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ItemPart NumberDescription
1-Dual mas s flywheel2-Clut ch fricti on plate face
3-Clut ch cover locat ing dowel (3 off)
4-Engi ne ti mi ng special t ool l ocati on5-Bolt (8 off)
The dual mas s flywheel is i nst all ed on vehi cl es wit h manual transmis si on. On automatic t rans mis s ion vehicles , a t orqueconvert er fl ex-plat e is ins tall ed.
The dual mas s flywheel compris es a primary mas s and a s econdary mass that t rans mit s dri ve, vi a the cl utch dri ven plate,t o the gearbox. The s econdary mas s i s s upported on a rol ler bearing wit hi n t he pri mary mass . The pri mary mas s is s ecuredt o the fl anged rear end of t he crankshaft wit h 8 bolt s . The drive bet ween the primary and s econdary mass es i s transmit tedt hrough a t ors ional spring damper. The flywheel provi des a cons t ant drive s peed to the gearbox, wit hout trans mi tt ingt ors ional and t rans ient vibrat ions produced by t he engi ne.
The outer face of t he fl ywheel i s machi ned to provide a smoot h s urface for the cl utch fri ct ion pl at e t o engage on. Threedowels are equal ly s paced around the out er edge of t he s econdary mas s , and provide the l ocati on for t he clut ch coveras sembl y. The flywheel is dynamically bal anced t o eli mi nat e vibrat ions from t he rot at ing as s embly.
A ring gear formed on t he outer circumference of the primary mas s al lows t he engagement of the s t art er motor.
Two holes are formed on t he engine s ide of t he dual mass fl ywheel. The l arger diameter hole is provi ded to accept theins ert ion of an engine ti ming s peci al tool.
CAMSHAFT TIMING COMPONENTS
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ItemPart NumberDescription
1-Exhaus t camshaft pul ley2-Cams haft ti mi ng chain
3-Exhaus t camshaft drive gear
4-Exhaus t camshaft5-Int ake camshaft
6-Int ake camshaft drive gear
7-Timi ng chai n hydraulic tens ioner8-Idl er pul ley
9-Cool ant pump dri ve gear
10-Crankshaft drive gear11-Bolt
12-Plain W as her
13-Cams haft dri ve bel t14-Automat ic t ensi oner
Camshaft Drive
The crankshaft gear dri ves the exhaus t cams haft via a toot hed ti ming bel t routed around the coolant pump, aut omat ict ens ioner and idl er pull eys . The cranks haft and ti ming components rotat e clockwi s e when viewed from the front of t heengi ne. Correct belt t ens ion is mai ntained by the s pri ng loaded automat ic t ensi oner, located on t he RH front face of thecyl inder block.
The t ens ioner als o provi des t he means t o remove the belt . The idl er pul ley i s located behind t he front engi ne mounti ng,and is secured t o t he cyl inder block wit h t he engi ne mounti ng lower bolt t hat pas s es through the center of t he pul ley.
Timi ng Chain Hydraul ic Tensi oner
Page 779 of 3229

ItemPart NumberDescription
A-Hydraul ic t ensi oner - retai ned pos it ionB-Hydraul ic t ensi oner - releas ed pos i ti on
1-Exhaus t cams haft
2-Int ake cams haft3-Camshaft ti ming chain
4-Upper chain guide
5-Tens ioner head6-Tens ioner s ervice pin
7-Hydraul ic t ensi oner
8-Bol t (3 off)The int ake cams haft i s dri ven by the exhaust cams haft via a s hort 40-l ink t iming chai n. The chain is routed around a dri vegear formed on each of t he cams hafts . Chain t ensi on is cont roll ed by a hydrauli c t ens ioner mounted bet ween thecamshafts , and s ecured wit h 3 s crews to t he cylinder head. The t ensi oner body is dril led wi th an oil pas sage t hat coi ncideswit h an oi l port in the cyli nder head.
The hydraulic tens ioner as s embly i s posi ti oned bet ween t he upper and l ower s ides of t he chai n, wit h t he tens ioner headact ing on the lower si de of the chain. The t ens i oner head and upper end of t he tens ioner are manufact ured from moldedplas ti c, and are formed wi th chai n guides.
The t ens ioner body hous es an i nt egral plas ti c s ervice pin that locates i n t he hydraulic tens ioner head. The s ervice pinremai ns int egral wit h t he tens ioner and is us ed duri ng maint enance t o wi thdraw and lock the hydraul ic t ens i oner i n theret ained pos it ion.
Cams haft Timi ng Chain
Page 780 of 3229
ItemPart NumberDescription
1-Timing chain colored li nk2-Cams haft t imi ng chai n
3-Intake cams haft ti ming mark
4-Intake cams haft dri ve gear5-Exhaus t cams haft dri ve gear
6-Exhaus t cams haft ti ming mark
The chai n is provided wi th 2 col ored t imi ng li nks that coinci de wi th a ti ming mark on the front face of each camshaft drivegear. The t imi ng marks are provided for correct s et t ing of t he cams haft and valve timing. For furt her det ails on s et t ing t hevalve t imi ng, refer t o t he relevant Service Repair Procedures (SRP) manual.
The t imi ng chai n and camshaft gears are spl as h l ubricat ed wit h oil from the hydraul ic t ens i oner.
