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WM 90 Repair

Reassembly Procedures

wc_tx000389gb.fm

8.3

Reassembling Piston

See Graphic: wc_gr001874, wc_gr001899 and wc_gr001900

Install each piston ring in the correct groove of the piston by widening
it enough to slide it over the piston.

Note: When installing the piston rings, make sure not to twist the rings
too much as they may become damaged.

8.3.1

Install the three-piece oil ring (c) first. When installing the oil ring, install
the middle section first, then the outer two outer sections.

8.3.2

Install the second ring (b). When installing the second ring, make sure
that the “RN” mark is face up.

8.3.3

Install the top ring (a).

wc_gr001874

wc_gr001899

wc_gr001900

Содержание WM 90

Страница 1: ...www wackergroup com Engine WM 90 REPAIR MANUAL 0160157en 002 0207 0 1 6 0 1 5 7 E N...

Страница 2: ......

Страница 3: ...the documents please contact Wacker Corporation to order a replacement Damage caused by misuse or neglect of the unit should be brought to the attention of the operator to prevent similar occurrences...

Страница 4: ...qualified and rated by the United States Forest Service for this purpose In order to comply with local laws regarding spark arresters consult the engine distributor or the local Health and Safety Adm...

Страница 5: ...Data 23 3 1 Specifications 23 3 2 Performance 24 4 Theory of Operation 25 4 1 Application 25 4 2 Recommended Fuel 25 4 3 Before Starting 25 4 4 To Start 26 4 5 To Stop 27 4 6 Component Descriptions 2...

Страница 6: ...Cover 49 7 9 Removing Camshaft and Tappets 50 7 10 Removing Connecting Rod and Piston 51 7 11 Removing Crankshaft 52 7 12 Removing Intake and Exhaust Valves 53 8 Reassembly Procedures 54 8 1 Notes on...

Страница 7: ...e Carburetor 75 9 6 Carburetor Disassembly Procedure 78 9 7 Carburetor Inspection 79 9 8 Carburetor Reassembly 79 9 9 Carburetor Adjustments 80 10 Recoil Starter 81 10 1 Recoil Starter Disassembly 81...

Страница 8: ...scribing the operation and maintenance of emission control systems The following instructions and procedures must be followed in order to keep the emissions from your Wacker engine within the emission...

Страница 9: ...Remember that this schedule is based on the assumption that your machine will be used for its designed purpose Sustained high load or high temperature operation or use in unusually wet or dusty condit...

Страница 10: ...equipped to conform at the time of initial sale to all applicable regulations of the U S Environmental Protection Agency EPA and that the engine is free of defects in materials and workmanship which...

Страница 11: ...ent unless they were made by the service dealer authorized by Wacker during a warranty repair alteration accident failure to use the recommended fuel and oil or not performing required maintenance ser...

Страница 12: ...ANCE REPLACEMENT OR REPAIR OF EMISSION CONTROL DEVICES AND SYSTEMS MAY BE PERFORMED BY ANY REPAIR ESTABLISHMENT OR INDIVIDUAL HOWEVER WARRANTY REPAIRS MUST BE PERFORMED BY A SERVICE DEALER AUTHORIZED...

Страница 13: ...follow this symbol to avoid possible injury or death DANGER indicates a hazardous situation which if not avoided will result in death or serious injury WARNING indicates a hazardous situation which i...

Страница 14: ...ded by Wacker Damage to equipment and injury to the user may result 2 1 5 NEVER leave machine running unattended 2 1 6 NEVER tamper with or disable the function of operating controls 2 1 7 NEVER use c...

Страница 15: ...g Internal Combustion Engines Internal combustion engines present special hazards during operation and fueling Read and follow the warning instructions in the engine owner s manual and the safety guid...

Страница 16: ...engine is flooded or the smell of gasoline is present A stray spark could ignite the fumes 2 3 7 DO NOT use gasoline or other types of fuels or flammable solvents to clean parts especially in enclose...

Страница 17: ...WM 90 Repair Safety Information wc_si000143gb fm 17 2 4 Label Locations...

