Briggs & Stratton Vanguard 10V300 Repair Manual Download Page 31

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SECTION 4 – REMOVE EXTERNAL ASSEMBLIES

REMOVE EXTERNAL ASSEMBLIES -------------------------------------------------------------------------------------------------------- 26

6:1 Gear Reduction Unit ---------------------------------------------------------------------------------------------------------------34
Integrated 2:1 Gear Reduction Unit ------------------------------------------------------------------------------------------------ 34
Non Integrated 2:1 Gear Reduction Unit ------------------------------------------------------------------------------------------35

Not for

Reproduction

Summary of Contents for Vanguard 10V300

Page 1: ...ision A BRIGGS STRATTON LLC CUSTOMER EDUCATION Milwaukee WI 53201 USA Copyright 2020 All rights reserved VANGUARDPOWER COM Vanguard Single Cylinder OHV Air Cooled Engine Repair 10V300 12V300 REPAIR MA...

Page 2: ...N o t f o r R e p r o d u c t i o n...

Page 3: ...time of publication Briggs Stratton LLC reserves the right to change alter or otherwise improve the product or the product manuals at any time without prior notice Briggs Stratton offers two compleme...

Page 4: ...00 MODEL 12V300 NOTE Some models have limited service parts Review the Illustrated Parts List for part availability before conducting any service work NOTE The images in this document are representati...

Page 5: ...EMBLY and then proceed to SECTION 6 SERVICE ENGINE SUBASSEMBLIES CYLINDER HEAD When cylinder head service is complete see SECTION 7 ASSEMBLE ENGINE TOP END ASSEMBLY Bottom End Service If servicing bot...

Page 6: ...N o t f o r R e p r o d u c t i o n...

Page 7: ...3 TROUBLESHOOTING SPECIAL TOOLS 3 SECTION 4 REMOVE EXTERNAL ASSEMBLIES 4 SECTION 5 DISASSEMBLE ENGINE 5 SECTION 6 SERVICE ENGINE SUBASSEMBLIES 6 SECTION 7 ASSEMBLE ENGINE 7 SECTION 8 INSTALL EXTERNAL...

Page 8: ...N o t f o r R e p r o d u c t i o n...

Page 9: ...AFETY 4 Safety Alert Symbol and Signal Words 4 Hazard Symbols and Meanings 4 General Safety Messages 4 GENERAL INFORMATION 7 Engine Identification 7 Fuel Recommendations 7 High Altitude 7 Oil Recommen...

Page 10: ...at pertain to the job Follow all safety warnings Always use fresh gasoline Stale fuel can cause gum deposits in the carburetor and cause leakage flow restrictions or other problems Check fuel lines an...

Page 11: ...fuel to spill Disconnect spark plug wire When Storing Fuel or Equipment with Fuel In Tank Store away from furnaces stoves water heaters clothes dryers or other appliances that have pilot lights or oth...

Page 12: ...lement traumatic amputation or laceration Before performing adjustments or repairs Disconnect the spark plug wire and keep it away from the spark plug Disconnect battery at negative terminal only engi...

Page 13: ...creased performance increased fuel consumption and increased emissions Contact a Briggs Stratton Authorized Service Dealer for high altitude adjustment information Operation of the engine at altitudes...

Page 14: ...range expected Engines on most outdoor power equipment operate well with 5W 30 Synthetic oil For equipment operated in hot temperatures Vanguard 15W 50 Synthetic oil provides the best protection N o...

Page 15: ...rrester 12 Change 6 1 Gear Reduction Oil If Equipped 13 Check Change Non Integrated 2 1 Gear Reduction Oil If Equipped 13 Clean Replace Air Filter 14 Clean Replace Low Profile Air Filter If Equipped 1...

Page 16: ...and debris from around the dipstick tube 4 See Figure 2 Remove dipstick A and wipe with a clean lint free cloth NOTE Proceed to step 10 if only checking engine oil level 5 Remove oil drain plug s with...

