL PRESSURE SI 1 SWITCH START SZ 1 SWITCH IGNITION S3 1 BREAKER CAP ASSEMBLY S 4 1 SWITCH LOPKO Tl 1 COIL IGNITION TBI 1 BLOCK TERMINAL S T R I P M A R K E R VRI 1 REGULATOR VOLTAGE Wl 1 JUMPER SEE NOTE l WHEN USED w CAUTION REG r L REGULATOR MUST BE GROUNDED THROUGH MOUNTING BOLTS NOTE 1 REMOVE JUMPER Wl WHEN AMMETER Ml IS USED ENGINE WIRING DIAGRAM INCLUDES F L Y W H E E L ALTERNAT...

Page 206: ...rized Parts and Service Centers is provided in our brochure F 115 a copy of which is supplied with each Onan Product These Onan Authorized Service Centers have trained service personnel parts stock and the necessary facilities and tools for the service and repair of Onan equipment Material Allowances Onan will allow credit or furnish free of charge to the Onan Authorized Service Station or his App...

Page 207: ...in the future Adequate evidence of this scheduled maintenance must be offered when applying for a warranty claim INSTALLATION Installation is extremely important and all Onan Products should be installed in accordance with the manufacturer s recommendations If the owner experiences any difficulty with such items as mounting ventilation exhaust location fuel lines wiring etc he should immediately c...

Page 208: ...PERATOR S SERVICE MANUAL AND PARTS CATALOG FOR SERIES N H C INDUSTRIAL ENGINES 902486 O N A N 400 73RO AVINUE N I MINNIAPOUS MINNESOTA BB432 4 ontvom of OMAM ccMfOtunoM 9 4 0 4 0 4 9 A 7 2 rrttMla U I A ...

Page 209: ... 3 Dimensions and Claarances 4 Assembly Torques and Special Tools 6 Troubleshooting Chart 7 Installation 8 Operation 11 Service and Maintenance 12 Fuel System 15 Governor System 20 Ignition and Battery Charging 23 Starting System 26 Engine Disassembly 31 Parts Catalog 39 Engine Wiring Diagram 57 902487 ...

Page 210: ... i i n i n Mill tinilrr thi a r r a r m repair or r r p l a r r a nan r l rr lii h o n i v a m m j n o n thai t l i w l n t n O n a n wii fartt tn l o ha f Ur I r f r i o f m material anri nrknianahi i r n t i H n l lhal w h part hall In rMnrni d i n I Inan farinrv nr n n r o f i t ulhnriKrH S r r v i r S t a l i n n t tr n inriHlM n r h a r g r prrpairf n n U l r r t h a n o o 11 I MT a f t r r i...

Page 211: ...y With Filter Change V Starting l e c t r i c Ignition t t e r y Combustion Air cfm 3600 rpm 80 P u e j Gasoline regular grade Fuel Pump Diaphragm 4 ft lift TUNE UP SPECIFICATIONS Spark Plug Gap S Breaker Point Gap u Ignition Timing Fixed Electric Start Units 25 BTC Tappets Cold Intake JOJ Exhaust 0 l 2 NOTE For gaseous fuel operation set spark plugs at 018 and ignition timing at 260 BTC and exhau...

Page 212: ...5 0 7480 Vaive Lifter Bore 0 7505 0 7515 Valve Seat Interference Width 1 32 3 64 Valve Face Angle 4 4 Valve Seat Angle 4 5 0 Vaive Interference Angle 1 Crankshaft Main Bearing 0 0025 0 0038 Crankshaft End Play 0 005 0 009 Camshaft Bearing 0 0015 0 003 Camshaft End Play 0 003 Camshaft Lift 0 300 Camshaft Bearing Diameter 1 3760 1 3770 Camshaft Journal Diameter 1 3740 1 3745 Rod Bearing Forged Rod 0...

Page 213: ...ull Separation v 0 Spark Plug Gap For Gasoline Fuel 1 9992 2 0000 Crankshaft Main Bearing Journal Standard Size 2 0015 2 0040 Main Bearing Diameter o o 0 1 5 0 0043 Main Bearing Clearance j 1 6260 Crankshaft Rod Bearing Journal Standard Size Cylinder Bore Standard Size Set exhaust valve at 014 for gaseous fuel operation 902490 ...

Page 214: ...b Cylinder Head Nuts 17 19 Rear Bearing Plate 20 Connecting Rod Bolt 27 29 Flywheel Capscrew 30 35 Starter Mounting Bracket to Oil Base Screws 43 48 Gear Case Cover 8 10 Oil Pump 7 9 Other 3 8 Cylinder Block Nuts 18 23 Intake Manifold 18 20 Exhaust Manifold 10 12 SPECIAL TOOLS These tools are available from Onari to aid service and repair work Crankshaft Gear Pulling Ring 420A248 Flywheel Puller 4...

Page 215: ...n Rings Worn or Broken Wrong Bearing Clearance COOLING SYSTEM AIR C O O L E D P oor A i r C i r c u l a t i o n D t or O i l y C j Q l m g F i n s Blown Head Gasket COOLING SYSTEM WATER C O O L E D In sufficient Cool ant Faulty Thermostat W o r n Water P u m o or P u m p S e a l Water Passages Restricted Defective Gasket Blow i Heap Gasket L U B R I C A T I O N SYSTEM Defective Oil Gauge Relief Va...

Page 216: ...lation will be no problem However in protecting the engine from the elements see that nothing obstructs the flow of air around the engine EXHAUST Pipe POISONOUS exhaust gas outside enclosure Use a length of flexible tubing between the engine exhaust outlet and any rigid piping to absorb engine vibration Shield the line if it passes through a com bustible wall or partition If turns are necessary us...

Page 217: ...ctory or in the field Install the clutch accord ing to the following instructions and Figure 3 Provide room for the clutch adapter casting by plugging the wet holes with a 3 8 16 x 1 2 slotted headless set screw Apply sealing compound to the threads and install screw flush with the cylinder block Drill a 13 64 hole or filed slot in the crankshaft for the clutch set screw Locate center of hole 11 3...

Page 218: ... 7 16 14 x 2 on the lower and one cap screw 7 16 14 x l 3 4 o n the upper 2 cylinder side Install the stud washer and nut Lubricate the two grease fittings just until grease appears B A T T E R Y CONNECTIONS Engines with Automotive Type Separate Starter Connect the 12 volt battery positive cable to the engine start switch terminal Connect the battery negative cable to the ground point on the engin...

Page 219: ...t four steps each step of not less than 30 minutes running time Start with 1 4 load then 1 2 3 4 and full load BATTERY CHARGING The battery charge rate is controlled by a charge regulator The regulator is set to allow the proper rate of charge at operating speed STOPPING THE ENGINE Disconnect all load before stopping the engine Engines equipped with battery ignition are stopped by the igni tion sw...

Page 220: ...ly until the proper service time perinis can be established When anv cbn r T aiiiies occur in operation unusual noises fron engine or accessories loss of power overheating etc contact vour On ar Healer CRANKCASE O I L ihe oil capacity is 3 1 2 U S quarts 4 with filter Fill to the F U L L mark on the oil level indicator Use a good quality detergent oil with the API American Petroleum Institute desi...

Page 221: ... drip pan located below the filter Coat rubber gasket on filter with a film of oil before installing Install ihe filter finger tight plus 1 4 to 1 2 turn If oil becomes so dirty that the markings on the oil level indicator cannot be seen change the filter and shorten the filter service period OIL F I L T E R D R I P P A N FIGURE 6 O I L F I L T E R L O C A T I O N CRANKCASEBREATHER The engine is e...