Страница 18: ...molded in label contains important safety and operating information If it becomes illegi ble the cover must be replaced Refer to the Parts Book for ordering information DANGER Engines emit carbon mono...

Страница 19: ...filtered gasoline fuel WARNING Hot surface WARNING Serious injury if struck by compressed spring or cover If the spring system cover is removed improperly the springs can eject Guaranteed sound power...

Страница 20: ...nit Please record the infor mation found on this plate so it will be available should the nameplate become lost or dam aged When ordering parts or requesting ser vice information you will always be as...

Страница 21: ...Operating Labels Wacker machines use international pictorial labels where needed These labels are described below Label Meaning Turn the engine switch to the ON position Close the choke Pull the rewi...

Страница 22: ...Information WM 90 Repair wc_si000143gb fm 22 Throttle control lever Turtle Idle or Slow Rabbit Full or Fast Fuel valve Closed Open Engine stop button Press to stop engine Choke 0 Open l Closed Label M...

Страница 23: ...BM4A or BMR4A Electrode Gap mm in 0 6 0 7 0 023 0 028 Cylinder Head Compression cold kg cm2 psi 8 0 9 7 120 140 Air Cleaner type Three stage with cyclonic precleaner Engine Lubrication oil grade SAE...

Страница 24: ...hnical Data WM 90 wc_td000143gb fm 24 3 2 Performance Ref Description Ref Description a Maximum torque d Recommended horsepower range b Continuous rated horsepower e Output c Maximum horsepower f Torq...

Страница 25: ...ther structures 4 2 Recommended Fuel This engine is certified to operate on automotive unleaded gasoline Use only fresh clean gasoline Gasoline containing water or dirt will damage fuel system 4 3 Bef...

Страница 26: ...starts 4 4 5 On engines equipped with the low oil shutoff switch see section Low Oil Shutoff Switch for additional information Note First time use engines recently serviced run out of fuel or not use...

Страница 27: ...cylinder liner made of special cast iron is molded into the aluminum casting The crankcase has a mounting sur face on the output shaft side where the main bearing cover is attached The main bearing c...

Страница 28: ...nd carries two compression rings and one oil ring The piston rings are made of special cast iron The profile of the top ring and the second ring are shown in the illustration The oil ring is a three p...

Страница 29: ...ve area for optimum cooling Reference intake a exhaust b The cylinder head is an aluminum die casting which utilizes wedge type combustion cham ber for high combustion efficiency The governor is a cen...

Страница 30: ...rotating and sliding parts are splash lubricated by the oil splasher a on the con necting rod The ignition system is a transistor controlled magneto system which consists of a flywheel a and an ignit...

Страница 31: ...matic decompression mechanism a that opens the exhaust valve before the piston reaches maximum compression is assembled on the camshaft for easy starting During engine operation the decompression syst...

Страница 32: ...Theory of Operation WM 90 wc_tx000388gb fm 32 4 7 Cross Section Across Shaft wc_gr001884 2 3 7 8 8 9 9 10 11 12 13 1 1...

Страница 33: ...ents See Graphic wc_gr001884 Ref Description Ref Description 1 Cylinder head 9 Main bearing cover 2 Piston pin 10 PTO shaft 3 Ignition coil 11 Piston ring 4 Blower housing 12 Piston 5 Recoil starter 1...

Страница 34: ...Theory of Operation WM 90 wc_tx000388gb fm 34 4 9 Cross Section Along Shaft 1 4 10 14 g...

Страница 35: ...ft Components See Graphic wc_gr001885 Ref Description Ref Description 1 Push rod 9 Stiffener 2 Carburetor 10 Plug 3 Air cleaner 11 Oil gauge 4 Tappet 12 Connecting rod 5 Camshaft 13 Spark plug 6 Gover...

Страница 36: ...aks Check engine oil Check fuel level Check for loose hardware Clean debris from engine Change engine oil Clean air cleaner Check and clean spark plug Check and adjust valve clearances Remove carbon d...

Страница 37: ...place the elements if they are damaged 5 2 2 Main paper filter element b Replace the main paper filter element if it appears heavily soiled 5 2 3 Prefilter c Clean the prefilter with low pressure comp...

