Group 05 CYLINDER HEAD, VALVES, AND …

1 EngineRepair- - ------------CylinderHead,ValvesandCamsha ft20-05-1 Group05 CYLINDERHEAD, VALVES, ANDCAMSHAFTPRELIMINA RYVALVECHECKSD uringdisassembly, ,Worn,orDistortedValveGuidesLackoflubric ationCylinderheaddistortionExcessiveheat UnevenlytightenedcylinderheadcapscrewsDi stortedCylinderHeadandCylinderHeadGasket LeakageImproperlytightenedcylinderheadca pscrewsFaultygasketinstallationIncorrect gasketmaterialExcessiveoilpressureImprop ercylinderlinerheightabovecylinderblockW ornorBrokenValveSeatsMisalignedvalvesDis tortedcylinderheadCarbondepositsonseatsd uetoincompletecom-bustionValvespringtens iontooweakExcessiveheatImpropervalveclea ranceImpropervalvetimingBurned,Pitted,Wo rn,orBrokenValvesWornordistortedvalvesea tsWornvalveguidesInsufficientcoolingInsu fficientlubricationCockedorbrokenvalvesp ringsPreignitionImproperengineoperationI mpropervalvetraintimingFaultyvalverotato rsWarpedordistortedvalvestems"Stretched" valvesduetoexcessivespringtensionWarpedc ylinderheadBentpushrodsCarbonbuild-uponv alveseatsRockerarmfailureTM-1106(Jan-79) "TOC" pistonat ( ).

2 Engines-400 Series20-05-2 CylinderHead, VALVES, andCamshaftEngineRep airSixCylinderEngineCheckingValveClearan ce-ContinuedFourCylinderEngine4E I3I E2E I1I ET2284? ( ) and3 and2 and4 and4 (Jan-79) , "TOC" (A, ) cylinderarein theupposition(rockerarmsloose).OFENGINE- 4321E I lEEI ( ) ( ) , valves , ,3,and5 ,2,and4 intakevalves( ). "TOG"ofitscompressionstroke, ,4,and6 ,5,and6 (Jan-79) weartocamlobes,camfollowers, (6-Cylindershown) ( ). (coun-terclockwise). , .. ( ) ( ) .. ( ) .. ( )6404 TandA; .. ( ) .. ( )Engines-400 Series- ----- ..-20-05-4 CylinderHead, valves , (notshown). (6466 AEngineShown) , ("A"engines) ("T"and"A"engines) (6466 AEngineShown) (Jan-79) :6466T(072864-)andA(068223-) enginesusea one-piecerockerarmshaftclampin placeof :Whenremovingrockerarmshaftcompo-nents, (6-CylinderShown) ( ). ,scores, :Wearcouldindicateweakvalvesprings,bentp ushrods, (B, ).

3 (C, ). (A, ).Engines-400 SeriesEngineRepairCylinderHead, VALVES, an dCamshaft20-05-5R , :If therockerarmhasbeendamagedbyavalvefailur e,replaceit ~__I- ,insuringthatspringpin(A, )andlocatinghole(B) (75Nm)( ).TM-1106(Jan-79) ,VALVESPRINGS,VALVEROTATORS, :Whenremovingvalves,valvesprings,andvalv erotators, valvespringcompressorto ,wear, .. ( )( ) .. ( )( ) valves , defective, removedfromthevalvehead, , VALVES, andCamshaftEngineRepairInspectio nandRepair-ContinuedRG1l77A-44-1/2 (42700,64040) (6404T,Aand6466)~. ( ) (B, ) ,./"A/'\'?1; ( )todetermineif valvesareoutofround, (Jan-79) ( ). ( ) .. ( ) ( ) ( ) ( ), , valves , ( ). >' ( ) ,pits, (Jan-79) (4270D,6404D).450(6404T,A and6466).. ( )D-ValveSeatRunout(Maximum).. ( ) , , valves , , dialindicatortocheckvalveheight( ).ValveHeightSpecification(Inrelationtoc ylinderheadsurface)42700,64040.

4 ( )ExhaustValve.. ( )6404 TandA, ( )NOTE:Ifvalvefaceprotrudes, valveisrecessed,installeithernewvalves,v alveseats,orboth, (Jan-79) ( ). :ValveSeatRing42700,64040andT, .. JOE-67 Exhaust.. JOE-666404A, .. (A, )andRing(8)to-20 F(-29 C) (C) , VALVES, andCamshaft20-05-9 InstallingOversizeInsertsInsomecases, thiscase,oversizeinsertsareavailablein ( ) ( ). \ straightedgetochecktheheadforlevel( ). ( )forevery5 in.(127m m) (Jan-79) ( )Engines-400 Series20-05-10 CylinderHead, valves , " " ,insuringthatspringpin(A, )andlocatinghole(8) (Jan-79) (75Nm)( ). (6 cylinderengines). ,T .. ,T andA(plainhead).. ,T,andA(" "head).. ,TandA(plainhead).. ,TandA(" "head).. , valves , dialindicatoroncamshaft( ).. ( ) ( ) ( ). (Jan-79) , :Anindexingmarkhasbeenplacedacrossthepar tinglineofthetwopartsof thegear(A, ).If themarkhasseparated, :If eithergearhasfailed,bothgearsmustberepla cedasa , valves , press( ).

5 , ( ) ( ) ( ) .. ( ) .. ( ) , (Jan-79) :If camshaftis replacedduetoadamagedoilpumpdrivegear,ch eckgearandshaftonoilpumpfordamageandrepl aceif camshaftisre-placed, a hydrau-licpress.( ). (A)andspacer(B). (C). (C)andkeyway(D) , VALVES, andCamshaft20-05-13 InstallationIf (ND425)MagneticHoldingToolSettoholdcamfo llowersawayfromcamshaftboreuntilcamshaft is , (Jan-79) pistononTDCofitscompressionstroke,alignt imingmarks(C, ) (27Nm)( ). (115Nm)( ). ( )