Briggs & Stratton OHV Liquid-Cooled Engines
275429 2LC .1875 Spine3/29/0611:11 AMPage 1Other Briggs & StrattonCommercial Power Repair Manuals:Briggs & Stratton272147 - Single Cylinder OHV Air-Cooled Engines272144 - Vanguard Twin Cylinder OHV Air-Cooled Engines275429 - Vanguard Twin Cylinder OHV Liquid-Cooled EnginesMS-0750 - Vanguard 3-Cylinder OHV Liquid-Cooled Gasoline EnginesMS-1055 - Vanguard 3-Cylinder OHV Liquid-Cooled Diesel EnginesVANGUARD TWIN CYLINDER OHV LIQUID-COOLED ENGINES Quality Starts With AMaster Service Technicianwww.briggsandstratton.comPart No. 275429-1/04BRIGGS & STRATTON CORPORATIONMilwaukee, WI 53201Part No. 275429-1/04 Printed in U.S.A.REPAIR MANUAL Vanguard Twin CylinderOHV Liquid-Cooled Engines
VanguardTM Twin-Cylinder OHV Liquid-Cooled EngineMODEL 4731002 CYLINDER LIQUID COOLED ENGINECOMMERCIAL POWERMANUAL NUMBER: 275429
VanguardTM Twin-Cylinder OHV Liquid-Cooled EngineSAFETY INFORMATIONThe Briggs & Stratton engine is made of the finestmaterial in a state-of-the-art manufacturing facility.Please understand that Briggs & Stratton sells enginesto original equipment manufacturers. It also sells toothers in the distribution chain who may sell to theultimate consumer, an equipment manufacturer, anotherdistributor or a dealer. As a result, Briggs & Stratton doesnot necessarily know the application on which the enginewill be placed. For that reason, carefully read andunderstand the operating instructions of the equipmentbefore you repair or operate.You should also understand that there are equipmentapplications for which Briggs & Stratton does notapprove the use of its engines. Briggs & Stratton enginesare not to be used on vehicles with less than 4 wheels.This includes motor bikes, aircraft products and allterrain vehicles. Moreover, Briggs & Stratton does notapprove of its engines being used in competitive events.FOR THAT REASON, BRIGGS & STRATTONENGINES ARE NOT AUTHORIZED FOR ANY OFTHESE APPLICATIONS. Failure to follow this warningcould result in death, serious injury (including paralysis)or property damage.IN THE INTEREST OF SAFETYThe safety alert symbol ( ) is used to identify safetyinformation about hazards that can result in personalinjury.A signal word (DANGER, WARNING, or CAUTION) is usedwith the alert symbol to indicate the likelihood and thepotential severity of injury. In addition, a hazard symbolmay be used to represent the type of hazard.DANGER indicates a hazard which, if notavoided, will result in death or serious injury.WARNING indicates a hazard which, if notavoided, could result in death or serious injury.CAUTION indicates a hazard which, if notavoided, might result in minor or moderate injury.CAUTION: When this signal word is used without thealert symbol, it indicates a situation that could result indamage to the engine. Prior to work, read and understand the section(s) ofthis manual that pertain to the job. Follow all safetywarnings. Wear suitable eye protection. Prevent accedental starting by removing spark plugwire from spark plug when servicing engine orequipment. Disconnect negative battery terminal ifequipped with electric starting system. Periodically clean engine. Keep governor parts freeof dirt, grass and other debris which can affectengine speed. Always use fresh gasoline. Stale fuel can gumcarburetor and cause leakage. Check fuel lines and fittings frequently for cracks orleaks and replace if necessary.
VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine
VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine
VanguardTM Twin-Cylinder OHV Liquid-Cooled EngineTable Of ContentsMODEL 4731002 CYLINDER LIQUID COOLED ENGINECOMMERCIAL POWER . 1SAFETY INFORMATION . 2IN THE INTEREST OF SAFETY . 2SECTION 1GENERAL INFORMATION . 3ENGINE IDENTIFICATION . 4MAINTENANCE SCHEDULE . 5FUEL AND OIL RECOMENDATIONS . 6CHANGING OIL AND OIL FILTER. 7CHANGE COOLANT . 7CLEANING DEBRIS . 8ADJUST FAN BELT . 8AIR CLEANER MAINTENANCE . 8REPLACE SPARK PLUG . 9CHARGING SYSTEM .23BATTERY INFORMATION .25EQUIPMENTAFFECTING ENGINE OPERATION .26SECTION 3ENGINE DISASSEMBLY .27GENERAL INFORMATION .27REMOVE MUFFLER .27REMOVE RADIATOR .27DISCONNECT FUEL LINES .28REMOVE FAN ASSEMBLY .28REMOVE CARBURETOR .29REMOVE STARTER .30REMOVE INTAKE MANIFOLD .31REMOVE ALTERNATOR .32REMOVE CYLINDER HEADS .32SECTION 2TROUBLESHOOTING . 11GENERAL INFORMATION . 11WILL NOT START . 11STARTER CURRENT DRAW TEST . 12NO LOADSTARTER CURRENT DRAW TEST . 13CHECK CARBURETION . 16FUEL SHUT-OFF SOLENOID . 16FUEL PUMP - GENERAL INFORMATION . 17CYLINDER BALANCE TEST . 18CYLINDER LEAKDOWN TEST . 19REMOVE CRANKCASE COVER .33REMOVE CAMSHAFT .34REMOVE PISTONS, RODS, CRANKSHAFT .34SECTION 4ENGINE OVERHAUL .35CHECK CYLINDER .35BEARINGS .37CRANKSHAFT .38PISTON, RINGS AND CONNECTING RODDISASSEMBLY AND INSPECTION .38CYLINDER HEADINSPECTION AND REPAIR .41CHECKING COOLING SYSTEM . 21OIL PUMP .44CHECK OIL PRESSURE SWITCH . 22REPLACING WATER PUMP SEAL .45CHECK OIL PRESSURE . 23REPLACING STARTER SOLENOID .46Page 1
VanguardTM Twin-Cylinder OHV Liquid-Cooled EngineTable Of ContentsREPLACING PINION GEAR ASSEMBLY . 47CARBURETOR INSPECTION AND REPAIR . 51SECTION 5ENGINE ASSEMBLY . 57SECTION 6FINAL ADJUSTMENTS ANDSPECIFICATIONS . 71GENERAL INFORMATION . 71REMOTE GOVERNOR CONTROLS . 71INSTALL CRANKSHAFT . 57CARBURETOR ADJUSTMENT . 72ASSEMBLEMODEL 473100 SPECIFICATIONS . 75PISTON AND CONNECTING ROD . 57ENGINE HARNESS . 77ASSEMBLE PISTON RINGS TO PISTON . 57INSTALLPISTON AND CONNECTING ROD . 58INSTALL CAMSHAFT . 59INSTALL GOVERNOR GEAR . 59INSTALL CRANKCASE COVER . 59INSTALL STARTER . 60INSTALL ALTERNATOR . 60INSTALL FLYWHEEL . 61INSTALL CYLINDER HEADS . 61INSTALL ROCKER ARMS . 61ADJUST VALVE CLEARANCE . 62INSTALL ARMATURES . 62INSTALL FAN ASSEMBLY . 63INSTALL INTAKE MANIFOLD . 64INSTALL CARBURETOR AND INTAKE ELBOWASSEMBLY . 64ADJUST GOVERNOR . 66INSTALL MUFFLER . 66INSTALL RADIATOR . 67INSTALL AIR CLEANER ASSEMBLY . 67Page 2
VanguardTM Twin-Cylinder OHV Liquid-Cooled EngineSection 1 - General InformationSECTION 1 GENERAL INFORMATIONBRIGGS & STRATTON NUMERICAL IDENTIFICATION SYSTEMThis chart explains the unique Briggs & Stratton numerical model designation system. It is possible to determine most of the importantmechanical features of the engine by merely knowing the model number. Here is how it works: A. The first one or two digits indicate the approximate CUBIC INCH DISPLACEMENT. B. The first digit after the displacement indicates the BASIC DESIGN SERIES, relating to cylinder construction, ignition, generalconfiguration, etc. C. The second digit after the displacement indicates ORIENTATION OF CRANKSHAFT. D. The third digit after the displacement indicates TYPE OF BEARINGS, and whether or not