Страница 38: ...ly 5 3 2 Remove fuel line from fuel flow valve a 5 3 3 Unscrew fuel filter assembly b from tank 5 3 4 Clean filter with parts cleaning solvent 5 3 5 Inspect gasket c and filter for damage and replace...

Страница 39: ...k 5 4 2 Start the engine and run it until remaining fuel is used 5 4 3 Remove the spark plug Pour approximately 30 ml 1 oz of clean SAE 10W30 engine oil into the cylinder through the spark plug openin...

Страница 40: ...ent information refer to the Parts Book originally supplied with the machine If the original Parts Book has been lost a replacement may be ordered from Wacker Corporation When ordering a replacement P...

Страница 41: ...ove the M8 x 16 bolt and washer d securing the guard to the engine 7 1 6 Remove the M8 bolt and washer e securing the guard to the rammer crankcase 7 1 7 Remove the six M8 bolts f securing the lower g...

Страница 42: ...Disassembly Procedures WM 90 Repair wc_tx000389gb fm 42 d e j f wc_gr001954 b l a c k wc_gr003661...

Страница 43: ...nmental protection place plastic sheeting and a container under the machine to collect the liquid which drains off Dispose of this liquid properly 7 2 1 Remove the drain plug a and gasket b 7 2 2 Remo...

Страница 44: ...fm 44 7 3 Removing Recoil Starter and Blower Housing See Graphic wc_gr003650 7 3 1 Remove the bolts a and remove the recoil starter b from the housing 7 3 2 Remove the flange bolts f cap screw g and...

Страница 45: ...bly Procedures wc_tx000389gb fm 45 7 4 Removing Muffler See Graphic wc_gr001888 7 4 1 Remove the flange nuts a 7 4 2 Remove the flange bolts b 7 4 3 Remove the bolts and washers c and remove the muffl...

Страница 46: ...e the governor lever c 7 5 3 Remove the governor rod d and the rod spring e and if necessary bushing f 7 5 4 Remove the carburetor flange g the gaskets h the carburetor i 7 5 5 Remove the bolts j secu...

Страница 47: ...e the ignition coil c 7 6 3 Remove the M12 nut and washer d four M6 bolts e and remove the starter pulley f and flywheel g If necessary break the nut loose by tapping the handle of the wrench with a h...

Страница 48: ...7 1 Remove the four M6 x 60 bolts a and remove the rocker cover b and gasket c 7 7 2 Remove the breather d gaskets e and spacer f 7 7 3 Remove the two M8 x 55 bolts g and the two M8 bolts h remove th...

Страница 49: ...fm 49 7 8 Removing Bearing Cover See Graphic wc_gr001893 7 8 1 Remove the nine M6 x 30 bolts and washers a and remove the main bearing cover b Note If necessary use a rubber mallet c and tap the cover...

Страница 50: ...es WM 90 Repair wc_tx000389gb fm 50 7 9 Removing Camshaft and Tappets See Graphic wc_gr001894 7 9 1 Lay crankcase on the flywheel side and push the tappets a into the crankcase and remove the camshaft...

Страница 51: ...r push out connecting rod d and piston assembly through top of cylinder Note Scrape off all carbon deposits that might interfere with removal of piston from upper end of cylinder 7 10 3 Remove the cli...

Страница 52: ...Procedures WM 90 Repair wc_tx000389gb fm 52 7 11 Removing Crankshaft See Graphic wc_gr001896 7 11 1 To remove the crankshaft a tap lightly on flywheel end of the crankshaft with a rubber mallet b a b...

Страница 53: ...e procedure is the same for removing each valve 7 12 1 Remove pivot bolt a rocker arm b and nut c 7 12 1 Press down the spring retainer d take out the collet e and then remove spring retainer and valv...

Страница 54: ...o the lip Replace them if damaged Apply oil to lip before re assembling Replace all gaskets with new ones Replace keys pins bolts and nuts with new ones if necessary Tighten nuts and bolts to the spec...