Page 222: ...nths there after or everv lOOhours Use only SAE50 motor oil or SAE90 mineral gear oil Do not use lubricants commonly known as extreme pressure lubricants hypoide lubricants etc Maintain the proper oil level between changes Over filling will cause foaming which can lead to an oil leak due to overheating Remove the filler plug on top of the case and the oil level plug from the face of the gear case ...

Page 223: ...down to about 400 500 rpm 3 Set the idle adjustment screw for even operation so the engine is firing on both cylinders and is running smooth ly 4 Release the governor mechanism to allow the engine to accelerate If the engine accelerates evenly and without a lag the main adjustment is correct If not adjust the needle outward about 1 4 turn and again slow down the engine and release the mechanism Co...

Page 224: ... plate is marked with the letter C install it with the mark on the side toward the idle port when viewed from the flange end of the carburetor To center the plate back off the top screw close the throttle lever and then set the plate by tapping it with a small screw driver Install the choke shaft and plate Center the plate in the same manner as the throttle plate see step above Use new screws and ...

Page 225: ...valve retainer gasket 4 Clean the pump body thoroughly with a solvent and a fine wire brush 5 Holding the pump cover with the diaphragm surface up place the new valve gasket in the cavity Assemble the valves in the cavitv Reassemble valve retainer Lock in position by inserting and tightening the fuel pump retainer screw 6 Place the pump body assembly in a clean work area and rebuild the lower diap...

Page 226: ... assem bly With the element at room temperature check the heater resistance with an ohmmeter The resistance should be about 37 8 to 46 2 ohms for a 12 volt system If the heater is defective replace There must be slack in the lead wires between the choke body and the bimetal and heater assembly When the start button is engaged the solenoid should cause the spring loaded lever to contact the solenoi...

Page 227: ...from gas supply line Install test hole plug in regulator Open gas supply line valve See that vent fitting is installed 5 With a clamp on each end secure the hose between the regulator outlet nipple and the carburetor inlet 6 Operate the engine to assure quick starting results Gos Carburetor Adjustment 1 Adjust the main gas adjusting screw M on the carburetor depending upon the type of gas used For...

Page 228: ...nts A binding condition at any point will cause the governor to act slowly and regulation will be poor Excessive looseness will cause a hunting condition and regulation will be erratic Work the arm back and forth several times by hand while the engine is idle If either of these conditions exist determine the cause and adjust or replace parts as needed Procedure 1 Adjust the carburetor main jet for...

Page 229: ...ngine speed with no load connected and again after connecting full load Do not exceed 4000 rpm at no load The sensitivity of the governor depends upon the position of the arm end of the governor spring A series of holes in the governor arm provides for adjustment To increase sensitivity move the spring toward the gover nor shaft To decrease sensitivity move the spring toward the linkage end of the...

Page 230: ...pproximately 1500 rpm or the desired low speed at no load by turning the knob as required 4 Adjus the sensitivity while operating at minimum soeed to attain the smoothest no load to full load operation as follows To decrease sensitivity allow more speed drop from no load to full load operation move the governor spring outward into a different groove or hole in the extension arm To increase sensiti...

Page 231: ...ticing poor engine performance Proceed as follows Timing Procedure Engine Running 1 To accurately check the ignition timing use a timing light with engine running at idle speed Con nect the timing light according to its manufacturer s instructions Either spark plug can be used as they fire simultaneously 2 Start the engine and check the timing The mark on the flywheel should line up with the 250 m...

Page 232: ...a hydrometer The specific gravity reading shouldjbe approximately 1 280 a f 8 0 o F If one or more cells are low on water add distilled water and recharge Keep the battery case clean and dry An accumulation of moisture will lead to a more rapid discharge and battery failure Keep the battery terminals clean and tight After making connections coat the terminals with a light application of petroleum ...

Page 233: ...IGH CHARGE RATE TEST procedure No Charge Test Perform as follows 1 Check the B to ground voltage using a DC voltmeter 2 If voltmeter reads 13 8 volts or higher add a load to system e g headlights to reduce battery voltage to below 13 6 volts 3 Observe ammeter If charge rate increases consi der the system as satisfactory If charge rate does not increase proceed with testing 4 Disconnect plug from r...

Page 234: ...e commutator NOTE These washers are inserted so the steel washer is located in the commutator side FIGURE 28 REMOVING THROUGH BOLTS 3 The armature can easily be removed from the front bracket Be careful not to miss a small steel washer used in the end of the armature shaft The shift lever can be removed along with the armature when it is removed In this case the spring holder lever springs and ret...

Page 235: ... Thoroughly dry any parts that have come into contact with the cleaning lluid 2 Apply 20 weight non detergent oil to the armature shaft and splines Apply grease Shell Albania No 2 or equivalent sparingly on the shift lever pin the joint of the shift ever and plunger the plunger and spacing washers at the end of the shaft 3 To mount the overrunning clutch first insert the r pinion stopper into the ...

Page 236: ...ely place for an open circuit to occur is at the commutator riser bars Inspect the points where the conductors are joined to the commutator bars for loose connections Testing Commutator Runout Place armature in a test bench and check runout with a dial indicator When commutator runout exceeds 004 commuta tor should be refaced Figure 36 FIGURE 36 CHECKING COMMUTATOR RUNOUT 5 Testing Armature Shaft ...

Page 237: ...rushholder On a new brush the spring tension should be 29 to 38 ounces FIGURE 41 BRUSH SPRING TENSION TEST INSPECTION AFTER OVERHAUL 1 For no load test the starting motor is wired as shown in Figure 42 and revolved The value of the meter reading at this condition should be as follows Voltage 11 5 volt Speed 3700 rpm minimum Current Draw 60 amp maximum NOTE The conductor or this test should be larg...

Page 238: ...te measure the clearance between the end of the pinion and pinion stopper when the pinion is pushed lightly toward the cbm mutator end Clearance should be 02 to 06 Adjust for proper clearance by removing the magnetic switch attaching screws and select proper thickness of the fiber packings shown in Figure 44 FIGURE 43 BATTERY CONNECTIONS FIGURE 44 ADJUSTING PINION CLEARANCE 30 902515 ...

Page 239: ...e and the width of the seat band should be 1 32 to 3 64 of an inch wide Grind only enough to assure proper seating Remove all grinding compound from engine parts and place each valve in its proper location Check each valve for a tight seat using an air pressure type test ing tool If such a tool is not available make pencil marks at intervals across the valve face and observe if the marks rub off u...

Page 240: ... valve tappet 5 To correct the valve clearance turn the adjusting screw as needed to obtain the right clearance The screw is self locking 6 To adjust valves on the right hand cylinder turn engine one complete revolution and again line up mark on the flywheel and the TC mark on the gear cover Then follow adjustment procedure given for left hand cylinder 7 Replace all parts removed Tighten all screw...

Page 241: ... a flat spot If the arms of the ball spacer are worn or otherwise damaged remove the spacer by splitting with a chisel Replace the spacer with a new one The governor cup must spin freely on the camshaft center pin without excessive looseness or wobble If the race surface of the cup is grooved or rough replace it with a new one When installing the governor cup tilt the engine so the gear is up put ...

Page 242: ... contact Figure 51 I M P R O P E R R I N 6 C O N T A C T C Y L I N D E R W A L L FIGURE 51 NEW RING IN WORN RING GROOVE Replace pistons showing signs of bad scoring or burring excessive skirt clearance wavy or worn ring lands fractures or damage from detonation Replace piston pins showing fractures scored bores or bores out of round more than 0 002 Use a new piston pin to check the pin bushing in ...

Page 243: ...aring in until past the ignition plunger hole P R E C I S I O N T V P C O O N O T L I N E N C A M O R B O R E OUTSIDE W I T H H O L E IN B E A R I N G B O R E FIGURE 53 CAMSHAFT BEARING New crankshaft main bearings are precision type which do not require line reaming or line boring after installa tion They are available in standard size 002 010 020 or 030 undersize CRANKSHAFT Inspect the bearing j...

