Wisconsin VH4D Engine Complete Workshop Service Repair Manual

FOREWORD Good operation anda planned maintenance program as outlined in this manual are vital in obtainingmaximum engine performance and long engine life. Theinstructions on the following pages have been written with this in mind, to give the operatora better understanding of the various problems whichmay arise, andthe manner in which these problems canbest be solved or avoided. The operator is cautioned against the use of any pans, other than genuineWisconsin parts, for replacement or repair. These panshavebeen engineered andtested for their particular job, andthe useof any other pans may result in unsatisfactoryperformance and short engine life. Wisconsin distributors and dealers, because of their close factory relations, canrender the best and most efficient service. THE LIFE OF YOUR ENGINE DEPENDS ON THE CARE IT RECEIVES. The MODEL, SPECIFICATION and SERIALNUMBER of your engine must be given when ordering pans. The MODEL and SPECIFICATION number are on the name plate. The SERIAL NUMBER is stamped either on the crankcase or the engine’sidentification tag. Copy the MODEL, SPECIFICATION and SERIAL NUMBER in the spaces provided below so that it will be availablewhen ordering pans. MODEL SPECIFICATION SERIAL NUMBER To insure prompt and accurate service, the following information must also be given: 1. State EXACTLY the quantity of each pan and pan number. 2. State definitely whether pans are to be shipped by express, freight or parcel post. 3. State the exactmailing address.

IMPORTANT READTHESE INSTRUCTIONSCAREFULLY All pointsof operation and maintenance have been covered as carefully as possible, but if further information is required, send inquiries to the factory for prompt attention. When writing to the factory, ALWAYS GIVE THE MODEL, SPECIFICATION AND SERIAL NUMBER of the engine referred to. Startin_o andODeratin_o New Engines Careful breaking-in of a new engine will greatly increase its life and result in troublefree operation. A factory test is not sufficient to establish the polished bearing surfaces, which are so necessary to the properperformance and long life of an engine. These can only be obtained by runninga new engine carefully andunder reduced loads for a short time. ¯ Be surethe engine is filled to the proper level with a good quality engine oil. ¯ For proper procedures to follow when breaking-in a new engine, see ’Testing Rebuilt Engine’. The various bearing surfaces in a new engine have not been glazed, as theywill be with continued operation, and it is in this period of "running in" that special caremust be exercised, otherwise the highly desired glaze will neverbe obtained. A new bearing surface that has oncebeen damaged by carelessness will be ruined forever.

IMPORTANT SAFETY NOTICE Proper repair is important to the safe and reliable operation of an engine. This Repair Manual outlines basic recommended procedures, some of whichrequire special tools, devicesor work methods. Improper repair procedures can be dangerous andcould result in injury or death. READ AND UNDERSTAND ALL SAFETY PRECAUTIONS AND WARNINGS BEFORE PERFORMING REPAIRS ON THIS ENGINE Warning labels have also been put on the engines to provide instructions and identify specific hazards which,if not heeded, couldcause bodily injury or death to youor other persons. These labels identify hazardswhich may not be apparentto a trained mechanic. Thereare many potential hazards for an untrained mechanic and there is no way to label the engine againstall suchhazards. These warnings in the RepairManual and on the engine are indentified by this symbol: z WARNING Operations that may result only in engine damage are identified in the RepairManual by this symbol: CAUTION Wisconsin Motors, LLC cannot anticipate every possible circumstance that might involve a potential hazard; therefore, the warnings in this manual are not all inclusive. If a procedure, tool, deviceor work method not specifically recommended by Wisconsin is used, you must satisfy yourself that it is safe for you and others. You should also ensure that the engine will not be damaged or made unsafe by the procedures you choose. IMPORTANT: Theinformation, specifications andillustrations in this manual are based on information that wasavailable at the time it waspublished. The specifications, torques, pressures of operation, measurements, adjustments, illustrations and other items can changeat any time. These changescan affect the service given to the product. Get the complete and most current information before starting any job. For parts, service, or information, contract Wisconsin Motors, LLC, Memphis, Tennessee.

SAFETY PRECAUTIONS ¯ Never fill fuel tank whileengine is running or hot; avoid thepossibilityof spilledfuel causing a fire. ¯ Always refuel slowly to avoid spillage. ¯ When starting engine,maintain a safe distance from moving parts of equipment. ¯ Donot start engine with clutch engaged. Donot spin hand crank when starting. Keep cranking components clean and free from conditions which mightcause the crankjaw to bind andnot release properly. Oil periodically to prevent rust. ¯ Never run engine with governor disconnected, or operate at speeds in excess of 2800 R.P.M. load. Do not operate engine in a closed building unless the exhaust is piped outside. Thisexhaust contains carbon monoxide, a poisonous, odorlessand invisible gas,which if breathed causes serious illness and possible death. Never make adjustments on machinery while it is connected to the engine, without first removing the ignition cable from the spark plug. Turning the machinery over by hand during adjusting or cleaning might start the engine and machinery with it, causing serious injury to theoperator. ¯ Precaution is the bestinsurance against accidents. Keep this book handy at all times, fanzilia~ize yourself with the operating i~.¢~ctio~s. Model VH4D 3-1/4" Bore m 3-1/4" Stroke 107.7 cu. in. Displacement 2

EXHAUST MUFFLER P RE-CLEANER AIR CLEANER CARBURETOR FUEL PUMP FUEL PUMP PRIMER HANDLE AIR VENT HOLE FUEL TANK CAP-----~ OIL FILLER AND BREATHER CAP GASOLINE STRAINER OIL SABER ~AGNETO STOP SWITCH MAGN ETO OIL FILTER TAKE.OFF (Side Mount Tank) VIEW OF ENGINE AIR VENT HOLE FUEL TANK CAP ~ MUFFLER FUEL TANK OIL FILLER AND BREATHER CYLINDER NUMBERS AIR CLEANER CHOKE BUTTON VARIABLE SPEED GOVERNOR CONTROL IGNITION SWITCH FLYWHEEL SHROUD OIL FILTER E TO OIL DRAIN PLUG POWER UNIT FAN END VIEW OF ENGINE F~g.1 MODEl VH4D OPEN ENGINE AND POWER UNIT

NOTE: CYLINDERS, RINGS, PISTONS, PINS, TAPPETS, VALVES, CAMSHAFT, BEARINGS AND ETC. ARE LUBRICATED BY THE OIL SPRAY OR MIST THROWN OFF THE CONNECT- ING RODS AND CRANKSHAFT. OIL SPRAY NOZZLES OIL STRAINER STANDARD LOCATION OF OIL GAUGE SABER OIL FILLER AND BREATHER CAP CRANKSHAFT OIL SLINGER OIL PRESSURE RELIEF VALVE SET FOR 15 POUNDS PRESSURE OIL HEADER TUBE OPTIONAL LOCATION OF OIL GAUGE SABER FULL AND LOW MARKS ON OIL GAUGE SABER OIL PUMP STRAINER SCREEN OIL FILTER OIL LINE TO GOVERNOR OIL DRAIN PLUG OIL RETURN FROM FILTER INTO CRANKCASE WITH ENGINE AT OPERATING TEMPERATURE, OIL PRESSURE IN HEADER WILL BE APPROXIMATELY 5 POUNDS. AN OIL PRESSURE GAUGE IS NOT REQUIRED.

Wisconsin VH4D Engine Complete Workshop Service Repair Manual

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