Jeep Cherokee 1999 Electronic Service Manual page 1097

9 - 80 4.0L ENGINE
REM OVAL AN D I N STALLAT I ON (Cont inue d)
t im in g. If t h e t im in g ch a in deflect s m or e t h a n 12.7
m m (1/2 in ch ) r epla ce it .
INSTALLA TION
Assem ble t h e t im in g ch a in , cr a n ksh a ft spr ocket
a n d ca m sh a ft spr ocket
a lign ed (F ig. 41).
(1) 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 t h e keywa y on t h e cr a n ksh a ft , in st a ll
t h e a ssem bly on t h e cr a n ksh a ft a n d ca m sh a ft .
(2) In st a ll t h e ca m sh a ft spr ocket bolt a n d wa sh er
(F ig. 42). Tigh t en t h e bolt t o 68 N·m (50 ft . lbs.)
t or qu e.
(3) To ver ify cor r ect in st a lla t ion of t h e t im in g
ch a in , r ot a t e t h e cr a n ksh a ft 2 r evolu t ion s. Th e ca m -
sh a ft a n d cr a n ksh a ft spr ocket t im in g m a r k sh ou ld
a lign (F ig. 41).
(4) In st a ll t h e cr a n ksh a ft oil slin ger.
(5) Repla ce t h e oil sea l in t h e t im in g ca se cover.
(6) In st a ll t h e t im in g ca se cover a n d ga sket .
(7) Wit h t h e key in st a lled in t h e cr a n ksh a ft key-
wa y, 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.
(8) 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 Sys-
t em for t h e pr oper pr ocedu r e).
(9) In st a ll t h e fa n a n d h u b a ssem bly. In st a ll t h e
sh r ou d.
(10) Con n ect n ega t ive ca ble t o ba t t er y.
CAMSHAFT
REMOVAL
WARNING: THE COOLANT IN A RECENTLY OPER-
ATED ENGINE IS
RELEASE THE PRESSURE BEFORE REMOVING
THE DRAIN COCK, CAP AND DRAIN PLUGS.
(1) Discon n ect n ega t ive ca ble fr om ba t t er y.
(2) Dr a in t h e coolin g syst em . DO NOT wa st e r eu s-
a ble coola n t . If t h e solu t ion is clea n , dr a in it in t o a
clea n con t a in er for r eu se.
(3) Rem ove t h e r a dia t or or r a dia t or a n d con den ser,
if equ ipped wit h A/C (r efer t o Gr ou p 7, Coolin g Sys-
t em for t h e pr oper pr ocedu r e).
(4) Rem ove t h e dist r ibu t or ca p a n d m a r k t h e posi-
t ion of t h e r ot or.
(5) Rem ove t h e dist r ibu t or a n d ign it ion wir es.
(6) Rem ove t h e en gin e cylin der h ea d cover.
(7) Rem ove t h e r ocker a r m s, br idges a n d pivot s.
(8) Rem ove t h e pu sh r ods.
(9) Rem ove t h e en gin e cylin der h ea d a n d ga sket .
(10) Rem ove t h e h ydr a u lic va lve t a ppet s fr om t h e
en gin e cylin der block.
wit h t h e t im in g m a r ks
HOT AND PRESSURIZED.
1999 XJ Cherokee
Publication No. 81-370-9146
TSB 26-11-98 November, 1998
(11) Rem ove t h e vibr a t ion da m per.
(12) Rem ove t h e t im in g ca se cover.
(13) Rem ove t h e t im in g ch a in a n d spr ocket s.
(14) Rem ove t h e fr on t bu m per a n d/or gr ille, a s
r equ ir ed.
(15) Rem ove t h e t wo t h r u st pla t e r et a in in g scr ews,
t h r u st pla t e a n d ca m sh a ft (F ig. 43).
Fig. 43 Camshaft
INSTALLA TION
(1) In spect t h e ca m lobes for wea r.
(2) In spect t h e bea r in g jou r n a ls for u n even wea r
pa t t er n or fin ish .
(3) In spect t h e bea r in gs for wea r.
(4) In spect t h e dist r ibu t or dr ive gea r for wea r.
(5) If t h e ca m sh a ft a ppea r s t o h a ve been r u bbin g
a ga in st t h e t h r u st wa sh er, exa m in e t h e oil pr essu r e
r elief h oles in t h e r ea r ca m jou r n a l. Th e oil pr essu r e
r elief h oles m u st be fr ee of debr is.
(6) Lu br ica t e t h e ca m sh a ft wit h Mopa r E n gin e Oil
Su pplem en t , or equ iva len t .
(7) 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 (F ig. 43).
(8) P osit ion t h e t h r u st pla t e a n d in st a ll t h e r et a in -
in g scr ews. Tigh t en scr ews t o 24 N m (18 ft . lbs.).
(9) In st a ll t h e t im in g ch a in , cr a n ksh a ft spr ocket
a n d ca m sh a ft spr ocket
a lign ed.
(10) In st a ll t h e ca m sh a ft spr ocket bolt /cu p wa sh er.
Tigh t en t h e bolt t o 68 N·m (50 ft . lbs.).
(11) In st a ll t h e t im in g ca se cover wit h a r epla ce-
m en t oil sea l (F ig. 44). Refer t o Tim in g Ca se Cover
In st a lla t ion .
(12) In st a ll t h e vibr a t ion da m per (F ig. 44).
(13) In st a ll t h e h ydr a u lic va lve t a ppet s.
(14) In st a ll t h e cylin der h ea d ga sket wit h t h e
n u m ber s fa cin g u p.
(15) In st a ll t h e cylin der h ea d a n d h ea d bolt s
(Refer t o cylin der h ea d R&I in t h is sect ion for t or qu e
va lu es a n d t igh t en in g sequ en ce).
wit h t h e t im in g m a r ks
X J