Page 17: ...ntact with spark plug terminal 2 See Figure 3 Remove hex flange nut A to release trim panel B from inside carburetor mounting stud 3 Remove hex flange screw C to release trim panel and air cleaner bas...

Page 18: ...5 If stamped guard A remove three screws B to release muffler deflector C and spark arrester D C If wire guard E remove single screw F to release muffler deflector spark arrester G D Clean spark arre...

Page 19: ...of oil fill vent plug is facing outside 9 Dispose of used oil at a proper waste disposal or recycling center 6 7 Check Change Non Integrated 2 1 Gear Reduction Oil If Equipped 1 Remove spark plug wir...

Page 20: ...Look for cuts tears holes or general deterioration Replace duckbill air valve if damaged or missing IMPORTANT NOTE Engine operation without the duckbill air valve can reduce filter efficiency by as mu...

Page 21: ...Install spark plug wire onto spark plug terminal 11 Clean Replace In Tank Fuel Filter 1 Start and run engine until fuel tank is empty 2 Remove spark plug wire from spark plug terminal Secure spark pl...

Page 22: ...ey switch panel onto fuel tank studs 23 Place fuel tank onto engine 24 Install hex flange screw to fasten fuel tank to crankcase flange Tighten screw to 75 95 lb in 8 5 10 7 N m 25 On opposite side in...

Page 23: ...s Do not use a pressurized water spray as water intrusion can contaminate both oil and fuel systems and lead to corrosion 1 Remove spark plug wire from spark plug terminal Secure spark plug wire to pr...

Page 24: ...Make a second mark 1 4 inch 6 mm above the first E Rotate engine in the same direction until the second mark on the wooden dowel is even with the machined surface at the top of the spark plug hole Rem...

Page 25: ...ROUBLESHOOTING SPECIAL TOOLS TROUBLESHOOTING 20 Check Ignition 20 Check Carburetion 21 Check Compression 21 Check Low Oil Sensor System 22 Check Breather Valve 22 SPECIAL TOOLS 23 N o t f o r R e p r...

Page 26: ...more of the following Perform these checks in the order listed 1 Ignition 2 Carburetion 3 Compression Check Ignition 1 Move to step 2 if engine does not start If engine runs but misses move to step 9...

Page 27: ...r fuel lines or fuel tank Carburetor float needle valve stuck closed Inoperative fuel pump if equipped Inoperative fuel shut off solenoid if equipped NOTE To determine if the fuel is getting to the co...

Page 28: ...ep if meter reads infinity 7 See Figure 20 Connect one place wire connector between oil sensor module and oil sensor in crankcase F 8 Disconnect one place wire connector between oil sensor module and...

Page 29: ...uge Part No 19485 10 Dial Bore Gauge Part No 19487 11 Leakdown Tester Part No 19545 12 Master Seat Cutter Kit Part No 19547 13 Spark Plug Wrench Part No 19576S 14 Digital Tachometer Hour Meter Part No...

Page 30: ...3 24 N o t f o r R e p r o d u c t i o n...

Page 31: ...ed 28 Fuel Tank 28 Fuel Pump Hoses If Equipped 30 Engine Cover 30 Muffler 31 Control Bracket Governor Lever 31 Carburetor 32 Rewind Starter 32 Blower Housing 33 Low Oil Sensor Module If Equipped 33 Ar...

Page 32: ...A C Direct free end of tubing into an approved container D Position throttle lever fuel valve to ON and loosen float bowl drain screw B E When fuel tank has drained completely position throttle lever...

Page 33: ...Remove and discard foam spacer if damage or general deterioration is evident 6 Remove two hex flange nuts G to release bracket H from standoffs I 7 Remove two standoffs from carburetor studs 8 Remove...

Page 34: ...from starter motor black white wire terminal G 8 See Figure 27 Remove bottom starter motor screw H to release flywheel guard I and starter motor from crankcase 9 Remove bottom blower housing screw J t...

Page 35: ...isassembly would be required to retrieve it 3 Raise and remove fuel tank 4 If equipped remove key switch panel C from fuel tank studs Disconnect key switch harness connector from key switch 5 Squeeze...

