Engine Model: General Motors 4.3 L Powertrain EPA .

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Service PartsEngineEngine Model:General Motors 4.3 L PowertrainEPA Certified EnginesGenerator Models:25/30REZGB38RCL40/45REZG40/45ERESTP-6730 7/12c

Table of ContentsDescriptionPageIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Number System Significance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Illustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3How to Find Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Hardware References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Model Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41--1: Dipstick . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51--2: Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61--3: Fan Spacer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71--4: Lifting Eye, Idler, Belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81--5: Flywheel Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101--6: Flywheel/Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111--7: Exhaust Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121--8: Exhaust Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131--9: Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141--10: High Voltage Switch (HVS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151--11: Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161--12: Ignition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171--13: Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181--14: Pulley Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191--15: Alternator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202--1: Engine Block/Lower End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222--2: Engine Head/Upper End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

IntroductionThis manual lists service replacement parts for GeneralMotors 4.3L engines.Information in this publication represents data availableat the time of print. Kohler Co. reserves the right tochange this publication and the products representedwithout notice and without any obligation or liabilitywhatsoever.This manual includes the following main sections:Table of Contents. Lists the sections of the manual.Introduction (and other information sections).Contains introductory material about part numbers,illustrations, and hardware.Index. Lists the engine models and groups.Group Parts Lists. List the part numbers of parts in thegroups.Numbering System SignificanceThis manual uses the following numbering systems:Model. The product identification number located onthe nameplate. Engines break down into groups.Group Number. A unique number representing a partsgroup needed to assemble a generator set function. Forexample, Group 1--2 is the Starter group.IllustrationsIllustrations (or exploded-view drawings) bestrepresenting the widest range of variations accompanymost groups in this manual. Illustrations do not depict alldetails and may not show all parts. Do not substituteillustrations for assembly or disassembly.How to Find Part NumbersUse the following steps to locate a service replacementpart.1. Locate the nameplate to identify the modelnumber.2. Turn to the Model Index. The first columnidentifies the groups of parts that make up theengine. The headings identify the models.3. Find the group variation number at theintersection of the group row and the modelcolumn. Note the variation number.4. Page forward to locate the group and variationidentified above or find the appropriate page in theTable of Contents.5. Find the part on the illustration and note the itemnumber of the part or find the part description inthe parts list.Part Number. The part number identifies an individualassembly, subassembly, component, or accessory kit.TP-6730 7/123

Model IndexGroup Description1--1: Dipstick1--2: Starter1--3: Fan Spacer1--4: Lifting Eye, Idler, Belt1--5: Flywheel Adapter1--6: Flywheel/Housing1--7: Exhaust Manifold1--8: Exhaust Pipe1--9: Thermostat1--10: High Voltage Switch (HVS) Coil & Distributor1--11: Electrical1--12: Ignition System1--13: Fuel System1--14: Pulley Assembly1--15: Alternator2--1: Engine Block/Lower End2--2: Engine Head/Upper 04048938041427380503084.3 L4.3 84.3 L4.3 3793804048938041427380503084.3 L4.3 LTP-6730 7/12

1--1: DipstickVariation: 38040051214338040051Item1234Part No.GM75221GM75129GM16117#DescriptionClamp, DipstickTube, DipstickDipstick, oil 4.3LBolt 1/4-20x5/8 Flange Hd SerQty.1111# Common hardware; procure locally.TP-6730 7/125

1--2: StarterVariation: 380403631238040363Item126Part No.GM94038GM17378DescriptionStarterBolt, starterQty.12TP-6730 7/12

1--3: Fan SpacerVariation: 380406221238040622Item12Part No.GM51969GM51970TP-6730 7/12DescriptionSpacer, fanBolt, FanQty.147

1--4: Lifting Eye, Idler, BeltVariation: 38050332425316Item12345678Part 974DescriptionBolt, 3/8-16 x 1 1/2 HxHd Gr 5Washer, 3/8Washer, flat 3/8 SAEBracket, exhaust/lifting eyeSpacer, .75 OD x .38 ID x .50Belt, fan standardBracket, pulleyNut, 3/8-16Items not shown: 8738050332Qty.34413111# Common hardware; procure locally.8TP-6730 7/12

1--4: Lifting Eye, Idler, BeltVariation: 38050356138050356ItemPart No.Description1GM85017Belt, AltTP-6730 7/12Qty.19