Page 244: ...t in place while installing the crankshaft CRANKSHAFT ENDPLAY After the rear bearing end plate has been tightened using the torque recommended in Assembly Torques and Special Tools check the crankshaft endplay as shown in Figure 56 If there is too much endplay see Dimensions and Clearances for minimum and maximum endplay remove the rear bearing end plate and add a shim Figure 54 between the thrust...

Page 245: ...directly from the engine crank case Refer to the instructions screened on the case of the reduction gear assembly OIL PUMP To remove the oil pump it is necessary to detach the intake cup assembly as shown in Figure 58 Check the oil pump thoroughly for worn parts Oil the pump to prime it before reinstalling Except for gaskets the component parts of the pump are not available individually The suctio...

Page 246: ...r sealing edges where gaskets f i t The heads are made of aluminum and can be damaged by careless handling Use new head gaskets and clean both the heads and the cylinder block thoroughly where the head gaskets rest Place heads in position and follow head torque tightening sequence shown in Figure 59 Start out tightening all bolts to 5 ft lb then 10 ft lb etc until all bolts are torqued to 17 19 ft...

Page 247: ...SERIAL NO s0 UH i f e For handy reicrence insert YOUR engine nameplate information in the spaces above 2 Do not order by reference number or group number always use part riumber and description 3 Give the part number description and quantity needed of each item If an older part cannot be identified return the part prepaid to your dealer or nearest AUTHORIZED SERVICE STATION Print your name and add...

Page 248: ...over V a l v e Compartment I IOB 1720 2 G a s k e t V a l v e Cover 517 48 I P U g Camshaft Expans ion S20A736 5 Stud Rear Bearing Plate Mounting Gasket C y l i n d e r Head Q T Y USED P A R T D E S C R I P T I O N I 0 1 0 U n d e r s i z e I0IK420 20 1 IOIK 420 30 1 13 I04A575 2 1 4 1018415 1 15 PLATE REAR I0IC406 1 I0IB4I7 1 16 I0IB405 2 17 509A4I 1 18 5I6A72 4 19 NUT HEX I04A9I 5 I04A9I 20 20 W...

Page 249: ...958 509 1 17 I I 0 A 6 8 P A R T D E S C R I P T I O N Rotocap Valve Box Cover Mounting 1 4 20 x 2 j Cylinder Block 3 8 16 x 3 4 Clamp Breather Tube Cap Screen Breather Tube Seal O Ring Breather Tube Gasket Vaive Guide Intake STUD C Y L I N D E R H E A D MOUNTING 520A7I7 8 3 3 x 1 7 3 520A773 12 3 8 x 2 5 16 B E A R I N G C R A N K S H A F T F R O N T I 0 I K 4 3 2 I Standard I0IK432 02 I 0 0 2 Un...

Page 250: ...r Shaft 5 8i 5 46 2 Sc ew Yoke Mounting 6 516 30 l P m Governor Cup Stop In Gear Cover 7 S OAS i Bearing Governor Shaft Lower 3 5 i 0 P 4 l B a l l Searing Governor Shaft 9 1508 073 i t e n s i o n Governor Arm 10 509 P9 l Seal Oil t i C 3 8 1 1 Gasket Gear Cover 2 50 A40 i Sea i Gear Co er 3 5 o A 1 2 P n Gear Cover 5 16 x 1 8 SCPE HEX C A P SCO 2 4 Ce Co er Mounting 5 16 13 x i i t i i i Gear Co...

Page 251: ...Retaining I Lock Crankshaft Gea Vasner R E F NO 2 I 3 I 4 PART NO Q T Y USED P L Y A H E E L ASSEMBLY I34B2530 I i34C2462 I P A R T D E S C R I P T I O N 526 iS 526Ai 2 350 55 I 04 A I 70 3 C6 3 I 3462433 321 10 Sianaarc Units ilnciydes Ring Gear Units w i t h F l y w h e e l Alternator System t nciudes Ring Gear ana Magnet Rmgl Ootional Aasher Flat Guara Mounting Aasher Flywheel Mounting Washer L...

Page 252: ...88 30 4 0 3 0 Undersize 9 RING S E T PISTON 113AI6S 2 Standard 1 I 3 A I 6 5 0 5 2 005 Oversize I I 3 A I 6 S I 0 2 0 1 0 Oversize 1 1 3 A I 6 5 2 0 2 020 Oversize 1 1 3 A I 6 S 3 0 2 0 3 0 Oversize 1 I 3 A I 6 5 4 0 2 040 Oversize rNi si C A M S H A F T G R O U P R E F NO P A R T Q T Y P A R T NO USED D E S C R I P T I O N 1 C A M S H A F T I05B382 I Governor Controlled Engine Includes Center P m...

Page 253: ...er O i l Filter I Gasket Adapter I F i l t e r O i l R E F NO P A R T NO Q T Y USED 14 3 0 9 A I 0 15 502 58 _I6 17 I 9 3 I 0 8 526 65 P A R T D E S C R I P T I O N Switch L o w O i l Pressure Optional T e e L o w O i l Pressure Switch Optional Sender O i l Pressure O p t i o n a l 18 SCREW H E X C A P 19 20 21 22 23 24 25 800 28 800 7 850 40 505 57 I 9 3 A 6 8 193 107 5 0 I A 4 502 5 502 20 Washe...

Page 254: ...nting 14 153 263 1 Bracket Ciamp Manual Choke Optional 15 800A538 4 Screw 3 8 16 x 1 1 2 Intake Manifold Mounting 16 868 2 2 Nut Hex Jam Carburetor Mounting 17 854 17 2 Washer Shakeproof Carburetor Mount mg 18 806 9 2 Screw Fuel Pump Mounting 19 8 0 0 P 5 I 2 4 Screw 5 I 6 I 8 x 1 Exhaust Adapter Mounting 20 850 45 4 Washer Lock 5 1 6 21 15481484 2 Adapter Exhaust Manifold 22 1 5 4 A I 4 8 2 2 G a...

Page 255: ...4 13679 E l e c t n c Choke Units 19 14 1P699 Washer Choke Shaft Manual Choke Units 20 14 1P697 A S e a l Felt Manual Choke Units 21 141P203 R e t a i n e r F e l t Seal Manual 22 Choke Units 22 14 1 809 Shaft Lever T h r o t t l e 23 141 799 1 Spring F loat Parts Contained m Repair K i t A Parts Contained in Gasket K i t F U E L PUMP P A R T S G R O U P R E F P A R T Q T Y P A R T NO NO USED D E ...

Page 256: ...mostat 10 526 18 I Washer l 7 64 1 0 x 5 8 0 0 x 1 1 6 I I 870 134 I Palnut I 4 20 12 I53A399 2 Insulator 13 1538400 I Heater A s s e m b l y I t 5 18 129 I Ring Retaining R E F NO 15 16 1 7 i3 i 9 20 2 P A R T NO QT Y USED 332A876 L E A D C H O K E 3 3 6 A i 5 5 0 3 3 6 A I 5 4 9 357 17 526 22 364 2 8 I 3 I 0 7 22 526A3 23 850 30 24 812 76 25 26 854 7 315 161 P A R T D E S C R I P T I O N T e r m...

Page 257: ...dapter to Carburetor 6 I45A398 1 Adapter Carburetor Air Inlet 7 503A582 i Hose Breather 8 503 170 Clamp Breather Hose 9 503P365 1 Clamp Hose Air Cleaner 10 MOAI 185 l Gasket Air Cleaner 1 1 31 5 199 3 Screw 10 32 x 5 16 Adapter Mounting 12 850 30 3 Washer L o c k C lO 13 821 10 4 Screw 1 4 20 x 1 2 Air Cleaner Panel Mounting 14 1938218 1 Panel Instrument Optional 15 800 3 2 Screw 1 4 20 x 1 2 Inst...