Page 36: ...y remove other end from pulse pump fitting E D Remove two hex flange screws F to release fuel pump G from bracket H Engine Cover NOTE Remove engine cover if equipped with remote fuel tank 1 See Figure...

Page 37: ...ite end of governor idle spring from slot in governor lever I 6 Remove inside hex flange screw J to release control bracket from crankcase fuel tank flange 7 Remove outside hex flange screw K to relea...

Page 38: ...ide nut in a counter clockwise direction until stud is loose E Remove stud from cylinder head Remove hex flange nuts from stud F Repeats steps 1 B thru 1 E to remove second stud 2 Draw fuel hose B out...

Page 39: ...crankcase side is removed with starter motor regulator 36 Low Oil Sensor Module If Equipped NOTE If engine is equipped with electric start oil sensor module is removed with starter motor regulator 1...

Page 40: ...o clock positions 8 Remove four hex flange screws I to release gear case from crankcase cover 9 Remove gasket J from crankcase cover Discard gasket 40 Integrated 2 1 Gear Reduction Unit 1 See Figure 4...

Page 41: ...from clutch housing Discard gasket 5 Remove two locating pins G from clutch housing flange if loose 6 Remove crankshaft screw H and lock washer I from engine crankshaft 7 Remove clutch J chain K and...

Page 42: ...4 36 N o t f o r R e p r o d u c t i o n...

Page 43: ...5 37 SECTION 5 DISASSEMBLE ENGINE TOP END DISASSEMBLY 38 BOTTOM END DISASSEMBLY 40 N o t f o r R e p r o d u c t i o n...

Page 44: ...lease heat shield E from cylinder head NOTE A second hex flange screw was removed with the blower housing while a third screw was removed with the control bracket 4 Thoroughly clean exterior surfaces...

Page 45: ...take valve begins to open B When the intake valve closes so that both valves are closed with the rocker arms loose insert a wooden dowel through the spark plug hole until seated at the top of the pist...

Page 46: ...3 See Figure 44 Remove flywheel nut A from crankshaft 4 Remove starter cup B and flywheel fan C 5 Obtain Flywheel Puller Part No 19203 and remove flywheel D from crankshaft Proceed as follows A Instal...

Page 47: ...ing CAUTION The edges of the crankshaft keyway are sharp Wear appropriate safety gloves and exercise care to avoid hand injury 9 Remove key G from keyway on crankshaft taper 10 Remove high mount dipst...

Page 48: ...en the engine is assembled 16 Rotate crankshaft until piston is at the bottom of its stroke 17 See Figure 50 Use a plastic scraper to carefully remove carbon ridge at top of cylinder bore NOTE Failure...

Page 49: ...nkshaft from crankcase 22 See the following topics under SECTION 6 SERVICE ENGINE SUBASSEMBLIES PISTON AND CONNECTING ROD FLYWHEEL CRANKSHAFT AND CAMSHAFT CRANKCASE AND CRANKCASE COVER N o t f o r R e...

Page 50: ...5 44 N o t f o r R e p r o d u c t i o n...

Page 51: ...uds 51 Assembly 51 PISTON AND CONNECTING ROD 53 Disassembly 53 Cleaning 54 Piston 54 Connecting Rod 54 Inspection 54 Piston and Pin 54 Piston Rings 55 Connecting Rod 55 Assembly 56 FLYWHEEL CRANKSHAFT...

Page 52: ...glaze Recondition Cylinder Bore 62 Hone Resize Cylinder Bore 62 Clean Crankcase and Cylinder Bore 63 Assembly 63 Crankcase 63 MAG Bearing Oil Seal 63 Low Oil Sensor If Equipped 64 Governor Crank 65 Cr...

Page 53: ...n on valve spring retainer G to disengage from valve stem groove Guide valve stem into larger offset hole in valve spring retainer and then relieve valve spring tension as shown in Figure 52 C Remove...

Page 54: ...ny low spot is 0 002 inches 0 05 mm or more Proceed as follows A See A of Figure 54 With the combustion chamber side facing up set a straightedge diagonally across the length of the cylinder head gask...

