Jeep Cherokee 1999, Electronic Service Manual

Page: 1051 / 1948

(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.
NOTE: If valves, springs, or seals are to be inspect-
ed/replaced at this time, refer to Valves and Valve
Springs later in this section for proper procedures.
INSTALLATION
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 over size va lve st em s.
Rem ove a ll ca r bon bu ildu p a n d r efa ce t h e va lves.
(1) F a br ica t e t wo en gin e cylin der h ea d a lign m en t
dowels fr om u sed h ea d bolt s (F ig. 35). Use t h e lon g-
est h ea d bolt . Cu t t h e h ea d of t h e bolt off below t h e
h ex h ea d. Th en cu t a slot in t h e t op of t h e dowel t o
a llow ea sier r em ova l wit h a scr ewdr iver.
(2) In st a ll on e dowel in bolt h ole No.10 a n d t h e
ot h er dowel in bolt h ole No.8 (F ig. 36).
(3) 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.
(4) P la ce 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) over t h e dowels.
(5) P la ce t h e en gin e cylin der h ea d over t h e dowels.
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.
(6) Coa t t h e t h r ea ds of bolt No.7, on ly, wit h Loct it e
P ST sea la n t or equ iva len t .
(7) In st a ll a ll h ea d bolt s, except No.8 a n d No.10.
(8) Rem ove t h e dowels.
(9) In st a ll No.8 a n d No.10 h ea d bolt s.
CAUTION: During the final tightening sequence,
bolt No.7 will be tightened to a lower torque than
the rest of the bolts. DO NOT overtighten bolt No.7.
(10) 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.
37):
(a ) Tigh t en a ll bolt s in sequ en ce (1 t h r ou gh 10)
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 10)
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 6 t o 149 N·m (110 ft . lbs.)
t or qu e.
•
Bolt 7 t o 136 N·m (100 ft . lbs.) t or qu e.
•
Bolt s 8 t h r ou gh 10 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. 34 Engine Cylinder Head Assembly
Fig. 35 Fabricate Alignment Dowels
Fig. 36 Alignment Dowel Locations
9 - 34 2.5L ENGINE X J
REM OVAL AN D I N STALLAT I ON (Cont inue d)