Camshaft Drive Component Covers
Page 781 of 3229
ItemPart NumberDescription
1-Rear ti ming belt cover2-Upper t iming belt cover
3-Lower t iming belt cover
4-Screw (9 off)A 1-piece rear and 2-pi ece front t iming belt cover enclos es the cams haft drive component s. The pl as t ic t iming covers ares ecured to the cyli nder block and cylinder head wit h 9 s crews . A hol e is formed in the upper front t iming belt cover, and isprovided t o all ow t he ins ert ion of a special t ool us ed to lock t he exhaus t cams haft pull ey.
CYLINDER HEAD COMPONENTS
Page 782 of 3229
ItemPart NumberDescription
1-High Press ure (HP) fuel i njector (4 off)2-Struct ural camshaft cover
3-Exhaus t cams haft
4-Hydraulic las h adjus ter and rol ler finger rocker (16 off)5-Spl it t aper coll ets (32 off)
6-Upper s pri ng guide (16 off)
7-Valve s pri ng (16 off)8-Lower s pri ng guide (16 off)
9-Cyl inder head
10-Gasket11-Exhaus t val ve (8 off)
Page 783 of 3229
12-Int ake val ve (8 off)
13-Glow pl ug (4 off)
14-Cyl inder head bol t (10 off)15-Int ake cams haft
16-Cyl inder head front oi l seal
Cylinder Head and Structural Camshaft Cover
ItemPart NumberDescriptionA-St ructural cams haft cover
B-Cyli nder head
1-Injector mount ing clamp bol t (4 off)2-Injector mount ing clamp (4 off)
3-Dowel (4 off)
4-Gas ket5-Exhaus t cams haft
6-Cams haft beari ng hous i ng (5 per cams haft )
7-Intake cams haft8-Intake port rais ed profil e (at each i nt ake port )
9-Intake valve
10-Exhaus t valve11-Cooli ng channel
12-Cooli ng channel
13-Oi l s upply port14-Injector bore
15-PCV ports
Page 784 of 3229

The cyl inder head and st ructural cams haft cover are manufactured to form mat ing parts . The part s are mil led i n a si ngl eoperati on and accurat ely pos it ioned wi th 2 alignment s leeves. The 2 components mus t al ways be ins tall ed t oget her, andnot renewed as s eparate component s . The cyl inder head and cams haft cover are s eal ed to each ot her during manufact urewit h a gas ket and s ili cone bas ed s eal ant, and are s ecured wit h 27 bolt s . An oil s eal i nst all ed at the front of t he cyl inderhead provides s eal ing of t he exhaus t camshaft hous ing. The open port s at the rear of the cyli nder head are sealed wit ht he vacuum pump and hi gh-pres s ure fuel pump s eal ing rings .
Two ali gnment sl eeves correct ly l ocat e t he cyl inder head and gas ket to t he cylinder block. The cyli nder head is secured t ot he cyl inder bl ock wit h 10 deep-s eat ed bolt s .
• NOTE: The cyl inder head bol ts are not acces si ble wit h the st ruct ural cams haft cover i nst all ed.
• NOTE: The cyl inder head is not t o be reworked.
The cyl inder head is manufact ured from al uminum alloy, havi ng valve s eats and guides made of s i nt ered st eel. Thecyl inder head is precis ely machi ned and mil led t o i ncorporate t he 4 combus ti on chambers, cams haft l ower beari nghous i ngs , oil drill ings and cool ant gal leri es, and t he air i ntake, val ve ti ming and fuel sys t em component bores andhous i ngs .
The desi gn of the cyli nder head maximizes air flow and s wi rl i n the combus ti on chambers. The 2 int ake val ve seat s aremachined wit h rais ed profil es that act to promote swi rl of t he int ake ai r fl ow. Combined wit h t he acti on of the i ntakemanifold heli cal port , t he s wirl effect of the 2 int ake port profi les al lows t he air and i nject ed fuel t o complet el y mi x, andreach t he outer edge of the combus ti on chamber.
The s truct ural camshaft cover is manufact ured from alumi num all oy, and i s machined on t he upper s urface wit h t hecamshaft upper bearing hous ings . The cover is al so formed wi th 4 int ake ai r fi ll ing t racts , fuel i nject or bores and ori fi cesfor t he cyl inder head cover PCV components . The i nt ake air t racts join the i ntake air mani fold to the cyli nder head int akefi ll ing port s .
The cyl inder head al s o provides t he mounti ng locati ons for the foll owing:
Front engi ne mounti ngFront and rear engine l ifti ng eyesInt ake and exhaus t manifol dsEGR valve and coolerFuel fil ter s upport bracketThermal cont rol moduleVacuum pump and high-press ure fuel pump.
Cylinder Head G asket
ItemPart NumberDescription
1-Engi ne type i dent ificati on
2-Gas ket thi cknes s identi fi cat ion3-Gas ket thi cknes s identi fi cat ion
The cyl inder head gas ket is made from l aminated metal and is avail abl e i n 4 di fferent thickness es . Lugs formed on thes ide of t he gasket are 'dot' marked to i dent ify t he engi ne t ype, and t he thi ckness of t he gas ket i nst all ed. A new gasket iss elect ed bas ed on t he pis ton protrusi on meas urement from t he cyl inder block.
For furt her det ail s on cyl inder head gas ket sel ect ion, refer t o t he rel evant Servi ce Repair Procedures (SRP) manual .
Camshafts