the engine is equipped withREDUCTION GEAR or AUXILIARY DRIVE. E. The last digit indicates the TYPE OF STARTER.BRIGGS & STRATTON MODEL NUMBERING SYSTEMFirst DigitAfter DisplalcementSecond DigitAfter DisplalcementThird DigitAfter DisplalcementFourth DigitAfter DisplalcementABCDECubic InchDisplacementBasicDesign SeriesCrankshaftOrientationPTO BearingReduction Gear,Auxiliary Drive,LubricationType ofStarter0123456789A to Z0 to 4 - Horizantal Shaft5 to 9 - Verticle ShaftA to G - Horizantal ShaftH to z - Verticle 4243444647525458Example - To Identify Model 303447:0 - Plain Bearing/DUNon-Flange Mount1 - Plain BearingFlange Mount2 - Sleeve BearingFlange MountingSplash Lube3 - Ball BearingFlange MountingSplash Lube4 - Ball BearingFlange MountingPressure Lubrication5 - Plain BearingGear Reduction(6-1) CCW RotationFlange Mounting6 - Plain BearingGear Reduction(2-1) CCW Rotation7 - Plain BearingPressure Lubrication8 - Plain BearingAuxiliary Drive (PTO)Perpendicular toCrankshaft9 - Plain BearingAuxiliary Drive (PTO)Parallel toCrankshaftA - Plain BearingPressure LubricationWithout Oil Filter0 - Without Starter1 - Rope Starter2 - Rewind Starter3 - Electric Starter Only110 or 230 Volt GearDrive4 - Electric Starter/110or 230 Volt GearDrive with Alternator5 - Electric Starter Only12 or 24 Volt GearDrive6 - Alternator Only7 - Electric Starter 12 or24 Volt Gear Drivewith Alternator8 - Verticle Pull Starteror Side Pull Starter9 - Mechanical StarterA - Electric Starter 12 or24 Volt Gear Drivewith Alternator andInverter74Electric StarterHorizantal Shaft12 or 24 Volt Gear DriveFlange Mountingwith AlternatorPressure LubricationTYPE 1234-01 The type number identifies the engine mechanical parts, color of paint, decals, goverened speed and original Equipment Manufacturer.Code 01061201 The code is the manufacturing dat and is read as follows:DAYMONTHYearASSEMBLY LINE AND MANUFACTURING PLANT1206013030 Cubic Inch3Design Series 34Horizantal ShaftPage 3
VanguardTM Twin-Cylinder OHV Liquid-Cooled EngineSection 1 - General InformationENGINE IDENTIFICATIONOil Fill CapFuel PumpDipstickMuffler (If Equipped)Spark PlugChoke Control12V Electric StarterThrottle Control (2 Possible Locations)Oil Drain PlugRadiator Reservoir (If Equipped)Fan Belt (If Equipped)Oil FilterFuel FilterOil Drip Tray (Igf Equipped)Radiator Drain Plug (If Equipped)Oil Pressure SwitchRadiator Screen & Handle (If Equipped)Engine Model LabelRadiator & Radiator Cap (If Equipped)Air Cleaner (If Equipped)Fig. 1Page 4MODELxxxxxxTYPExxxx xxCODExxxxxxxx
VanguardTM Twin-Cylinder OHV Liquid-Cooled EngineSection 1 - General InformationMAINTENANCE SCHEDULEDailyCheck OilLevelXCheck For OilLeaksX50 Hours100 HoursChange OilX*Change OilFilterX*250 Hours600 HoursYearlyCheckCoolantChangeCoolantXX***XCheck FanBeltX**Clean AirFilterX**Replace AirFilterCheck ValveClearanceXCheckBatteryElectrolyteXChangeSpark PlugsXChange FuelFilterClean SparkarrestorXXChange oil after first 50 hours of use, then every100 hours or every season. Change oil every 50hours when operating the engine under heavy load orinhigh temperatures.****If an extended life coolant is used, interval may beincreased to once every 3000 hours.Clean more often under dusty conditions or whenairborne debris is present. Replace air cleanerparts, if very dirty.**Page 5