Страница 55: ...he piston Note When installing the piston rings make sure not to twist the rings too much as they may become damaged 8 3 1 Install the three piece oil ring c first When installing the oil ring install...

Страница 56: ...res WM 90 Repair wc_tx000389gb fm 56 8 4 Reassembling Piston and Connecting Rod See Graphic wc_gr001901 8 4 1 Install the piston a onto the connecting rod b using the piston pin c and two clips d d d...

Страница 57: ...he piston rings in and lower the piston into the cylinder Note If you do not have a ring guide hold the piston rings in with your fingers while tapping lightly on the piston head with a block of wood...

Страница 58: ...fully to avoid damage during camshaft b installation 8 6 2 Remove spacer c to allow viewing of timing mark 8 6 3 Lubricate the bearing surfaces of camshaft Align the timing marks d on the camshaft wi...

Страница 59: ...A Distance from main bearing cover mating surface a to the inner race of the ball bearing b 8 7 2 Measure the depth B Distance from the crankcase mating surface c to the crankshaft gear d B A side cle...

Страница 60: ...with engine oil 8 8 2 Coat the mating surfaces of the main bearing cover a and crankcase b with Loctite 515 Gasket Eliminator or equivalent 8 8 3 Using nine M6 x 30 bolts and washers c secure the mai...

Страница 61: ...ld be replaced when valve stem clearance exceeds specifications See Clearance Data and Limits Table 8 9 4 Draw valve guides out and press new guides in See Clearance Data and Limits Table 8 9 5 After...

Страница 62: ...appens removal of the main bearing cover will be necessary to remove them 8 10 2 Place the gasket b on the crankcase Position the intake valve c and the exhaust valve d into the cylinder head e Using...

Страница 63: ...enter of the compression stroke by matching the alignment mark on the flywheel a with the alignment mark on the crankcase b 8 11 3 Loosen the nut c under the rocker arm Position a feeler gauge e as sh...

Страница 64: ...r is removed 8 12 1 Using four M6 bolts a secure the rocker cover b and gasket c to the cylinder head 8 12 2 Remove any carbon deposits from the spark plug and inspect the electrode for damage Replace...

Страница 65: ...ywheel center hole 8 13 2 Install the flywheel M12 nut and washer to the crankshaft Hold the flywheel using a strap wrench and torque the nut to 44 2 49 1 Nm 32 5 36 2 ft lbs 8 14 Installing Ignition...

Страница 66: ...sher o pivot bolt n spacer r and return spring q 8 15 4 Attach the governor spring c to proper holes as marked during disassembly of governor lever and speed control lever 8 15 5 Using bolts j install...

Страница 67: ...g c and carburetor throttle valve is fully open 8 16 3 Turn the governor shaft d clockwise all the way using a screw driver and tighten the lock bolt to secure the lever on the shaft 8 16 4 Loosen the...

Страница 68: ...fm 68 8 18 Installing Blower Housing and Recoil Starter See Graphic wc_gr003650 8 18 1 Install the blower housing h using the flange bolts f and cap screw g 8 18 2 Install the recoil starter b to the...

Страница 69: ...wire from the low oil unit l if equipped to the engine 8 19 3 Using six M8 bolts f mount the guards to the engine Secure upper guard to engine using M8 x 16 bolt d and to rammer crankcase using M8 bo...

Страница 70: ...Reassembly Procedures WM 90 Repair wc_tx000389gb fm 70 d e j f wc_gr001954 b l a c k wc_gr003661...

Страница 71: ...urfaces and running clearances between the various parts can only be established by operating the engine under reduced speed and loads for a short period of time Run in the engine according to the sch...

Страница 72: ...volution when the flywheel reaches the ignition point the low speed ignition timing control circuit operates to run the base current I3 to turn the signal transistor A ON allowing the current I1 to by...

Страница 73: ...tion 1 Low speed ignition timing circuit 9 Spark plug 2 Signal transistor A 10 Ignition timing BTDC 3 Automatic advancing control circuit 11 Engine revolution rpm 4 Signal transistor B 12 Step advanci...