Page 258: ...de Coil Ignition C a b l e Spark Plug L e f t Side P l u g Spark Box Breaker Includes Parts Marked O Ring Spark Plug Cables Clamp C o i l Mounting S w i t c h Toggle Ignition Start On Off Optional 15 16 17 18 19 20 302A60 336A2I32 815 358 WASHER 850 25 850 25 526 3 815 373 L O C K Ammeter OC 20 0 20 Optional Lead A s s e m b l y Points to Coil Screw Pan Head I Condenser Mounting I Breaker Points M...

Page 259: ...ernor Controlled Engines Joint Ball A l l Governor Controlled Engines L i n k Throttle A l l Governor Controlled Engines Palnut L o c k i n g A l l Governor Controlled Engines Bracket Variable Speed Control Optional Lever Variable Speed Control Optional Nut Keps All Governor Controlled Engines Washer Variable Speed Lever Tension Optional Stud Variable Speed Adjustment Optional Nut Variable Speed A...

Page 260: ...52 902537 ...

Page 261: ...upport Mounting 12 4 0 5 A I 9 3 5 1 Hood A s s e m b l y Engine Includes Parts Marked Optional 13 4 0 5 B I 9 3 4 1 Hood Engine 14 40SAI872 2 C l i p Hood 15 818 150 4 R i v e t Drive 16 526 3 4 Washer Flat 17 821 10 2 Screw 1 4 20 x 1 2 Hood Mounting 18 870P258 2 Stud 1 4 20 Hood Mounting Included in Engine Hood Assembly S I D E M O U N T E D F U E L T A N K Q R O U P O P T I O N A L E Q U I P M...

Page 262: ...1 1 Spring Lever B 26 1 1 191 752 1 Holder Spring 12 191 753 1 Bracket A s s e m b l y Rear 27 13 191 754 1 Washer Plain 14 191 755 1 Washer Plain P A R T Q T Y P A R T NO U S E D D E S C R I P T I O N 191 756 I Washer Insulator 191 757 4 B r u s h 191 758 4 Spring Brush 191 759 2 B o l t Through 191 760 3 Screw Machine P H 191 761 I Switch A s s e m b l y Solenoid 191 762 I C o i l A s s e m b l ...

Page 263: ...ustment I Each 0 0 5 0 0 9 0 1 2 0 1 6 0 2 0 0 2 5 8 509 16 I Seal O i l Retainer Plate 9 I 9 0 A I 9 5 I Washer Pinion Gear 10 5 I 5 A I 4 2 I Key Pinion Gear I I I 9 0 A I 9 I I Gear Pinion 12 510 22 I C u p Roller Bearing Engine End 13 510 21 I Cone Roller Bearing Engine End 14 I90B190 I Gear Driven 15 5 I 5 A I 5 9 I Key Driven Gear 16 518 13 I R i n g Snap Retainer 17 I90A202 I Snacer Bearing...

Page 264: ...o Cylinder Block 5 850 30 3 Washer L o c k Stator Mounting IS 856 3 2 Washer L o c k 10 6 821 18 2 Screw 1 4 20 x 3 4 16 167A188 1 C l i p Regulator Harness Regulator Mounting 17 3 3 8 A 6 I 9 1 Harness Wiring Start Solenoid 7 3 0 I B 3 S 3 0 1 Bracket Terminal Block to Terminal Block 8 3 3 2 A I 2 7 3 1 Strip Marker 18 3 3 6 A 2 I 3 2 1 Lead Assembly Terminal Block 9 332A604 1 B l o c k T e r m i...

Page 265: ... 1 W l TCH S T A R T sa 1 S W I T C H I G N I T I O N S 3 i 3 R E A K E i CAP A S S E M B L Y S 4 1 S W I T C H L O P K O Tl C O I L l V T CN 3 1 B L O C K T E R M I N A L 1 S T R I P M A R K E R V R I i R E G U L A T C P VOLTAGE Wl 1 J U M P C R S C E N O T E l WHEN USED _ CAUTION REG I L REGULATOR MUST BE CROUNOED THR0U6H MOUNTING BOLTS i I REMOVE JUMPER Wl WHEN AMMETER Ml IS USED I ENGINE WIRIN...

Page 266: ...i pMt sfee and the necessaiy facilities and tdol for tbe service and repair otOnaa eqi paeaCT Matarial Allowaacei Onas will allow credit or furnish free of charge to ths Onan Authorised Strvic Station or his Approved Service Dealer all genuine Onan parts used in a warranty repair of these products which fail because of defective material or workmanship Labor Ailowaace Onan will allow wananty repai...

Page 267: ...you avoi df sud n i W this scheduled maintenance must be offered whert appl ng for a wittai INSTALLATIOM Installatioo is extremely important and all Onan Prodacts shoold be installed iir accordanre with the manufacturet recommendations If the owner experiences any difficulty witb sucb iteras as mounting ventilation exhaust location fuel lines wiring ete he should immediately contact the company fr...

Page 268: ...t OPERATOR S SERVICE MANUAL AND PARTS CATALOG FOR SERIES NHC NHCV INDUSTRIAL ENGINES r mm r r s i 9404404 5 r 11B74 Replaces 2A73 9023S5 ...

Page 269: ...PARTS ADDITIONAL COPIES ARE AVAILABLE FOR A NOMINAL CHARGE FROM YOUR DISTRIBUTOR WHEN ORDERING PARTS REMEMBER TO INCLUDE THE MODEL SPECIFICATION LETTER AND SERIAL NUMBER LOCATED ON THE UNIT NAMEPLATE THIS IS ESSENTIAL TO ENSURE THE CORRECT PART IS SHIPPED TO YOU FOR REPAIR SERVICE CONTACT YOUR AUTHORIZED SERVICE REPRESENTATIVE WARNING 70 AVOID POSSIBLE PERSONAL INJURY OR EQUIPMENT DAMAGE AN AUTHOR...

Page 270: ...1 3 4 1 Factory code for general identification purposes 2 Specific Type S MANUAL starting MS ELECTRIC starting 3 Factory code for optional equipment supplied 4 Specification Spec Letter advances with factory production modification TABLE OF CONTENTS TITLE PAGE General Information 1 Safety Precautions 2 Specifications 3 Dimensions and Clearances 4 Assembly Torques ahd Special Tools 5 Engine Troubl...

Page 271: ...fore removing protec tive shields or touching electrical equipment Use rubber insulative mats placed on dry wood plat forms over floors that are metal or concrete when around electrical equipment Do not wear damp clothing partiouiatlv wet shoes or allow skin surfaces to he damp when nandi ng electrical equipment Jewelry is a good conductor ol electricity anu should be removed when working on elect...

Page 272: ...ntilation Required cfm 3600 rpm NHC 1080 cfm 3600 rpm NHCV 1200 Oil Capacity 3 1 2 quart Oil Capacity with Filter Change 4 quart Starting Electric Ignition Battery Combustion Air cfm 3600 rpm 80 Fuel Gasoline regular grade Fuel Pump Diaphragm 4 ft lift Battery 12 Volt TUNE UP SPECIFICATIONS Spark Plug Gap 025 inch Breaker Point Gap 016 inch 9 Ignition Timing Fixed Electric Start Units 20 BTC Tappe...

Page 273: ...Gear Backlash On Pumn Gear Backlash Piston to Cylinder Strut I vpu iMe ismed below oil conlrnllmq imq 90 from pin Cleaianee Piston Pin Diameter Piston Pin in Piston Piston Pin in Rod Piston Ring Gioove Width 1 op 1 1 op 2 I op 3 Piston Rinq Gan in Cvlmnci Pislon Rino Side I lrj tiam ie i t omnression r i m onlv Crankshalt Mam Ijeaiina Journal Slannanl Size ylam I3eai inq Diamet i Main 3eai inii ip...

