Jeep Cherokee 1999 Electronic Service Manual page 1140

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REM OVAL AN D I N STALLAT I ON (Cont inue d)
NOTE: If cylinder wall
removed; the same thickness head gasket removed,
may be used.
MEASURING PISTON PROTRUSION
(1) Use specia l t ool VM.1010 wit h dia l in dica t or
specia l t ool VM.1013 (F ig. 36).
Fig. 36 Measuring Piston Protrusion
(2) Br in g t h e pist on of cylin der n o. 1 exa ct ly t o t op
dea d cen t er.
(3) Zer o t h e dia l in dica t or on t h e cylin der block
m a t in g su r fa ce.
(4) Set u p t h e dia l in dica t or on t h e pist on cr own
(a bove t h e cen t er of t h e pist on pin ) 5m m (1/8 in .)
fr om t h e edge of t h e pist on a n d n ot e t h e m ea su r e-
m en t (F ig. 37).
(5) Repea t t h e pr ocedu r e wit h t h e r est of t h e cyl-
in der s.
(6) E st a blish t h e t h ickn ess of t h e st eel ga sket for
a ll fou r cylin der h ea ds on t h e ba sis of t h e gr ea t est
pist on pr ot r u sion (F ig. 35).
Fig. 37 Piston Protrusion Chart
CAUTION: Gaskets are to be installed DRY. DO NOT
use a gasket sealing compound on the gasket.
liners have not been INSTALLA TION
(1) Rem ove t h e sh op t owels fr om t h e cylin der
bor es. Coa t t h e bor es wit h clea n en gin e oil.
(2) In st a ll cylin der h ea d a lign m en t st u ds VM.1009.
(3) Aft er det er m in in g t h e cor r ect h ea d ga sket
t h ickn ess, clea n t h e block a n d h ea d m a t in g su r fa ces,
pla ce t h e en gin e cylin der h ea d ga sket over t h e a lign -
m en t st u ds.
(4) P la ce t h e en gin e cylin der h ea d over t h e a lign -
m en t st u ds.
CAUTION: New cylinder head bolts should be used.
(5) Tigh t en t h e en gin e cylin der h ea d bolt s in
sequ en ce a ccor din g t o t h e followin g pr ocedu r e (F ig.
38):
a . Th e t h r ea ds a n d u n der side h ea ds of t h e bolt s
sh ou ld be lu br ica t ed. Use t h e cylin der h ea d a lign -
m en t st u ds t ool n u m ber VM-1009. P osit ion t h e h ea ds
on t h e block a n d secu r e wit h t h e t en la r ge cen t er
bolt s a n d spa cer s (cla m ps), fin ger t igh t on ly.
b. E n su r e t h a t t h e va r iou s cla m ps a r e in st a lled
cor r ect ly a n d t h e h ea d ga sket r em a in s in it 's pr oper
posit ion , com plet ely cover ed. Th en , lu br ica t e a n d
in st a ll t h e eigh t sm a ll bolt s, a lso fin ger t igh t .
(6) In st a ll t h e in t a ke a n d exh a u st m a n ifolds wit h
a n ew ga sket , pa r t ia lly t igh t en in g t h e n u t s t o a m a x-
im u m of 5 N·m (44 in . lbs.). Th is will a lign t h e h ea ds.
Refer t o Gr ou p 11, E xh a u st Syst em a n d Tu r bo-
ch a r ger for t h e pr oper pr ocedu r e. In st a ll lift eye a n d
br a ke va cu u m t u be a t t h is t im e.
(7) Th en , t igh t en t h e 12m m bolt s wit h specia l t ool
VM.1019 in t h e followin g m a n n er :
(8) 1s t P h a s e : Tigh t en in g H ea d Bolt s (F ig. 38).
Cen t r a l bolt s (A-L): Tigh t en a ll bolt s, st a r t in g wit h
bolt H t h en G-F -E -D-C-B-A-L-I, t o 30 N·m . Tigh t en
a ll bolt s a n a ddit ion a l 70°, st a r t in g wit h bolt A a n d
con t in u in g in a lph a bet ica l or der. F in a lly, t igh t en a ll
bolt s a n a ddit ion a l 70°, st a r t in g a ga in wit h bolt A
a n d con t in u in g in a lph a bet ica l or der.
(9) Tigh t en t h e 14m m bolt s in t h e followin g m a n -
n er :
(10) Side bolt s (M1-M2): Tigh t en M1 bolt s t o 30
N·m , t h en r ot a t e t h em 85° ( 5). Tigh t en M2 bolt s t o
30 N·m , t h en r ot a t e t h em 85° ( 5).
NOTE: If vehicle is equipped with A/C do not install
A/C lines to compressor and charge A/C till Phase 2
is complete.
(11) 2n d P h a s e : Aft er 20 m in u t es of en gin e oper-
a t ion a t oper a t in g t em per a t u r e, a llow en gin e t o cool
down com plet ely. Th en r et or qu e t h e h ea d bolt s a s fol-
lows:
(12) Cen t r a l bolt s A-L: Com plet ely ba ck off bolt s
on e-by-on e a n d t h en r et igh t en t o 30 N·m plu s 130°
( 5°). Th en pr oceed in t h e sa m e wa y, bolt by bolt ,
followin g a lph a bet ica l or der, a s in dica t ed.
ENGINE 9 - 27