Страница 74: ...ightly to release compression The release lever has a flyweight c on one end and a crescent cam d on the other When the engine is cranked the crescent cam projects above the cam profile and lifts up t...

Страница 75: ...en submitted to a positive pressure 6 Inlet screen The inlet screen filters the fuel that is drawn from the fuel tank to the carburetor 7 Inlet needle valve The inlet needle valve controls the fuel th...

Страница 76: ...fuel when the engine is at idling speeds and when the throt tle is at low speed position 17 High speed needle The high speed needle has the function of controlling the fuel when the engine is operatin...

Страница 77: ...WM 90 Repair Sub Systems wc_tx000390gb fm 77 9 12 11 7 17 20 6 4 5 2 19 18 3 1 8 15 14 16 13 10 wc_gr001919...

Страница 78: ...d remove the screw and the pump cover 13 9 6 2 Remove the pump gasket 12 and the diaphragm 11 9 6 3 Place the carburetor with the metering side up and remove the metering cover screws 8 9 6 4 Remove t...

Страница 79: ...heck the throttle shaft 19 and the choke shaft 20 for smooth operation 9 7 6 Check the inlet screen 1 for dirt If the screen is dirty wash it and blow it out with compressed air 9 7 7 Check the inlet...

Страница 80: ...ust screw 15 so that the engine is running at a speed slightly lower than the speed at which the clutch engages High Speed Adjustment 9 9 2 Set the throttle valve 16 to the fully open position and che...

Страница 81: ...down firmly with both thumbs taking care to not allow it to spring back Note The following procedure requires the help of an assistant 10 1 4 Remove the knot from the reel untie the knot and pull the...

Страница 82: ...1831 Remove the reel 10 1 8 Hold down the reel f gently to keep it from escaping from its case and rotate it slowly back and forth by quarter turns until it moves smoothly 10 1 9 Lift the reel up slig...

Страница 83: ...ouches the rib of the bearing 10 1 13 Hold the reel in such a way that the inner end of the spring hooks onto the shaft hook c and then place the reel carefully back into the case See Graphic wc_gr001...

Страница 84: ...ss the rope through the rope guide and the rope hole of the reel and pull through approximately 20 cm 7 3 4 in out of the reel 10 1 20 Tie a knot in the end of the rope 10 1 21 Put the rope into the r...

Страница 85: ...the reel the spring may be over stressed To fix this pull out the starter rope approximately 30 cm 11 3 4 and controlling the rotation of the reel with your thumb allow the starter rope to rewind abou...

Страница 86: ...numbers 0009386 rev 112 and higher 0009340 rev 112 and higher 0620051 rev 108 and higher Ref Description Ref Description 1 Starter assembly 8 Spring 2 Rope 9 Ratchet wheel 3 Handle 10 Cover 4 Wear pla...

Страница 87: ...ted or twisted Check that the starter return spring ends are bent 180 a The starter return spring may be difficult to seat in the slots on the starter housing and the rope reel pulley if the return sp...

Страница 88: ...ecting between the spring windings avoid using grease to lubricate the tarter return spring or the inside of the reel where the spring seats Use a light lubricating oil such as WD40 instead 10 6 3 Ins...

Страница 89: ...assembly from the flywheel housing 10 7 2 Lift the rope through the notch a in the drum Pull out as much of the rope as possible Hold the rope and let the spring pull the drum around clockwise until a...

Страница 90: ...Recoil Starter WM 90 Repair wc_tx000627gb fm 90 wc_gr002882 a d e b c...

Страница 91: ...ists the dimension of the part as new from the factory The Limit column lists the maximum allowance If the measurement exceeds the Limit dimension listed replace or repair the part Item Standard mm in...

Страница 92: ...Oversize 0 50 51 47 51 49 2 0264 2 0272 51 38 2 0228 Ring groove side clearance Top 0 035 0 080 0 0014 0 0031 0 15 0 006 2nd 0 035 0 080 0 0014 0 0031 0 15 0 006 Oil Ring 0 010 0 065 0 0004 0 0026 0 1...