Page 274: ...ting Rod Bolt 27 29 Flywheel Capscrew 35 40 Starter Mounting Bracket to Oil Base Screws 43 48 Gear Case Cover 8 10 Oil Pump 7 9 Other 3 8 Cylinder Block Nuts 18 23 Intake Manifold 18 20 Exhaust Manifold 10 12 SPECIAL TOOLS SPECIAL TOOLS These tools areavailable from Onan to aid service and repair work Crankshaft Gear Pulling Ring 420 0248 Flywheel Puller 420 0 100 Combination Bearing Remover Main ...

Page 275: ... Sea i_o is r p S o n R r s c n o iB c e r 0 2 Be Tnnj C ei a cc COOLING SYSTEM AIR C O O L E D i Poo A r C i i j a OP C y y O l y C i o r i 5 Bi vr is Gas Vft t COOLING SYSTEM WATER C O O L E D i 5 e Coo ar f F a U t v Trer os a V orn v a e P r s I P 0 Seal aier Passages Res i ce j Oefec i e Gas e s L U B R I C A T I O N SYSTEM Det ec ive 0 1 Gflu Relief Valve Stuck F a u l t y 0 1 PU T D Oirty 0...

Page 276: ...es heat during operation The heated air outlet must allow the heated air to escape freely and prevent recirculation with the cooling air A duct between the compartment air inlet and the engine blower housing may be necessary Locate the air outlet opposite the intake or at least at a 90 degree angle The area of the outlet should be at least 15 percent larger than that of the inlet Allow sufficient ...

Page 277: ... ventilation 2 Air discharge opening is partially blocked by external ducts or exhaust systems 3 Recirculation of heated air into fresh air inlet The vacu flo installation permits greater freedom in choice of locating the air inlet and outlet openings and permits the use of a compartment only slightly larger than the engine itself The area of the air inlet must be at least 140 square inches If a f...

Page 278: ...is shown in Figure 3 K E E P SHAFTS OF ENGINE AND L O A D P A R A L L E L z N E D KEEP P U L L E Y S A L I G WITH EACH O T H E R B E L T IN T I G H T E N E D Q L E R P U L L E Y POSITION P U L L I N G L O A D ENGINE P U L L E Y B E L T IN LOOSENED POSITION NOT P U L L I N G L O A D L O A D P U L L E Y B R A C K E T TO K E E P B E L T O F F ENGINE P U L L E Y FIGURE 3 DRIVE BELT INSTALLATION Comply...

Page 279: ...ed Install set screw to bottom in crankshaft hole then back it out one full turn Tighten clutch retaining screws until clutch is clamped securely to crankshaft Lock the screws and tighten the set screw Apply grease to splined power takeoff shaft Position the clutch throw out to align the grease fitting with the hole in the housing 1 cylinder side horizontal Pull the throw out collar outward to rem...

Page 280: ...vy exhaust smoke when the engine is first started is normal and is caused by inhibitor oil APPLYING LOAD When applying the load to a new or reconditioned engine it should be applied gradually in about four steps each step of not less than 30 minutes running time Start with 1 4 load then 1 2 3 4 and full load BATTERY CHARGING The battery charge rate is controlled by a charge regulator The regulator...

Page 281: ...l batteries in a fully charged condition and maintain charge during storage RETURNING THE SET TO OPERATION 1 CHECK SERVICE IDENTIFICATION TAGS to properly service the engine Uncover and remove all storage seals from engine Remove any dust dirt or foreign matter CHECK fuel supply tanks for moisture ac cumulations drain tanks if necessary CHECK lubricating oil for moisture or contamination drain if ...

Page 282: ...arly scheduled maintenance is the key to lower operating costs and longer service life for the unit The schedule Table 1 can be used as a guide However actual operating conditions under which a unit is run should be the determining factor in establishing a maintenance schedule When operating in very dusty or dirty conditions some of the service periods may have to be reduced Check the condition of...

Page 283: ...gure 9 for maintaining crankcase vacuum No maintenance is generally required Should the crankcase become pressurized as evidenced by oil leaks at the seals or around the cap of the oil level indicator clean baffle in suitable solvent Clean or replace crankcase breather baffle periodically Be sure baffle material doesn t come apart and work into the manifold OIL FILTER Change the crankcase oil filt...

Page 284: ... proper oil level between changes Over filling will cause foaming which can lead to an oil leak due to overheating Remove the filler plug on top of the case and the oil level plug from the face of the gear case Fill the case until the oil just begins to flow from the oil level plug hole Gear box holds 1 2 pint U S measure Replace both plugs See Figure 12 V E N T P L U G R E M O V E P L U G FILL W ...

Page 285: ...n turn the needle in until the engine speed returns to normal 4 Apply a full load to the engine and then carefully turn the main adjustment in until the speed drops slightly below normal Turn the needle out until the engine speed returns to normal Adjustment Under No Load Conditions When a THROTTLE STOP SCREW FUEL IDLE ADJUSTMENT FLOAT BOWL NUT AIN FUEL ADJUSTMENT B FIGURE 14 CARBURETOR ADJUSTMENT...

Page 286: ...plate screws and plate then pull out the choke shaft Carburetor Assembly and Installation Clean the components and repair or replace defective or worn parts Use acetone or alcohol to dissolve gum deposits if carburetor cleaner is not effective Soak the parts in carburetor cleaner using it asdirected by the manufacturer Clean all carbon from the car buretor bowl especially in the area of the thrott...

Page 287: ... work area and rebuild the lower diaphragm section 7 Holding the mounting bracket press down on the diaphragm to compress the spring under it then turn the bracket 90 degrees to unhook the diaphragm so it can be removed 8 Clean the mounting bracket with a solvent and a fine wire brush 9 Replace the diaphragm operating spring stand the new spring in the casting and position the diaphragm Press down...

Page 288: ...P COVER GASKET V A L V E PULSATING DIAPHRAGM FUEL PUMP EXPLODED VIEW SCRIBE LINE PUMP MOUNTS ON NHC BLOWER HOUSING PUMP MOUNTS ON NHCV ENGINE REAR HOUSING FIGURE 17 PULSATING DIAPHRAGM FUEL PUMP 13 902385 ...

Page 289: ... pump All parts must be peiiectly aligned or the THERMO MAGNETIC CHOKE Optional This choke uses a strip heating element and a heat sensitive bimetal spring to control the choke plate position In addition to this a solenoid is actuated during engine cranking closing the choke all or part way depending on ambienttemperature The bimetal is factory set to position the choke to the proper opening under...

Page 290: ...er wire high resistance connections or broken lead wires to the bimetal and heaterassembly With the element at room temperature check the heater resistance with an ohmmeter The resistance should beabout37 8to 46 2ohms fora 12 volt system If the heater is defective rreplace There must be slack in the lead wires between the choke body and the bimetal and heater assembly When the start button is enga...

Page 291: ...st or replace parts as needed Procedure 1 Adjust the carburetor main jet for the best fuel mixture at full load operation 2 Adjust the carburetor idle needle with no load connected 3 Adjust the length of the governor linkage 4 Check the governor linkage and throttle shaft for binding or excessive looseness 5 Adjust the governor spring tension for nominal engine speed at no load operation 6 Check t...

Page 292: ... where a wide range of speed settings is desired The design of the variable speed governors give an automatic increase in sensitivity when the speed is increased and the result is good stability at all speeds To adjust the variable speed governors refer to Figure 21 and the following 1 Run the engine and make necessary carburetor adjustments 2 Adjustthe throttle stop screw on thecarburetorto allow...

