I ~I " 1 , J .... ;~,.' ,: ',< ._ ... -, " " " , ,. -. i , " ' , ,) '. , , , . WORLD'S LARGEST BUILDERS O.F HEAVY DUTY AIR COOLED ENGINES -- -. ',~., , ' " -, \ ', . /" BOOK OF INSTRUCTIONS WISCONSIN FOUR CYLINDER ENGINE MODELS VH4, VH4D • 3~" Bore 3~" Stroke 107.7cu. in. Disp. • HOTE, The VH4 engine with STELLITE exhaust valve. and seat inserts has the letter 'D' suffixed to the model designation and is referred to as the Model VH4D. WISCONSIN MOTOR CORPORATION MILWAUKEE 46, WISCONSIN MI-498 INTRODUCTION This manual has been compiled to suit the service requirements of the basic engine and accessories most commonly supplied with engines. Wisconsin Motor Corporation adapts its engines to suit individual customer requirements whenever practical. It evidently would become too involved to include all variations in one manual; therefore, should any problems arise concerning engine servicing, we advise that a Wisconsin distributor or authorized service station be contacted as they are cap• able of identifying all parts by the specification number stamped on the name plate of engine. A listing of approved Wisconsin service stations appears in the back of this manual. Wisconsin heavy duty air cooled engines are of the most advanced design and are built in a modern factory, equipped with the latest machinery available. Only the best materials, most suitable for the particular part, are used. During production every part is subjected to the most rigid inspection, as are also the completely assembled engines. After as• sembly, every engine is operated on its own power for several hours, and all adjustments are carefully made so that each engine will be in perfect operating condition when it leaves the factory. Back of the Wisconsin Motor Corporation is fifty years of engineering experience in the design of gasoline engines for every conceivable type of service. The performance of these engines is proof of the long satisfactory service you too can expect from your engine. Like all fine machinery, the engine must be given regular care and operated "in accord• ance with the instructions. SAFETY PRECAUTIONS Precaution is the best insurance against an accident. Never fill fuel tank while engine is in operation or hot, to avoid the possibility of spilled fuel causing a fire. Never operate engine in a closed building unless the exhaust is piped outside. This exhaust contains carbon monoxide, a poisonous, odorless and in'visible 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 cables from the spark plug. Turning over the machinery by hand during adjusting or cleaning might start the engine, and machinery with it, causing seri- ous injury to the operator. - Keep this book hancly at all times, familiarize yourself with the operating instructions. MI......9 2 INDEX PAGE PAGE Agricultural Engine Instructions 15 Ignition Switch 9 Air Cleaner and Pre-Cleaner 10 Illustration of Engine and Power Unit 4 Battery Ignition - Wiring and Timing Diagram.. 13 Lubrication 7 Bore and Stroke . Lubrication System 7 Carburetor Ad j ustment 11 Lubrication System -lllustration.......................... 6 Carburetor Repair - See Manufacturer's Bulletin Magneto Breaker Point Adjustment 11 in Back of Manual. Magneto Ignition Spark 11 Choke ~............................... 9 Magneto Repair - See Manufacturer's Bulletin Clutch...................................................................... 24 in Back of Manual. Clutch Adjustment :............ 25 Magneto Timing Diagram........................................ 13 Clutch Reduction Unit 25 Magneto Timing 12 Compression . 17 Neon Lamp Timing.................................................. 14 Compression - Restoring . 15 Oi I Filter 10 Cooling ~ . 7 Oil- Grade of 8 Cross Section of Engine . 5 Oi I Pressure 8 • Disassembly and Reassembly . 18 Parts List Section c........................................... 27 Air Shrouding . 18 Camshaft . 23 Reduction Gears 25 Camshaft Gear . 20 Rotation.................................................................... 7 Carburetor and Manifold . 19 Crankshaft . 23 Safety Precautions.................................................. 2 Cylinders . 22 Safety Switch - High Temperature 15 Cylinder Head . 19 Flywheel . 18 Service Station Directory - See Back of Manual. Fuel Tank . 19 Spark Plugs 15 Gear Cover . 20 Id ler Gear and Shaft . 20 Starting and Operating Instructions...................... 7 Oil Pan . 20 Starting and Operation of New Engine - See Oil Pump . 