VanguardTM Twin-Cylinder OHV Liquid-Cooled EngineSection 1 - General InformationFUEL AND OIL RECOMENDATIONSGasolineUse clean, fresh, unleaded gasoline. Leaded gasolinemay be used if unleaded is not available. A minimum of85 octane is recommended. The use of unleadedgasoline results in fewer combustion deposits and longervalve life.We do not recommend the use of gasoline that containsalcohol, such as gasohol. However, if used, it must notcontain more than 10 percent Ethanol and must beremoved from the engine during storage. Do not usegasoline that contains Methanol.Only purchase a 30-day supply of gasoline. Freshgasoline minimizes gum deposits and also will ensurefuel volatility tailored for the season in which the enginewill be operated.NOTE: The use of a fuel additive, such asBriggs & Stratton Gasoline Additive (#5041) orequivalent, will minimize the formation of fuelgum deposits during storage. Such an additivemay be added to the fuel tank or storagecontainer.LubricationOil has four purposes. It cools, cleans, seals andlubricates. During normal operation, small particles ofmetal from the cylinder walls, pistons, bearings andcombustion deposits will gradually contaminate the oil.Dust particles from the air also contaminate the oilforming an abrasive mixture which can cause wear to allof the internal moving parts of the engine, if the oil is notchanged regularly. Fresh oil also assists in cooling. Oldoil gradually becomes thick and loses its cooling abilityas well as its lubricating qualities.Oil RecommendationsUse a high quality detergent oil classified “For ServiceSF, SG, SH, SJ” or higher. Briggs & Stratton stronglyrecommends the use of synthetic oil such as Briggs &Stratton (#100074) or equivalent. If synthetic oil is notavailable, Briggs & Stratton non-synthetic 30 weight oil(#100005 or #100028) is an acceptable substitute. Nospecial additives should be used with recommended oils.Do not mix oil with gasoline.Page 6SAE Viscosity GradesCAUTION: The use of non-synthetic multiviscosity oils (5W-30, 10W-30, etc.) intemperatures above 405 F (45 C) will result inhigher than normal oil consumption. When usinga multi-viscosity oil, check oil level morefrequently.SAE 30 oil, if used below 405 F (45 C), willresult in hard starting and possible engine boredamage due to inadequate lubrication.Lubrication SystemBriggs & Stratton Vanguard liquid cooled OHV VTwins use a full pressure lubrication system with an oilfilter. The gear driven oil pump draws oil from a screenedoil pickup and pumps the oil through the oil filter.The filtered oil flows through oil galleries in the cylinderand crankcase cover and is distributed through thecrankshaft to the main bearings and connecting rodbearings. Engine oil pressure will vary with oil viscosity,ambient air temperature differences, operatingtemperatures and engine load. Follow the oilrecommendation shown above.Oil Pressure - @ 705 F (215 C): 10 50 psi(0.7 3.5 Bar)A pressure relief valve limits the maximum oil pressure inthe system.The engine may be equipped with an oil pressure switchwhich may be used to activate a warning device if oilpressure drops below approximately 8 psi (.55 Bar). Thewarning device is supplied by the equipmentmanufacturer.