Page 293: ...liminated Spark advance is set at 20 BTC before top center and should be maintained forbest engine performance Always check timing after replacing ignition points or if noticing poor engine perfor mance Proceed as follows Timing Procedure Engine Running 1 To accurately check the ignition timing use a timing light with engine running at idle speed Connect the timing light according to its manufactu...

Page 294: ...ting on ohmmeter Place ohmmeter leads inside of spark plug cable holes Figure 26 Secondary resistance should read 14 000 10 ohms 70 F 4 if any of theaboveconditionsarenotmet replace coil Refer to Parts Catalog for correct part number This engine uses a 12 volt negative ground system Alternator must be connected to battery at all times when engine is running Do not reverse battery cables L_ O H M M...

Page 295: ...ht After making connections coat the terminals with a light application of petroleum jelly or grease to retard corrosion Poor contact at the battery cable connections is often a source of trouble Make sure battery cables are in good condition and that contacting surfaces are clean and tightly connected Oo not reverse battery leads Use recommended battery tools when disconnecting leads to avoid mec...

Page 296: ...utput control has a good ground connection Mating surface for mounting must be clean and fasteners tightened properly 4 Never reverse the battery leads Charging system tests require a fully charged battery 20 AMP SYNCHRO SYSTEM The 20 amp flywheel alternator systems use a separate regulator and a separate rectifier Figure 28 Testing For testing this system use a voltmeter ohmmeter such as a Simpso...

Page 297: ...n one polarity with no deflection in the other ALTERNATOR S T A T O R MOUNTED BEHIND B L O W E R W H E E L TO TERMINAL CONNECTOR RECTIFIER A S S E M B L Y REGULATOR A S S E M B L Y FIGURE 29 20 AMP SYNCHRO SYSTEM Full Charge Will Not Regulate Check for broken leads at connection to regulator plates To be sure regulator winding operates properly connect red lead to ground and start engine A maximum...

Page 298: ...pproximately 3600 rpm 28 VAC V O L T A G E R E G U L A T O R R E C T I F I E R V A C U F L O F L Y W H E E L 6 MAGNETS PRESSED INTO F L Y W H E E L NOT REMOVABLE FIGURE 30 15 AMP SYSTEM PHELON VR I High Charging Rate Test Perform this test as follows 1 Check B to ground voltage with a DC voltmeter 2 If voltmeter reads over 14 7 volts replace regulator rectifier assembly 3 If reading is under 14 7 ...

Page 299: ...tween the rear bracket and the commutator These washers are inserted so the steel washer is located In the commutator side FIGURE 34 REMOVING THROUGH BOLTS 3 The armature can easily be removed from the front bracket Be careful not to miss a small steel washer used in the end of the armature shaft The shift lever can be removed along with the ar mature when it is removed In this case the spring hol...

Page 300: ...aning fluid 1 Inspect brushes Figure 37 and clean all parts carefully with a dry cloth and compressed air if it is available 2 Apply 20 weight non detergent oil to the armature shaft and splines Apply grease Shell Albania No 2 or equivalent sparingly on the shift lever pin the joint of the shift leverand plunger the plunger and spacing washers at the end of the shaft 3 To mount overrunning clutch ...

Page 301: ...ing Commutator Runout Place armature in a test bench and check runout with a dial indicator When commutator runout exceeds 004 com mutator should be refaced Figure 42 FIGURE 40 ARMATURE SHORT CIRCUIT TEST FIGURE 42 CHECKING COMMUTATOR RUNOUT 2 Testing Armature for Grounds Touch armature shaft or core and the end of each commutator bar with a pair of ohmmeter leads If the ohmmeter reading is low it...

Page 302: ...anner Figure 45 FIGURE 45 FIELD COIL OPEN CIRCUIT TEST 8 Inspection of Brushes Replace brushes when they are worn less than 3 as shown in Figure46 See that all brushes move freely in their holders ru n n W E A R LIMIT 3 55 FIGURE 47 BRUSH SPRING TENSION TEST INSPECTION AFTER OVERHAUL 1 For no load test the starting motor is wired as shown in Figure 48 and revolved The meter readings for this test ...

Page 303: ...ate measure the clearance between the end of the pinion and pinion stopper when the pinion is pushed lightly toward the commutator end Clearance should be 02 to 06 Adjust for proper clearance by removing the magnetic switch attaching screws and select proper thickness of the fiber packings shown in Figure 50 FIGURE 49 BATTERY CONNECTIONS FIGURE SO ADJUSTING PINION CLEARANCE 902400 34 ...

Page 304: ...the seat band shouid be 1 32 to 3 64 of an inch wide Grind only enough to assure proper seating Remove all grinding compound from engine parts and place each valve in its proper location Check each valve for a tight seat using an air pressure type testing tool If such a tool is notavailable make pencil marks at intervals across the valve face and observe if the marks rub off uniformly when the val...

Page 305: ... and theTCmarkon thegear cover Then follow adjustment procedure given for left hand cylinder 7 Replace all parts removed Tighten all screws securely Torque manifold bolts FLYWHEEL Use a suitable puller with claws or with bolts to agree with flywheel to pull the flywheel D o n o t d r o p t h e y w h e e l A broken fin will I V M U I destroy the balance Always use a steel key for mounting the flywh...

Page 306: ...alls when measuring If the distance is less the engine may race especially at no load remove the center pin and press a new pin in only the required amount Otherwise grind off the hub of the cup as required The camshaft center pin cannot be pulled outward nor removed without damage If the center pin extends out too far the cup will not hold the flyballs properly PISTON AND RINGS Whenever there is ...

Page 307: ...e used on 005 oversize pistons Rings that are 010 020 030 and 040 oversize are to be used on corresponding oversize pistons Rings of the tapered type are usually marked top on one side or identified in some other manner and the ring must be installed with this mark toward the closed end of the piston PISTON RING IN x CYLINDER BORE FEELER GAGE FIGURE 58 FITTING PISTON RINGS TO THE CYLINDER Engines ...

Page 308: ...od bearing areas 3 Peen with 019 diameter cast steel shot 4 Peen for 30 seconds on each crankpin fillet Undersize bearings and connecting rods are available to rework the shaft to 010 020 and 030 under size BEARINGS Removal of the camshaft or crankshaft bearings requires complete disassembly of the engine Use a press or a suitable drive plug to remove the bearings Support the casting to avoid dist...

Page 309: ...ring flush with the block using the combination driver just used for the rear bearing Wipe off any excess Locktite around the bearing Allow at least one hour for hardening at room temperature Lubricate the front main bearing lightly with oil and insert the crankshaft With the rear bearing plate gasket in place and the rear plate bearing lubricated slide the thrust washer grooves toward crankshaft ...

Page 310: ...ies do not use the rearoil seal The reduction gear assembly is oiled directly from the engine crankcase Refer to the instructions screened on the case of the reduction gear assembly CYLINDER The cylinder wears very little in normal service If through improper lubrication or accident the cylinder wall should become scored or worn badly the cylinder may be rebored and honed to accom modate a new pis...

Page 311: ...e outer sealing edges where gaskets fit The heads are made of aluminum and can be damaged by careless handling Use new head gaskets and clean both the heads and the cylinderblock thoroughly where thehead gaskets rest Place heads in position and follow head torque tightening sequence shown in Figure 65 Start out tightening all bolts to 5 ft lb then 10 ft lb etc until all bolts are torqued to 17 19 ...

Page 312: ...er or group number always use part number and description 3 Give the part number description and quantity needed of each item If an older part cannot be identified return the part prepaid to your dealer or nearest AUTHORIZED SERVICE STATION Print your name and address plainly on the package Write a letter to the same address stating the reason for returning the part 4 State definite shipping instr...