1--5: Flywheel AdapterVariation: 380301211238030121Item12Part No.GM75115#DescriptionAdapterBolt, 3/8-16 x 2 Skt Hd Gr8Qty.14# Common hardware; procure locally.10TP-6730 7/12

1--6: Flywheel/HousingVariation: 380402021324Items not shown: 538040202Item12345Part No.GM75116GM75114GM75198##DescriptionHousing, SAE3 UniversalPlate, Cover F/WBolt, M10-1.50 x 30 SkHd Gr8.8Bolt, 1/4-20x1/2 Flange Hd SerBolt, 5/8-18 x 1 HxHd ZincQty.11641# Common hardware; procure locally.TP-6730 7/1211

1--7: Exhaust ManifoldVariation: 3804080251234187See Group 1--8638040802Item12Part 878GM75180GM75179DescriptionManifold, exhaustShield, heat exhaust (1 wire)Shield, heat exhaust (2 wire)Bolt, 3/8-16 x 2 hex hd grade 5Washer, flat 3/8” (hardened)Kit, Exhaust Hardware(includes 3 nut, stud, spring)Gasket, Exh Manifold (dual)Gasket, Exh Manifold (single)Qty.2221212222TP-6730 7/12

1--8: Exhaust PipeVariation: 380408314513238040831Item12345Part No.GM16145GM16208GM16215GM24190#DescriptionClamp, muffler 3”Pipe, YSeal, exhaustWasher, flat 3/8 SAENut, Lock 3/8-16 w/o Nyl InsrtQty.1122238RCLItem23Part No.-GM16215DescriptionPipe (see generator set manual)Seal, exhaustQty.12# Common hardware; procure locally.TP-6730 7/1213

1--9: ThermostatVariation: 38040638123456438040638Item123456Part Bolt, 3/8-16 x 3 1/4 HxHd Gr.5Washer, 3/8Cover, thermostatGasket, water outletThermostat, engine coolingSpacer, thermostat coverQty.221211# Common hardware; procure locally.14TP-6730 7/12

1--10: High Voltage Switch (HVS)Variation: 38040366128534Items not shown: 6, 738040366ItemPart 321#GM90538DescriptionDistributor, HVS Ignition(includes item 8)Yoke, HVS Dist AlignmentCoil, Ignition HVSBracket, Ignition coilWasher, flat 3/8” (hardened)Bolt, M8-1.25 x 20 flange headBolt, 3/8-16x1 Flange Hd SerCamshaft Position Sensor(part of item 1)Qty.11112221# Common hardware; procure locally.TP-6730 7/1215

1--11: ElectricalVariation: 3804037721836754Items not shown: 9, 10, 11, 12, 13, 1438040377Item1234567891011121314Part 38GM75220GM24341GM75103####DescriptionSensor, O2Sensor, coolantSender, oil pressureWasher, flat 3/8” (hardened)Bracket, Lifting EyeIsolator, relay boxHarness Stationary, IEPROil Pressure FittingFittingNut, Flange 1/4-20 SerratedWasher, Star 3/8Bolt, 3/8-16x3/4 Flange Hd SerBolt, 1/4-20x3/8 Flange Hd SerBolt, 3/8-16x1 Flange Hd SerQty.11121211121122# Common hardware; procure locally.16TP-6730 7/12

1--12: Ignition SystemVariation: 380403793154268Items not shown: 738040379Item12345678Part 60#DescriptionRetainer, spark plug wire (3)Retainer, spark plug wireSpark plugRetainer, 1 Wire Spark PlugWires, Spark Plug HVSRetainer, Spark Plug Wire(3)Loom, Split 1/4” 46 in.Bolt, 1/4-20x1/2 Flange Hd SerQty.22661214# Common hardware; procure locally.TP-6730 7/1217