Страница 93: ...g 0 05 0 25 0 002 0 010 1 5 0 0591 Cylinder Inner diameter Standard STD 51 000 51 019 2 008 2 009 To be rebored when the differ ence between max and min diameter reaches 0 1 0 004 First reboring 51 25...

Страница 94: ...7874 0 7879 20 1 0 7913 Clearance between large end and crank pin 0 037 0 063 0 0015 0 0025 0 2 0 008 Small end inner diameter 11 010 11 021 0 4335 0 4339 11 08 0 4362 Clearance bewteen small end and...

Страница 95: ...1 0 0 04 Crankshaft Crank pin outer diameter 19 950 19 963 0 7854 0 7859 19 85 0 7815 Journal outer diameter D1 and D2 19 988 19 997 0 7869 0 7873 Camshaft Cam peak height intake and exhaust 18 3 18 5...

Страница 96: ...stem outer diameter Intake 5 440 5 455 0 2142 0 2148 5 35 0 2106 Exhaust 5 426 5 444 0 2136 0 2143 5 35 0 2106 Clearance between valve stem and valve guide Intake 0 045 0 078 0 0018 0 0031 0 3 0 0118...

Страница 97: ...134 0 3140 Guide inside diameter 8 00 8 015 0 3150 0 3140 Tappet guide clearance 0 025 0 055 0 0010 0 0022 Valve seat angle intake and exhaust Valve cutter angle a Valve contact width b a 90 b 0 8 1 1...

Страница 98: ...Clearance Data and Limits Table WM 90 Repair wc_tx000391gb fm 98 Valve spring free length 26 7 1 05 Item Standard mm in Limit mm in wc_gr001947...

Страница 99: ...her factors as well that will make engine starting difficult such as a heavy load on the engine when attempting to start or heavy back pressure due to a long exhaust pipe 12 2 Troubleshooting Procedur...

Страница 100: ...rnal engine is completely dry because of a long period of storage 12 2 3 2 Loose or broken spark plug This causes a hissing noise made by the fuel air mixture running out of the cylinder in compressio...

Страница 101: ...icted 12 2 6 5 Cooling air path misdirected causing loss of cooling efficiency 12 2 6 6 Cylinder head cooling fins clogged with dirt 12 2 6 7 Engine being operated in an enclosed space without suffici...

Страница 102: ...Troubleshooting WM 90 Repair wc_tx000393gb fm 102 Notes...

Страница 103: ...5 ml 17380 50 ml Loctite 271 277 Hernon 427 Omnifit 1550 220M Red High strength for all threads up to 25 mm 1 Heat parts before disassembly Temp range 54 to 149 C 65 to 300 F 29312 5 ml 26685 10 ml 7...

Страница 104: ...ts follow instructions on container The sealants listed are recommended for use on Wacker equipment TYPE Europe COLOR USAGE PART NO SIZE Loctite 496 Hernon 110 Omnifit Sicomet 7000 Clear Instant adhes...

Страница 105: ...5 M4 2 9 26 4 1 36 4 9 43 7 9 32 3 M5 6 0 53 8 5 6 10 7 8 5 16 4 M6 10 7 14 10 17 13 10 5 M8 25 18 35 26 41 30 13 1 2 6 M10 49 36 69 51 83 61 17 11 16 8 M12 86 63 120 88 145 107 19 3 4 10 M14 135 99 1...

Страница 106: ...8 2 5 22 3 5 31 4 7 42 9 11 32 9 64 No 10 3 6 32 5 1 45 6 8 60 3 8 5 32 1 4 8 1 6 12 9 16 12 7 16 3 32 5 16 18 13 26 19 33 24 13 1 2 1 4 3 8 31 23 45 33 58 43 9 16 5 16 7 16 50 37 71 52 94 69 16 5 8...

Страница 107: ......

Страница 108: ...02 0 Fax 49 0 89 3 54 02 3 90 Wacker Corporation P O Box 9007 Menomonee Falls WI 53052 9007 Tel 262 255 0500 Fax 262 255 0550 Tel 800 770 0957 Wacker Asia Pacific Operations Skyline Tower Suite 2303 2...

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