Page 313: ...ngine Model and Spec No This Parts Key No represents parts that differ between models Unless otherwise mentioned m the description parts are interchangeable between models Right and left sides are determined by facing the blower end front of the engine ENGINE DATA TABLE MODEL AND SPEC NO PARTS KEY NO MODEL AND SPEC NO PARTS KEY NO NHC MS A 1 NHCV MS A 3 NHC MS B 2 NHCV MS B 4 The Specification Let...

Page 314: ...7 1 With Magnet Ring Synchro 20 Amp Alternator FLYWHEEL ASSEMBLY KEY 3 4 Includes Ring Gear 134 2768 1 Standard 134 277Q 1 With Magnet Ring Phelon 12 Amp Alternator 134 2769 1 With Magnet Ring Synchro 20 Amp Alternator REF NO PART NO 11 526 0262 12 850 0055 13 104 0170 QTY USED 1 1 1 PART DESCRIPTION 15 134 2433 134 2384 16 821 0010 17 821 0014 Washer Flat Steel 7 16 Washer Lock Steel 7 16 Screw S...

Page 315: ...I N G S L E E V E C R A N K S H A F T REAR 101 0420 1 Standard 101 0420 02 1 002 Undersize 101 0420 10 1 010 Undersize 101 0420 20 1 020 Undersize 101 0420 30 1 030 Undersize REF PART NO NO 13 104 0575 QTY USED PART DESCRIPTION AR 101 0415 1 PLATE BEARING R 101 0439 1 101 041 7 1 101 0405 509 0041 516 0072 NUT HEX 104 0091 104 0091 WASHER FLAT 526 0063 2 1 4 5 20 526 0250 20 526 0251 5 526 0066 2 ...

Page 316: ...17 1 110 0068 2 STUD CYLINDER HEAD MOUNTING 520 0717 8 520 0773 12 BEARING SLEEVE PART DESCRIPTION Clamp Loop Breather Tube Cap Screen Breather Tube Seal O Ring Breather Tube Gasket Valve Guide Intake 3 8 x 1 7 8 3 8 x 2 5 16 FLANGED CRANKSHAFT 101 0432 1 Standard 101 0432 02 1 002 Undersize 101 0432 10 1 010 Undersize 101 0432 20 1 020 Undersize 101 0432 30 1 030 Undersize 104 0776 AR Shim 005 Cr...

Page 317: ...8 30 8 RING SET PISTON 113 0165 113 0165 05 113 0165 10 113 0165 20 113 0165 30 113 0165 40 Standard 002 Undersize 010 Undersize 020 Undersize 030 Undersize Standard 005 Oversize 010 Oversize 020 Oversize 030 Oversize 040 Oversize Parts Included in Piston and Pin Set t Parts Included in Connecting Rod Assembly CAMSHAFT GROUP REF PART QTY PART NO NO USED DESCRIPTION 1 105 0382 1 Camshaft Includes P...

Page 318: ...0 1 Standard Key 2 150 1436 1 Standard Key 3 150 1451 1 Standard Key 4 150 1453 1 Special Key 2 Side Pull REF NO PART NO 8 150 1187 9 815 0046 10 11 12 13 17 18 19 20 21 22 23 516 0130 510 0008 510 0014 EXTENSION 150 1073 14 150 1268 15 150 0755 16 150 0752 QTY PART USED DESCRIPTION 1 Yoke Governor Shaft 2 Screw Pan Head Steel 8 32 x 3 8 1 Pin Roll 1 Bearing Needle Key 1 3 1 Bearing Ball GOVERNOR ...

Page 319: ...er 12 122 0321 1 Gasket Adapter Mounting 13 122 0323 1 Filter Oil 14 309 0010 1 Switch L o w Oil Pressure REF PART QTY PART NO NO USED DESCRIPTION 15 502 0058 1 Tee Low Oil Pressure Switch Optional 16 193 0198 1 Sender Oil Pressure Optional 17 526 0065 2 Washer Flat Copper 5 16 18 800 0028 2 Screw Hex Head Cap Steel 5 16 18 x 1 19 505 0057 1 Plug Pipe 1 8 20 193 0031 1 Clamp Meter 21 193 0068 1 Ga...

Page 320: ...e Special Electric Choke Muffler Exhaust Gasket Carburetor Mounting Stud Carburetor Mounting Manifold Intake Gasket Intake Manifold Spacer Fuel Pump Key 1 Gasket Fuel Pump Key 1 Bracket Clamp Manual Choke Optional Screw Hex Head Cap 3 8 16 x 1 1 2 Nut Hex Jam 5 16 24 Washer Lock Steel 5 16 Screw Counterbore Cap Steel 1 4 20 x 1 1 4 Screw Hex Head Cap Steel 5 16 18 x 1 Washer Lock Steel 5 16 Adapte...

Page 321: ... 21 141 0203 1 Retainer Seal Manual Choke 22 141 0809 1 Shaft Throttle 23 141 0799 1 Spring Fuel Float 24 141 0281 1 tGasket Carburetor Flange _Included in Repair Kit 141 0814 t Included in Gasket Kit 141 0748 FUEL PUMP PARTS GROUP MECHANICAL TYPE REF PART NO NO 149 1223 2 815 0148 3 815 0147 4 149 0096 5 149 0095 6 149 0582 7 149 0672 8 149 0539 9 149 0675 10 516 0113 11 12 149 0670 13 149 1148 1...

Page 322: ...ket Carburetor Inlet 13 517 0009 1 Plug Button Key 1 2 14 800 0003 2 Screw Hex Head Cap Steel R E F PART QTY PART NO NO USED D E S C R I P T I O N 15 862 0001 2 Nut Hex 1 4 16 853 0013 2 Washer Lock External Tooth Steel 1 4 17 193 0218 1 Panel Instrument Key 1 2 Optional 18 302 0885 1 Meter Time Totalizing Key 1 2 Optional 19 322 0108 2 Light Indicator Key 1 2 Optional 20 821 0010 4 Screw Locking ...

Page 323: ...oil Mounting Spark Plug Cable Electrical Spark Plug Cable Electrical Spark Plug Coil Ignition REF NO 22 PART NO QTY USED LEAD ELECTRICAL 332 0592 336 2271 336 2272 336 2273 336 0794 23 300 0140 24 302 0270 25 302 0060 26 812 0082 2 27 850 0025 2 28 860 0008 2 29 332 1043 1 30 332 0604 1 31 332 1273 1 32 SCREW 813 0100 2 821 0004 2 33 856 0003 2 34 301 3530 1 35 167 0188 1 36 338 0619 1 37 336 2132...

Page 324: ...crew Round Head Cross Recessed Steel 10 32x1 1 4 REF NO 10 11 21 22 23 24 PART NO 850 0030 191 0937 12 821 0004 13 191 0938 14 191 0939 15 321 0010 16 191 1060 17 336 2222 18 336 2236 19 323 0488 20 323 0496 323 0880 323 0879 323 0882 323 0881 QTY PART USED DESCRIPTION 3 fWasher Lock Steel 10 1 tStator Alternator 12 Volt 20 Amp 4 tScrew Hex Locking Head Flanged Steel 10 32 x 5 16 1 tRectifier Curr...

Page 325: ... c r JOR GROUP 1 X 1 3 STANDARD GOVERNOR CONTROLLED AT ENGINE VARIABLE SPEED GOVERNOR CONTROLLED AT ENGINE OPTIONAL VARIABLE SPEED GOVERNOR REMOTE CONTROLLED OPTIONAL 3 9 56 902422 ...

Page 326: ...eel 1 4 Washer Spring Tension Nut Hex Steel 1 4 20 R E F PART QTY PART NO NO U S E D D E S C R I P T I O N 23 815 0199 2 Screw Fillister Head Steel 10 32 x 5 16 24 870 0131 2 Nut Hex with External Lockwasher 10 32 25 152 0190 1 tBracket Control 26 800 0003 2 Screw Hex Head Cap Steel 1 4 20 x 1 2 Key 1 2 27 856 0006 2 Washer Lock External Tooth Steel 1 4 Key 1 2 28 862 0001 2 Nut Hex Steel Zinc Pla...