1--13: Fuel SystemVariation: 380404891215162137231198171419142110 1822324Items not shown: 5, 6, 20, 25, 26, 27, 28, 29, 30, 31, 3238040489ItemPart 6GM69507Elbw, PCV sys 5/8 in. 45 deg.Hose, fuel 3/8 in.Hose, fuel 3/8 in.Valve, throttle, 60 mmFitting, 1/8 NPT x 3/8 in.Ftg, 1/8NPT x 3/8 90 deg. elbownylonClamp, hose 3/8 (spring type)Clamp, hose 5/8 (spring type)Adapter, barb 5/8 to 3/8 nylonGasket, man. adapter venturiTube, 0.625 ID x 3 in.EPR assemblyEPR assembly (dual fuel)EPR (38RCL)Throttle adapterAdapter, 4.3L intake to 44mm TBMixer, 4.3L Emissions18Qty.11111142111111111Item Part M16226DescriptionQty.Adapter, EPR, 3/4 NPTSensor, 1 bar TMAPGasket, manifoldElbow, PCVBolt, M6 x 1.0 x 15 skt hd, gr. 8.8Bolt, 5/16-18 x 3/4 skt hd, gr. 5Washer, flat, 1/4Bolt, 1/4-20 x 2 in. skt. hd. gr. 8Bolt, M6 x 1.0 x 16 hx hd, gr. 8.8Bolt, M4 x .70 x 16 sht hdStud, M6 x 1.0 x 30Nut, M6 hex, flangedFtg, 1/8NPT x 3/8Hs 45 deg.O-ringSpacerScrew, Tabulated M4 X 12Plug, 1/8”11114414144411121TP-6730 7/12

1--14: Pulley AssemblyVariation: 3804142776See Group 1--31534238041427Item1234567Part nPulley, fanPulley, crankshaft/fanWasher, crankshaft pulleyBolt, 7/16-20 x 2 1/4 HxHd Gr8Bolt, 3/8-24 x 1 SktHd Grade 5Bolt, M8-1.25 x 20 hxhd gr 8.8WasherQty.1111344# Common hardware; procure locally.TP-6730 7/1219

1--15: AlternatorVariation: 38050308198121017647521143Items not shown: 13, 14, 15, 16, 1838050308Item123456789101112131415161718Part escriptionAlternator, 70 ampPulley, tensionerPulley, idlerWasher, flat 3/8 SAEBracket, alternatorSpacer, mount, 10 mmBlock, mountSpacer, mount, 8 mmBolt, M8-1.25 x 110 HxHd Gr8.8Bolt, M8-1.25 x 50 HxHd Gr 8.8Bolt, 3/8-16 x 4 1/2 HxHd Gr 5Nut, M8-1.25 flange serratedWasherBolt, M10-1.50 x 90 HxHd Gr8.8Washer, lock M10Washer, 3/8Bolt, M10-1.50 x 85 HxHd Gr8.8Nut, M6-1.0Qty.111412211131121311# Common hardware; procure locally.20TP-6730 7/12

NotesTP-6730 7/1221

2--1: Engine Block/Lower EndVariaton: 4.3 L1046370 122TP-6730 7/12

2--1: Engine Block/Lower EndVariaton: 4.3 LItemPart P-6730 7/12DescriptionRing kit, piston std.Ring kit, piston (0.50 mm OS)Piston kit, eng (std)Piston kit, eng (0.127mm OS)Piston kit, eng (0.5mm OS)Rod, connBolt, conn rod (mj9x1 x43)Bearing kit, conn rod (std)Block, eng (incls:bearing,cm/shf/cap, crlshf (only)/bolt,crishf/plug, eng blk core)Plug, eng blk oil gal (rr)Plug, camshaft rear bearing holePin, crnkshft rear oil seal locatorPin, cylinder head locatorPinPlug, eng blk core hole (brass)Valve, oll fltr bypassPin, cm/shf spktCamshaftChain kit, tmg (w/spkts)Sprocket, cm/shft (see chain kit)Spricket, cr/shftBolt, camshaft sprocketBolt, camshaft retainerRetainer, camshaftBearing, camshaft (#1 posn)Bearing, camshaft(#2 posn,Axxxxxxx on housing flange)Bearing, camshaft(#2 posn,housing flange is blank)Bearing, camshaft(#3 posn,housing flange is blank)Bearing, camshaft(#3 posn,Axxxxxxx on housing flange)Bearing, camshaft (#4 posn)Gasket, w/pmp (part of 35)Bolt, water pump 3/8-16 x 2.12Stud, water pumpPump kit, waterShaft, oil pump drivePin, locator 1/4 x 5/8Retainer, oil pump drive shaftPump, oil (.742 dia. tube)Bolt, oil pump 7/16-14 x 2 3/8Screen, oil pumpPlug, oil pressure relief valveboreValve, oil press rlf (part of 39,47)Spring, oil press rlf vlvBolt, oil pump coverPin, oil press rlf vlv spr st(part of 39, 47)Cover, oil pumpFitting, oil filterFilter, oilGear, flywhl ring (part of 108)Weight, flywhl (barrel-shapedpin, .625” long)Weight, flywhl (pin groove)(barrel-shaped pin (groove-f)Bolt, flywhl (7/16-20 x 31/32)Pin, flywhl locQty.Item Part 5263132111111124RH11211111AR61DescriptionSeal, cr/shf rr oil (part of 71)Crankshaft, (incl 53)Pin, eng frt cvr locGasket, eng frt cvrBalancer, crishfBolt, eng frtCover, eng frtKey, crankshaft balancerBearing kit, crishf (#1, 2, 3) (std)Bearing kit, crankshaft (.001mm OS)Bolt, crishf brg capNot sold separatelyGasket, crkshft rear oil seal hsgStud, crkshft rear oil seal retainStud, cr/shf rr oil seal ret(1/4-20x34)Bolt, crankshaft rear oil sealhousingBolt, crankshaft rear oil sealhousingHousing, crishf rr oil seal (incl54, 68)Not sold separatelyBolt, oil pan bfl (m6x1x16, 12.7odGasket, oil panPan, oil (incl 77, 78)Seal, oil pan drn plug (o ring)not usedBolt, oil pannot usedPlug, 476 x .31Seal, cr/shf frt oilNut, crishf rr oil seal retWasher, o/pmp cvr (part of #39)Bolt, balancer shaft gearGear kit, balr shf (lncls drive&driven gr)Retainer, balancer shaftBalancer, internalPlug, camshaft rear bearing holeBearing kit, balr shf (incls rr brg,instr sh & spacer)Bolt, balancer shaft retainerSee item 89not usedGasket, water pump coverBolt, w/pmp cvr (1/4-20x 0.62,0.5 thd)Bolt, water pump coverFlywheel, eng (incls ring gear)Plug, eng blk cool drn hole(1/4-18 nptf thd)Grommet, engine front coverBearing, clu pilotBearing, balancer shaft frontSee item 91Bolt, gr/shf posn senSensor, cr/shf posnShoe, tmg chain tensrBolt, balancer shaft retainerBracket, tmg belt 11111123