Page 55: ...intake valve stem using an outside micrometer Replace the intake valve if any measurement is 0 209 inches 5 319 mm or less 6 Measure the top center and bottom of the exhaust valve stem Replace the ex...

Page 56: ...til it is approximately 0 047 0 063 inches 1 19 1 59 mm wide E Use low pressure compressed air to thoroughly remove all cutting chips and metal shavings Remove pilot from valve guide F Lap the valve f...

Page 57: ...valve A assembly as follows 59 A Apply a suitable engine assembly lube to the valve stem NOTE If the valves were not tagged during disassembly remember that the exhaust valve always has the smaller v...

Page 58: ...ve stem and guide hand spin the valve as it is installed Work the valve back and forth in the bore to verify that it slides smoothly and seats properly E Using a suitable degreaser thoroughly clean va...

Page 59: ...UTION Always wear proper eye protection when removing compression and oil wiper rings Slippage may propel the ring with enough force to cause eye injury 4 See Figure 61 Remove compression ring from th...

Page 60: ...or cracks Pay special attention to the area around the pin bores and oil drain back holes beneath the piston crown B Check piston for cracked broken or bent ring lands 63 C Check piston skirt for crac...

Page 61: ...piston A Obtain new top compression ring B See Figure 65 Insert ring approximately one inch 25 4 mm into cylinder bore C Square ring in the bore using the top of the piston D Measure the ring end gap...

Page 62: ...Do not reuse piston pin lock ring after it has been removed The lock ring may weaken or become distorted during removal causing it to break or dislodge during engine operation 4 Install new piston pin...

Page 63: ...life on valves and other components 10 Carefully install the compression ring B into the top ring groove so that the single painted mark is to the right of the ring end gap 11 Rotate piston rings usi...

Page 64: ...ly remove crankshaft end play shims A if present Count shims as they are removed to be sure of installing the correct number when the engine is assembled Inspect shims for tears holes or other damage...

Page 65: ...y that it returns to the fully CLOSED position when released 3 Check camshaft lobes C for scratching scoring or excessive wear 4 Check MAG bearing journal D and PTO bearing journal E for scratching or...

Page 66: ...e to avoid scratching bearing bore during removal 2 With the outside facing upward support crankcase cover on wooden blocks on deck of arbor press 3 Place suitable bearing driver on outer race of bear...

Page 67: ...oceed as follows A See A of Figure 77 Set a straightedge diagonally across the length of the cylinder intersecting the upper and lower corners of the gasket surface B Slide a feeler gauge beneath the...

Page 68: ...chuck of portable variable speed drill and tighten 5 Using a suitable honing oil liberally lubricate cylinder bore and finishing stones 6 Hone cylinder bore using a drill speed of approximately 200 R...

Page 69: ...size use finishing stones to achieve the final size and produce the correct cross hatch pattern See Deglaze Recondition Cylinder Bore steps 3 7 NOTE An improper cross hatch pattern or too fine a hone...

Page 70: ...the outside facing upward support crankcase on wooden blocks on deck of arbor press 12 Apply a thin film of clean engine oil to oil seal bore and OD of new oil seal 13 Verify that oil seal lip garter...

Page 71: ...spring clip through hole in governor crank C so that it points toward the MAG bearing side Be sure that crooked leg faces away from the governor idle bracket screw boss D 7 Verify that governor crank...

Page 72: ...led Non Integrated 2 1 Open Side Faces Out See B of Figure 88 6 1 Open Side Faces Out See B of Figure 88 88 12 If oil seal is required support crankcase cover on wooden blocks on deck of arbor press w...

Page 73: ...7 67 SECTION 7 ASSEMBLE ENGINE BOTTOM END ASSEMBLY 68 TOP END ASSEMBLY 73 N o t f o r R e p r o d u c t i o n...

Page 74: ...ailable 8 Carefully install crankshaft into crankcase positioning MAG bearing journal in MAG bearing 90 91 9 Verify that crankshaft gear meshes with governor gear 10 Remove oil seal protector sleeve o...