Page 327: ...HOUSING GROUP 5 8 902424 ...

Page 328: ... Right Side Carburetor Optional Key 1 2 Hood Engine Optional Kev 1 2 REF NO PART NO QTY USED PART DESCRIPTION 14 405 1872 15 818 0150 16 526 0003 17 821 0010 18 134 2755 19 134 2752 20 134 2761 21 134 2763 22 134 2747 23 134 2737 24 517 0021 25 SCREW 809 0059 820 0010 26 870 0106 27 821 0010 28 815 0261 29 821 0010 2 Clip Hood Optional Key 1 2 4 Rivet Drive Optional Kev 1 2 4 Washer Flat Optional ...

Page 329: ...1 191 0752 1 Holder Spring 12 191 0753 1 Bracket Starter Rear Includes Bearing REF PART NO NO 13 191 0754 14 191 0755 15 191 0756 16 191 0757 17 191 0758 18 191 0759 19 191 0760 20 191 0761 21 191 0762 22 191 0763 23 191 0764 24 191 0765 25 191 0766 26 850 0050 27 800 0051 QTY PART USED DESCRIPTION 1 Washer Flat 1 Washer Flat 1 Insulator Disc 4 Brush Starter 4 Spring Helical Compression Brush 2 Bo...

Page 330: ... 4 191 1011 1 Screw Set 14 191 1088 1 Armature Starter 5 191 0987 1 Solenoid Clutch 15 191 0997 1 Washer Insulator Set 6 191 0988 2 Bolt Machine Through 16 191 1005 2 Brush Starter Positive 191 1086 1 Bracket Starter Front Includes Bearing 17 191 1006 1 Holder Brush Includes Parts Marked 3 191 0971 1 Bearing Sleeve Front 18 191 1089 l Coil Field Starter 9 191 0991 1 Stop Retaining Set Pinion Inclu...

Page 331: ...Palnut 1 4 20 Insulator Disc Bimetal Heater Assembly Ring Retaining Terminal Lug Ground Lead Electrical Ground Lead Electrical Solenoid Washer Lock Internal Tooth 5 16 REF PART QTY NO NO USED 19 526 0022 1 20 864 0002 1 21 813 0107 1 22 526 0008 1 23 850 0030 1 24 812 0076 2 25 854 0007 2 26 815 0161 2 153 0429 1 PART DESCRIPTION Washer Flat Steel 5 16 Nut Hex 5 16 18 Screw Round Head Steel 10 32 ...

Page 332: ... 1322 1 Pump Fuel 142 0537 1 Valve Plate Assembly 142 0540 2 Screw Cover 149 1323 1 Gasket Base 142 0541 1 Gasket Valve Plate 142 0545 1 Spring Pump REF NO PART NO 6 149 1326 7 149 1324 8 142 0552 9 142 0555 QTY USED 1 1 1 1 PART DESCRIPTION Cover Pump Base Pump Disc Pump Diaphragm Pump 63 902429 ...

Page 333: ...e Shutoff Plug Pipe 1 8 Elbow Fuel Pump to Fuel Line Cap and Gauge Assembly Fuel Tank Screw Machine Round Head Cross Recessed Steel 10 32 x 1 1 2 Hold down Strap to Bracket Nut Hex 10 32 7 CLUTCH GROUP OPTIONAL EQUIPMENT REF NO 1 2 3 PART NO QTY USED PART DESCRIPTION 90 0171 i Adapter Clutch to Engine 515 0196 1 Key Clutch STUD CLUTCH HOUSING TO ENGINE 520 0738 1 3 8 16 x 4 520 0739 2 3 8 16 x 3 1...

Page 334: ...gs Cone 21 510 0024 1 Race Outer Roller Bearing Cup 22 518 0172 1 Vent 23 505 0007 1 Reducer Pipe 1 4 x 1 8 24 190 0306 2 Gasket Bearing Plate to j Housing Cover 25 800 0007 4 Screw Hex Head Cap Steel 1 4 20 x 1 26 526 0063 4 Washer Flat Copper 1 4 27 805 0009 4 Bolt Hex Head Steel 5 16 18 x 1 28 800 0028 8 Screw Hex Head Cap Steel 5 16 18 x 1 29 526 0045 8 Washer Flat Copper 5 16 30 190 0297 1 Br...

Page 335: ...e control wiring diagrams shipped with each unit should be used for troubleshooting The following drawings are included herein Engine Control Wiring Diagram with options 67 Engine Control Wiring Diagram with Thermo Magnetic Choke 622 0270 68 Wiring Diagram for Flywheel Alternator Phelon 15 Amp 69 Wiring Diagram for Flywheel Alternator Synchro 20 Amp 6 9 902432 66 ...

Page 336: ...S W I T C H S 1 A H T SI METER O l PRESS J R E S W I T C H S 1 A H T S W I T C H i r N l T l O N S3 B R E A K E R i CAP A S S E M B L Y S 4 S I M T C M L C P K O T l T B I 1 C O I L IGNIT ON T l T B I r B L O C K T E R M I N A L S T R I P MAR K t R V R I REGULATOR VOLTAGE Wl J U M P E R S E E N O T E l MOUKTCD RW UD 6UJULP UME EL Gl SYNCHRO 20 AMP ALTERNATOR C J ft WHEN USED CAUTION REGULATOR MI S...

Page 337: ...H o r ENGINE START Z H 3O S0LEi 0 D BATTERY 12 V I f 1 r IGNITION COIL SPARK PLUGS Z 3 MOUNTED ON BLOWER HOUSING C O o BREAKER a CAP ASSY I LOW OiL vv k V USED V H U S E D THERMO CHOKE ci i 5 I ENGINE CONTROL WIRING DIAGRAM WITH THERMO MAGNETIC CHOKE 622 0270 ...

Page 338: ... RU t OFr 1 f l 1 IGNITION C O U I O N I H I 8ESUI AtOR 9 CnFlfS 0LIAGf MOVJNTCO SCHIMO MEL r i rt si I BTI 1 I 1 E5 i 1 1 tl E l I 1 S3 WIRING DIAGRAM FOR FLYWHEEL ALTERNATOR SYNCRO 20 AMP 622 0382 Rer ocs_ BI RTI 2CRI _ E i d i _ C 3 _ _ _ JZ M l k8T NO I f 4 H 1 3 0108 SI S2 J 3 _ Tl _ v _ e r Gl I13 OI0T Ot f R PTION STARTER t SOUNOIO E N6 8ATTCRV I1V RtCHFILK AiSY SPARK PV UO SCNOtR OIL PgLSV...

Page 339: ...5 a copy of which is supplied with each Onan Product These Onan Authorized Service Centers have trained service personnel parts stock and the necessary facilities and tools for the service and repair of Onan equipment Material Allowances Onan will allow credit or furnish free of charge to the Onan Authorized Service Station or his Approved Service Dealer all genuine Onan parts used in a warranty r...

Page 340: ...e future Adequate evidence of this scheduled maintenance must be offered when applying for a warranty claim INSTALLATION Installation is extremely important and all Onan Products should be installed in accordance with the manufacturer s recommendations If the owner experiences any difficulty with such items as mounting ventilation exhaust location fuel lines wiring etc he should immediately contac...

Page 341: ...ONAN1400 73RD AVENUE N E MINNEAPOLIS MINNESOTA 55432 A DIVISION OF ONAN COHPO tATION 3 90243S ...

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Onan NHC Series, Operator'S/Service Manual And Parts Catalog

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