Jeep Cherokee 1999 Electronic Service Manual page 1093

9 - 76 4.0L ENGINE
REM OVAL AN D I N STALLAT I ON (Cont inue d)
a n d t h en su spen d t h e bolt in t h is posit ion (t a pe
a r ou n d t h e bolt ).
(16) Rem ove t h e en gin e cylin der h ea d a n d ga sket
(F ig. 35).
(17) If t h is wa s t h e fir st t im e t h e bolt s wer e
r em oved, pu t a pa in t da b on t h e t op of t h e bolt . If t h e
bolt s h a ve a pa in t da b on t h e t op of t h e bolt or it
isn 't kn own if t h ey wer e u sed befor e, disca r d t h e
bolt s.
(18) St u ff clea n lin t fr ee sh op t owels in t o t h e cyl-
in der bor es.
Fig. 35 Engine Cylinder Head Assembly
INSTALLA TION
Th e en gin e cylin der h ea d ga sket is a com posit ion
ga sket . Th e ga sket is t o be in st a lled DRY. D O N OT
u s e a g a s k e t s e a lin g c o m p o u n d o n th e g a s k e t.
If t h e en gin e cylin der h ea d is t o be r epla ced a n d
t h e or igin a l va lves u sed, m ea su r e t h e va lve st em
dia m et er. On ly st a n da r d size va lves ca n be u sed wit h
a ser vice r epla cem en t en gin e cylin der h ea d u n less
t h e r epla cem en t h ea d va lve st em gu ide bor es a r e
r ea m ed t o a ccom m oda t e
Rem ove a ll ca r bon bu ildu p a n d r efa ce t h e va lves.
(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) P osit ion t h e en gin e cylin der h ea d ga sket (wit h
t h e n u m ber s fa cin g u p) on t o t h e cylin der block.
CAUTION: Engine cylinder head bolts should be
reused only once. Replace the head bolts if they
were used before or if they have a paint dab on the
top of the bolt.
(3) Wit h bolt No.14 h eld in pla ce (t a pe a r ou n d
bolt ), in st a ll t h e en gin e cylin der h ea d. Rem ove t h e
t a pe fr om bolt No.14.
(4) Coa t t h e t h r ea ds of st u d bolt No.11 wit h Loc-
t it e 592 sea la n t , or equ iva len t .
over size va lve st em s.
(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.
36).
CAUTION: During the final tightening sequence,
bolt No.11 will be tightened to a lower torque than
the rest of the bolts. DO NOT overtighten bolt
No.11.
(a ) Tigh t en a ll bolt s in sequ en ce (1 t h r ou gh 14)
t o 30 N·m (22 ft . lbs.) t or qu e.
(b) Tigh t en a ll bolt s in sequ en ce (1 t h r ou gh 14)
t o 61 N·m (45 ft . lbs.) t or qu e.
(c) Ch eck a ll bolt s t o ver ify t h ey a r e set t o 61
N·m (45 ft . lbs.) t or qu e.
(d) Tigh t en bolt s (in sequ en ce):
• Bolt s 1 t h r ou gh 10 t o 149 N·m (110 ft . lbs.)
t or qu e.
• Bolt 11 t o 13 N·m (100 ft . lbs.) t or qu e.
• Bolt s 12 t h r ou gh 14 t o 149 N·m (110 ft . lbs.)
t or qu e.
(e) Ch eck a ll bolt s in sequ en ce t o ver ify t h e cor-
r ect t or qu e.
(f) If n ot a lr ea dy don e, clea n a n d m a r k ea ch bolt
wit h a da b of pa in t a ft er t igh t en in g. Sh ou ld you
en cou n t er bolt s wh ich wer e pa in t ed in a n ea r lier
ser vice oper a t ion , r epla ce t h em .
Fig. 36 Engine Cylinder Head Bolt Tightening
Sequence
(6) In st a ll t h e ign it ion coil a n d br a cket a ssem bly.
(7) Con n ect t h e t em per a t u r e sen din g u n it wir e
con n ect or.
(8) In st a ll t h e spa r k plu gs a n d t igh t en t o 37 N·m
(27 ft . lbs.) t or qu e. Con n ect t h e ign it ion wir es.
(9) In st a ll t h e in t a ke a n d en gin e exh a u st m a n i-
folds (r efer t o Gr ou p 11, E xh a u st Syst em a n d In t a ke
Ma n ifold for t h e pr oper pr ocedu r es).
(10) In st a ll t h e fu el lin es a n d t h e va cu u m a dva n ce
h ose.
(11) If equ ipped, a t t a ch t h e power st eer in g pu m p
a n d br a cket .
(12) In st a ll t h e pu sh r ods, r ocker a r m s, pivot s a n d
br idges in t h e or der t h ey wer e r em oved (r efer t o
Rocker Ar m s a n d P u sh Rods in t h is sect ion ).
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