VanguardTM Twin-Cylinder OHV Liquid-Cooled EngineSection 1 - General InformationCHANGING OIL AND OIL FILTER9. Replace oil fill cap and dipstick.10. Start and run engine to check for oil leaks.Change oil and filter after first fifty (50) hours ofoperation.Thereafter, change oil and filter every one hundred (100)hours of operation. Change oil more often if engine isoperated in dirty or dusty conditions or if engine isoperated under heavy loads or in high ambient airtemperatures.CHANGE COOLANTCoolant should be replaced every year, unless anapproved extended life coolant is used. Then replaceevery 3000 hours.Oil Capacity: Approximately 87 oz. (2.6 liters) with filter.NOTE: A 50/50 mixture of phosphate-freePlace equipment so that engine is level.antifreeze and tap water is required for properheat dissipation, rust resistance and lubrication.1. Remove oil drain plug and drain oil while engine isstill warm.2. Install and torque drain plug to 20 ft. lbs. (27 Nm).3. Remove oil filter and clean mounting surface.4. Lightly oil new filter gasket with engine oil.5. Screw filter on by hand until gasket contacts oilfilter adapter. Tighten 1/2 to 3/4 turn more.6. Clean area around oil fill cap, then remove oil fillcap and add 67 ounces (2 liters) of oil.7. Start and run engine at idle for 60 seconds. Then,shut engine off and wait 60 seconds.8. Add more oil slowly to bring oil level to FULL markon dipstick. Do Not Overfill.NOTE: Overfilling can cause a smoking oroverheating condition due oil foaming.Oil FilterCAUTION: Used coolant is a hazardous wasteproduct. Dispose of used coolant properly.Check with your local authorities, service center,or dealer for safe disposal/recycling facilities.1. Remove drain plug. As coolant is running out,open radiator cap to allow any trapped coolant todrain. Replace drain plug.OIL DRAIN PLUGOIL FILL2. Remove reservoir bottle, drain it and reinstall.3. Fill radiator to bottom of filler neck and betweenFULL and LOW in reservoir. Replace radiator cap.DIP STICKFULL4. Start and run engine for 30 seconds.5. Shut engine off and allow it to cool. Recheckcoolant levels in radiator and reservoir.6. Coolant level in reservoir bottle should bebetween FULL and LOW when engine is cold.Fig. 2Page 7
VanguardTM Twin-Cylinder OHV Liquid-Cooled EngineSection 1 - General InformationNormal coolant temperature gauge (if equipped) shouldread between 175 and 195 F (80 and 90 C) whenengine is running.If coolant temperature rises above 220 F (105 C), thetemperature light (if equipped) will illuminate. Idle enginedown for a while. Then stop engine. Once engine iscooled, check coolant level, fan belt tension and cloggedradiator fins.1. Loosen boltand bolt.2. Fit torque wrench in the square hole located in thebracket.3. Apply 115 in. lbs. of torque in the direction of thearrow.4. While belt is being tensioned per step 3, torqueboltto 125 in. lbs. (14 Nm). Torque boltto110 in. lbs. (12 Nm).CLEANING DEBRISDaily or before every use, clean accumulated debrisfrom engine. Keep linkage, springs and controls clean.Keep area around and behind muffler free of anycombustible debris.TORQUEWRENCHUse the handle on the radiator screen to lift off forcleaning. Clean screen thoroughly and clean radiatorfins.Do not use water to clean engine parts. Water couldcontaminate fuel system. Low pressure compressed airmay be used. Be careful not to damage radiator fins.CAUTION: Engine parts should be kept cleanFAN BELTTORQUEWRENCHto reduce the risk of overheating and ignition ofaccumulated debrisSQUARETORQUEHOLEFAN BELTRADIATORHANDLEFig. 4CLEANDEBRISAIR CLEANER MAINTENANCECLEAN DEBRISFig. 3ADJUST FAN BELT Check condition of fan belt. Replace if damaged or worn.To Adjust Fan Belt TensionPage 8WARNING: Never operate engine with aircleaner assembly or air cleaner cartridgeremoved.A properly serviced air cleaner protects internal parts ofthe engine from dirt and dust particles in the air. If aircleaner instructions are not carefully followed, dirt anddust which should be collected in the cleaner will bedrawn into the engine. These particles are highlyabrasive and will cause the piston rings and cylinder
VanguardTM Twin-Cylinder OHV Liquid-Cooled EngineSection 1 - General Informationbore to wear quickly. As the rings and cylinder borebecome worn, these abrasive particles enter thecrankcase and contaminate the oil, forming an abrasivemixture which will cause wear on all of the internalmoving parts.Clean cartridge every
275429 - Vanguard Twin Cylinder OHV Liquid-Cooled Engines MS-0750 - Vanguard 3-Cylinder OHV Liquid-Cooled Gasoline Engines MS-1055 - Vanguard 3-Cylinder OHV Liquid-Cooled Diesel Engines Quality Starts With A Master Service Technician Other Briggs & Stratton Commercial Power Repair Manuals: Vanguard Twin Cylinder OHV Liquid-Cooled .
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