Page 75: ...ylinder bore then retract the piston reset the piston ring compressor sleeve and try again 92 93 15 With connecting rod positioned on crank pin journal install connecting rod cap so that the match mar...

Page 76: ...Crankcase cover must be installed within five minutes of liquid gasket application If time limit is exceeded scrape off liquid gasket and reapply 29 Install oil seal protector sleeve on crankshaft NO...

Page 77: ...y is 0 004 0 014 inches 0 12 0 35 mm or 0 004 0 012 inches 0 12 0 30 mm if engine is used in a pump application H Repeat the procedure to verify the reading 97 98 I If end play is not within specifica...

Page 78: ...ghtly without wobbling 100 43 Install flywheel fan E onto flywheel so that the deeper indentation at the back fits over the flywheel magnet NOTE Rotate flywheel fan slightly to ensure that two large p...

Page 79: ...18 N m using the sequence shown C Final tighten screws to 132 244 lb in 14 9 27 6 N m using the sequence shown NOTE Failure to step torque screws in the proper sequence may result in gasket leaks or c...

Page 80: ...Plug Wrench Part No 19576S NOTE Do not install spark plug wire onto spark plug terminal at this time 107 17 See Figure 107 Install two hex flange screws A to fasten cylinder heat shield B to cylinder...

Page 81: ...81 Muffler 83 Fuel Pump Hoses If Equipped 85 Fuel Tank 85 Engine Cover 86 Starter Motor Regulator If Equipped 86 Air Cleaner 87 Low Profile Air Cleaner If Equipped 88 Gear Reduction Unit If Equipped...

Page 82: ...n flywheel and armature legs To set air gap to 0 010 0 014 inches 0 25 0 35 mm loosen bottom hex flange screw G to allow magnet to pull armature legs H against gauge 110 7 See Figure 111 Tighten botto...

Page 83: ...g B to crankcase and engine base Exercise care to avoid pinching stator and or armature wires 2 Using the sequence shown in inset alternately tighten screws to 80 110 lb in 9 12 4 N m Verify that bott...

Page 84: ...ely tighten three hex flange screws to 25 35 lb in 2 8 4 N m Replace Rewind Starter Rope 1 See Figure 116 Pull rope part way out and tie a temporary knot A 2 Remove insert B from handle C 3 Pull knot...

Page 85: ...ribbed side faces inside toward the cylinder head D Install carburetor adapter gasket F onto carburetor mounting studs so that tab on gasket is at the bottom with the company logo facing outside NOTE...

Page 86: ...O rings and fuel hose as these can be damaged by the carburetor cleaner 2 Inspect carburetor body and float bowl for sediment gum or varnish deposits Spray parts and then wipe away cleaning solution w...

Page 87: ...re not pinched as screw is tightened 2 Install governor link C into grommet in governor lever with the hooked end pointing down 3 Install opposite end of governor link D into hole in throttle lever wi...

Page 88: ...er tightening as shown in Figure 122 19 Verify that hook end of main governor spring is pointing down and then insert trombone end under control bracket to engage slots on high speed adjustment tang Q...

Page 89: ...irt with a soft bristle brush and a portable hand held vacuum C Gently scrape away stubborn accumulations of dirt and other deposits using a plastic putty knife or stiff bristle brush D Apply a light...

Page 90: ...arrester as follows A Orient muffler deflector as noted before removal NOTE Muffler deflector is installed in either the 9 o clock or the optional 6 o clock position B If stamped guard start three scr...

Page 91: ...to the fuel tank inspect the external surface area for light that would indicate the presence of pin holes or small cracks 7 Install filler neck filter and fuel cap 8 See Figure 126 Inspect in tank fu...

Page 92: ...40 60 lb in 4 5 6 8 N m 127 Starter Motor Regulator If Equipped 1 See Figure 128 Install two locating pins A into threaded holes in crankcase 2 With the stator wires routed over the top of the starte...

Page 93: ...lenoid housing Air Cleaner 1 Wash air cleaner cover air cleaner base and duckbill air valve in warm soapy water or use a soft bristle brush and a portable hand vacuum to remove all dust and dirt 2 See...