20 Inside of Front Cover. Piston Ring and Rod Clearance Chart . 22 Piston Rings : . 21 Starting - Hand Crank 9 Pistons and Connecting Rods . 21 Stopping Engine- Vapor Lock and Dieseling 9 Distributor - Battery Ignition 12 Storage of Eng ine for Winter 26 Di stributor and Generator Maintenance 15 Testing Rebuilt Engine.......................................... 18 Distributor Timing . 13 Troubles-Causes and Remedies 16 Electric Starter and Generator . 9 Backfiring Through Carburetor 18 Ignition 17 Firing Order ~ . 12 • Knocking 17 Fuel . 8 Missing 17 Overheating........................................................... 17 Fuel Pump . 8 Starting Difficulties............................................ 16 Fuel Strainer . 10 Stops 17 Surging or Galloping 17 General Information and Design . 7 Governor Adjustment . 24 Valves - Grinding and Tolerances........................ 22 Governor - Operation . 23 Valve Tappets 23 Horsepower . 7 Warm-Up Period - Overspeed ing .. 9 3 MI-497-2 P RE·CLEANER -- .... CARBURETOR OIL FILLER AND FUEL PUMP PRIMER HANDL E BREATHER CAP GASOLINE STRAINER FUEL OIL SABER MAGNETO STOP SWITCH FUEL TANK TAKE.OFF (Side Mount Tank) VIEW OF ENGINE AIR VENT HOLE AIR CLEANER FUEL TANK- CHOK E BUTTON VARIABL E SPEE-D GOVERNOR CONTROL OIL FILL ER AND BREATHER CAP CYLINDER NUMBERS FLYWHEEL SHROUD POWERUNIT FAN END VIEW OF ENGINE 218641C-l Fig. 1 2186~2C-l MODEL VH4 OPEN ENGINE AND POWERUNIT MI·499 4 C) ;:) 0:: -' CL CL z « 0:: .a: C('" l) z 10 !J C( 0:: II: «'" '" 0:: I- Ul c 0 Ul 0:::J:'" 0:: "'~ '"z -'0::-'''' -' :::i ;:;:10 '"... 0 ... Ul ;:) « _z-,0 :::E C) 0« ~ 31: 0:: l)'" tn C) • Z 0:: i= i .;, Ul :::E 0 -' ;:) '" 0 N .., it' C) a: N 0 CL 0 ! I- C) Z « CL IL CL I- 0:: « z 0 :::E :::E ... « :J: i= ~ -' ;:) ;:) « ... 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Fig. 3 LUBRICATION SYSTEM MI.SOI 6 GENERAL INFORMATION AND DESIGN HORSEPOWER Wisconsin engines are of the' four cycle type, in which R.P.M. HORSEPOWER each of the four operations of suction, compression, 1400 17.2 expansion and exhaust requires a complete stroke. 1600 20.0 This gives one power stroke per cylinder for each two 1800 22.5 revolutions of the crankshaft. 2000 24.7 COOLING 2200 26.5 Cooling is accomplished by a flow of air, circulated 2400 28.0 over the cylinders and heads of the engine, by a 2600 29.2 combination fan-flywheel encased in a sheet metal 2800 30.0 shroud. The air is divided and directed by ducts and baffle plates to insure uniform cooling of all parts. The horsepower given in the above chart is for an atmospheric temperature of 60° Fahrenheit, at sea Never operate an engine, with any part of the level, and at a Barometric pressure of 29.92 inches shrouding removed, because this will retard the of mercury. air cooling. For each inch lower Barometer reading, deduct 371% CARBURETOR from above horsepower. For each 10° higher temperature, there will be a re• The proper combustible mixture of gasoline and air duction in horsepower of 1%. is furnished by a balanced carburetor, giving correct fuel to air ratios for all speeds and loads. For each 1000 ft. altitude above sea level, there will be a reduction in horsepower of 371%. IGNITION The friction in new engines cannot be reduced to the The spark for ignition of the fuel mixture is furnished ultimate minimum during the regular block test, but by a high tension magneto driven off the timing gears engines are guaranteed to develop at least 85 per at crankshaft speed. The magneto distributor rotor cent of maximum power when shipped from the fac• turns at half-engine speed. The magneto is fitted with tory. The power will increase, as friction is reduced, an impulse coupling, which makes possible a power• during a few days of operation. The engine will ful spark for easy starting. Also, the impulse coupling develop at least 95% of power shown on chart when automatically retards the timing of the spark for start• fl-iction is reduced to a minimum. ing, thus eliminating danger of a kick-back from the For continuous operation, allow 20% of horsepower engine while cranking. When electric starter and gen• shown, as a safety factor. erator is furnished, battery ignition is used. See Page 13. ' INSTRUCTIONS FOR LUBRICATION SYSTEM STARTING AND OPERATING A gear type pump supplies oil to four nozzles which Engines that have a sheet metal house built around it, direct oil streams against fins on the connecting rod as shown in bottom view of Fig.