2--2: Engine Head/Upper EndVariaton: 4.3 L6370 224TP-6730 7/12

2--2: Engine Head/Upper EndVariaton: 4.3 LItemPart M16401GM16524GM16400GM16465TP-6730 7/12DescriptionCover, valve rocker armCover, vlv rkr armCap, oil filSee Group 1-10See Group 1-10See Group 1-10See Group 1-10Grommet, valve rocker armcoverPlug, 3/8-18 x .42PlugBolt, intake manifoldManifold, intGasket kit, int manif(incls 2 intake manifold gaskets)Bolt, valve rocker arm coverGasket, valve rocker arm coverBolt, cy. hd, lg (7/16-14x3 51/64)Bolt, cy. hd, md (7/16-14x3 1/16)Bolt, cy. hd, short (7/16 x 1 3/4)See Group 1-12Valve, exhaust (std)Valve, intake standardLifter, valveRod, valve pushGasket, cylinder headQty.RHLH11ARAR811621041066612122Item Part GM16485GM75084GM75231DescriptionHead, cylinderSeal, intake valve stem oilSpring, valve (w/o damper)Seal, intake valve stem oilSeal, exh vlv stem oilKey, valve stemCap, valve springnot usednot usednot usedSee Group 1-10See Group 1-11Grommet, PCV valvenot usedGuide, valve lifter push rodBolt, balancer shaft retainerBolt, valve lifter guideNipple, htr inl hoseClamp, w/pmp inl hoseHose, w/pmp inl (incl clamps)Support, valve rocker armArm, vlv rkr (incl 107)Bolt, vlv rkr arm piv (part of 106)Gasket kit, cyl hd(2 head gaskets, 2 intake manifgaskets, 12 valve stem sealsQty.26126624121212121212125

Notes26TP-6730 7/12

NotesTP-6730 7/1227

KOHLER CO. Kohler, Wisconsin 53044Phone 920-457-4441, Fax 920-459-1646For the nearest sales and service outlet in theUS and Canada, phone 1-800-544-2444KohlerPower.comTP-6730 7/12cE 2010, 2012, 2017 by Kohler Co. All rights reserved.Kohler Power SystemsAsia Pacific Headquarters7 Jurong Pier RoadSingapore 619159Phone (65) 6264-6422, Fax (65) 6264-6455

Engine Engine Model: General Motors 4.3 L Powertrain EPA Certified Engines Generator Models: 25/30REZGB 38RCL 40/45REZG 40/45ERES TP-6730 7/12c Service Parts

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