Page 94: ...the float bowl vent is blocked See top inset of Figure 133 3 Install breather hose to port on air cleaner base Verify that tab on valve cover side of breather hose is at the top as shown in Figure 132...

Page 95: ...ith the adhesive side in contact with the air cleaner cover 18 Inspect foam seal P for damage or general deterioration Install foam seal into air cleaner cover Verify that ends of seal do not overlap...

Page 96: ...onto installed screws so that the sealing bead faces the crankcase cover 7 Slide gear case over crankshaft and hand tighten screws into crankcase cover 8 Insert two remaining hex flange screws through...

Page 97: ...counterbore E Apply a thin film of clean engine oil to oil seal bore and outside diameter of new oil seal F With the open lip garter spring side facing in press on outside edge of oil seal until flus...

Page 98: ...g conditions Parts are oriented and stacked correctly as shown at bottom of Figure 136 All friction disks are installed on the sprocket shaft splines Keyway on the sprocket shaft is aligned with the k...

Page 99: ...8 93 136 N o t f o r R e p r o d u c t i o n...

Page 100: ...terminal 5 Start and run engine Check for oil and fuel leaks while engine is running Set Idle and Top No Load Speeds 1 Obtain the Top No Load Speed for the engine Proceed as follows A Dealers See www...

Page 101: ...et to set top no load speed value obtained in step 1 12 Stop engine and remove Digital Tachometer and Hour Meter Remote Control Remove the air cleaner See SECTION 4 REMOVE EXTERNAL ASSEMBLIES AIR CLEA...

Page 102: ...able into either hole C in bellcrank 4 Loosen hex screw D and capture cable sheath in casing clamp E Tighten screw NOTE Use the internal T25 TORX recess for best results 5 Exercise the throttle contro...

Page 103: ...R CLEANER in this section 142 5 Remove top hex flange screw on rewind starter Install screw capturing casing clamp bracket F Tighten screw to 25 35 lb in 2 8 4 N m 6 Install Z fitting of cable into ho...

Page 104: ...8 98 N o t f o r R e p r o d u c t i o n...

Page 105: ...9 99 SECTION 9 SPECIFICATIONS SPECIFICATIONS 100 Engine Specifications 100 Torque Specifications 100 Standard Reject Sizes 102 N o t f o r R e p r o d u c t i o n...

Page 106: ...5 6 8 N m Armature Screw 20 35 lb in 2 3 4 N m Blower Housing Screw 80 110 lb in 9 12 4 N m Breather Cover Screw 53 62 lb in 6 7 N m Breather Valve Screw 25 35 lb in 2 8 4 N m Carburetor Stud 70 90 l...

Page 107: ...w 70 90 lb in 7 9 10 2 N m 6 1 Gear Reduction Gear Case Screw 175 225 lb in 19 8 25 4 N m 6 1 Gear Reduction Gear Case Cover Screw 175 225 lb in 19 8 25 4 N m 6 1 Gear Reduction Gear Case Cover Plug 1...

Page 108: ...mm 1 099 in 27 925 mm or less MAG Bearing Journal Diameter 0 984 in 24 982 mm 0 981 in 24 925 mm or less PTO Bearing Journal Diameter 0 984 in 24 982 mm 0 981 in 24 923 mm or less CAMSHAFT MAG Bearing...

Page 109: ...9 103 This page is intentionally left blank N o t f o r R e p r o d u c t i o n...

Page 110: ...9 104 This page is intentionally left blank N o t f o r R e p r o d u c t i o n...

Page 111: ...N o t f o r R e p r o d u c t i o n...

Page 112: ...ision A BRIGGS STRATTON LLC CUSTOMER EDUCATION Milwaukee WI 53201 USA Copyright 2020 All rights reserved VANGUARDPOWER COM Vanguard Single Cylinder OHV Air Cooled Engine Repair 10V300 12V300 REPAIR MA...

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Briggs & Stratton Vanguard 10V300, Repair Manual

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