Jeep Cherokee 1999 Electronic Service Manual page 1098

X J
REM OVAL AN D I N STALLAT I ON (Cont inue d)
Fig. 44 Timing Case Cover Components
(16) In st a ll t h e pu sh r ods.
(17) In st a ll t h e r ocker a r m s a n d pivot a n d br idge
a ssem blies. Tigh t en ea ch of t h e ca pscr ews for ea ch
br idge a lt er n a t ely, on e t u r n a t a t im e, t o a void da m -
a gin g t h e br idge (Refer t o Rocker Ar m s a n d P u sh
Rods in t h is sect ion ).
(18) In st a ll t h e en gin e cylin der h ea d cover.
(19) P osit ion t h e oil pu m p gea r. Refer t o Dist r ibu -
t or in t h e Com pon en t Rem ova l/In st a lla t ion sect ion of
Gr ou p 8D, Ign it ion Syst em s.
(20) In st a ll t h e dist r ibu t or a n d ign it ion wir es.
Refer t o Dist r ibu t or in t h e Com pon en t Rem ova l/In -
st a lla t ion sect ion of Gr ou p 8D, Ign it ion Syst em s.
(21) In st a ll t h e ser pen t in e dr ive 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 for t h e pr oper pr ocedu r e).
NOTE: During installation, lubricate the hydraulic
valve tappets and all valve components with Mopar
Engine Oil Supplement, or equivalent. The Mopar
Engine Oil Supplement, or equivalent must remain
with the engine oil for at least 1609 km (1,000
miles). The oil supplement need not be drained until
the next scheduled oil change.
(22) In st a ll t h e A/C con den ser a n d r eceiver /dr ier
a ssem bly, if equ ipped (r efer t o Gr ou p 24, H ea t in g a n d
Air Con dit ion in g).
CAUTION: Both service valves must be opened
before the air conditioning system is operated.
(23) In st a ll t h e r a dia t or, con n ect t h e h oses a n d fill
t h e coolin g syst em t o t h e specified level (r efer t o
Gr ou p 7, Coolin g Syst em for t h e pr oper pr ocedu r e).
(24) Ch eck t h e ign it ion t im in g a n d a dju st a s n ec-
essa r y.
(25) In st a ll t h e gr ille a n d bu m per, if r em oved.
(26) Con n ect n ega t ive ca ble t o ba t t er y.
1999 XJ Cherokee
Publication No. 81-370-9146
TSB 26-11-98 November, 1998
CAMSHAFT BEARINGS
REMOVAL
Th e ca m sh a ft r ot a t es wit h in fou r st eel-sh elled,
ba bbit t -lin ed bea r in gs t h a t a r e pr essed in t o t h e cyl-
in der block a n d t h en lin e r ea m ed. Th e ca m sh a ft
bea r in g bor es a n d bea r in g dia m et er s a r e n ot t h e
sa m e size. Th ey a r e st epped down in 0.254 m m
(0.010 in ch ) in cr em en t s fr om t h e fr on t bea r in g (la r g-
est ) t o t h e r ea r bea r in g (sm a llest ). Th is per m it s ea s-
ier r em ova l a n d in st a lla t ion of t h e ca m sh a ft . Th e
ca m sh a ft bea r in gs a r e pr essu r e lu br ica t ed. Ca m sh a ft
en d pla y is m a in t a in ed by t h e t h r u st pla t e.
(1) Rem ove t h e ca m sh a ft . Refer t o Ca m sh a ft in
t h is sect ion for pr ocedu r e.
NOTE: It is not advisable to attempt to replace
camshaft bearings unless special removal and
installation tools are available.
(2) Usin g Specia l t ool, r em ove t h e ca m sh a ft bea r-
in gs.
INSTALLA TION
(1) In spect t h e ca m sh a ft
u n even wea r pa t t er n or fin ish .
(2) In spect t h e ca m sh a ft lobes a n d dist r ibu t or gea r
for wea r.
(3) In spect t h e ca m sh a ft t h r u st pla t e for wea r. If
t h e pla t e sh ows excessive wea r in spect t h e ca m sh a ft
oil pr essu r e r elief h oles in t h e r ea r ca m jou n r a l. Th e
r elief h oles m u st be clea n a n d fr ee of debr is.
CAUTION: Make sure outside diameter of number 1
bearing is clean. Make sure that the bearing is
properly installed in the engine block, align the oil
hole in the bearing with the oil gallery in the bear-
ing bore. Failure to do so will cause inadequate oil
supply for the sprockets and timing chain.
(4) Usin g specia l t ool, in st a ll n ew ca m sh a ft bea r-
in gs.
(5) Lu br ica t e t h e ca m sh a ft wit h Mopa r
su pplem en t , or equ iva len t .
(6) Ca r efu lly in st a ll t h e ca m sh a ft t o pr even t da m -
a ge t o t h e ca m sh a ft bea r in gs.
(7) P osit ion t h e t h r u st pla t e a n d in st a ll t h e t wo
r et a in in g scr ews. Tigh t en scr ews t o 24 N·m (18 ft .
lbs.).
(8) In st a ll t h e ca m sh a ft
spr ocket a n d t im in g ch a in wit h t h e t im in g m a r ks
a lign ed. In st a ll t h e spr ocket bolt .
(9) Tigh t en t h e ca m sh a ft spr ocket bolt a n d wa sh er
t o 68 N·m (50 ft . lbs.).
(10) To ver ify cor r ect in st a lla t ion of t h e t im in g
ch a in , t u r n t h e cr a n ksh a ft t wo fu ll r evolu t ion s t h en
posit ion t h e ca m sh a ft spr ocket t im in g m a r k a s sh own
4.0L ENGINE 9 - 81
bea r in g jou r n a ls for
en gin e oil
spr ocket , cr a n ksh a ft