Jeep Cherokee 1999 Electronic Service Manual page 1105

9 - 88 4.0L ENGINE
REM OVAL AN D I N STALLAT I ON (Cont inue d)
Fig. 59 Oil Pump Assembly
INSTALLA TION
(1) In st a ll t h e oil pu m p on t h e cylin der block u sin g
a r epla cem en t ga sket . Tigh t en t h e bolt s t o 23 N·m
(17 ft . lbs.) t or qu e.
(2) In st a ll t h e oil pa n .
(3) F ill t h e oil pa n wit h oil t o t h e specified level.
TIMING CASE COVER OIL SEAL
Th is pr ocedu r e is don e wit h t h e t im in g ca se cover
in st a lled.
REMOVAL
(1) Discon n ect n ega t ive ca ble fr om ba t t er y.
(2) Rem ove t h e ser pen t in e dr ive belt .
(3) Rem ove t h e vibr a t ion da m per.
(4) Rem ove t h e r a dia t or sh r ou d.
(5) Ca r efu lly r em ove t h e oil sea l. Ma ke su r e sea l
bor e is clea n .
INSTALLA TION
(1) P osit ion t h e r epla cem en t oil sea l on Tim in g
Ca se Cover Align m en t a n d Sea l In st a lla t ion Tool
6139 wit h sea l open en d fa cin g in wa r d. Apply a ligh t
film of P er fect Sea l, or equ iva len t , on t h e ou t side
dia m et er of t h e sea l. Ligh t ly coa t t h e cr a n ksh a ft wit h
en gin e oil.
(2) P osit ion t h e t ool a n d sea l over t h e en d of t h e
cr a n ksh a ft a n d in ser t a dr a w scr ew t ool in t o Sea l
In st a lla t ion Tool 6139 (F ig. 60). Tigh t en t h e n u t
a ga in st t h e t ool u n t il it con t a ct s t h e cover.
(3) Rem ove t h e t ools. Apply a ligh t film of en gin e
oil on t h e vibr a t ion da m per h u b con t a ct su r fa ce of
t h e sea l.
Fig. 60 Timing Case Cover Oil Seal Installation
(4) Apply Mopa r Silicon e Ru bber Adh esive Sea la n t
t o t h e keywa y in t h e cr a n ksh a ft a n d in ser t t h e key.
Wit h t h e key in ser t ed in t h e keywa y in t h e cr a n k-
sh a ft , in st a ll t h e vibr a t ion da m per, wa sh er a n d bolt .
Lu br ica t e a n d t igh t en t h e bolt t o 108 N·m (80 ft . lbs.)
t or qu e.
(5) In st a ll t h e ser pen t in e belt a n d t igh t en t o t h e
specified t en sion (r efer t o Gr ou p 7, Coolin g Syst em s
for t h e pr oper specifica t ion s a n d pr ocedu r es).
(6) In st a ll t h e r a dia t or sh r ou d.
(7) Con n ect n ega t ive ca ble t o ba t t er y.
DI SASSEM BLY AN D ASSEM BLY
VALVE SERVICE
Clea n a ll ca r bon deposit s fr om t h e com bu st ion
ch a m ber s, va lve por t s, va lve st em s, va lve st em
gu ides a n d h ea d.
Clea n a ll gr im e a n d ga sket m a t er ia l fr om t h e
en gin e cylin der h ea d m a ch in ed ga sket su r fa ce.
In spect for cr a cks in t h e com bu st ion ch a m ber s a n d
va lve por t s.
In spect for cr a cks on t h e exh a u st sea t .
In spect for cr a cks in t h e ga sket su r fa ce a t ea ch
coola n t pa ssa ge.
In spect va lves for bu r n ed, cr a cked or wa r ped
h ea ds.
In spect for scu ffed or ben t va lve st em s.
Repla ce va lves displa yin g a n y da m a ge.
VALVE REFACING
(1) Use a va lve r efa cin g m a ch in e t o r efa ce t h e
in t a ke a n d exh a u st va lves t o t h e specified a n gle.
(2) Aft er r efa cin g, a m a r gin of a t lea st 0.787 m m
(0.031 in ch ) m u st r em a in (F ig. 61). If t h e m a r gin is
less t h a n 0.787 m m (0.031 in ch ), t h e va lve m u st be
r epla ced.
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