Jeep Cherokee 1999 Electronic Service Manual page 1055

9 - 38 2.5L ENGINE
REM OVAL AN D I N STALLAT I ON (Cont inue d)
(9) 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.
(10) Apply Mopa r Silicon e Ru bber Adh esive Sea l-
a 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 ksh 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.
(11) In st a ll t h e A/C com pr essor (if equ ipped) a n d
gen er a t or br a cket a ssem bly.
(12) In st a ll t h e en gin e fa n a n d h u b a ssem bly a n d
sh r ou d.
(13) In st a ll t h e a ccessor y dr ive belt a n d t igh t en t o
obt a in t h e specified t en sion .
(14) Con n ect n ega t ive ca ble t o ba t t er y.
TIMING CHAIN AND SPROCKETS
Th e t im in g ch a in t en sion er r edu ces n oise a n d pr o-
lon gs t im in g ch a in life. In a ddit ion , it com pen sa t es
for sla ck in a wor n or st r et ch ed ch a in a n d m a in t a in s
t h e cor r ect va lve t im in g.
REMOVAL
(1) Discon n ect n ega t ive ca ble fr om ba t t er y.
(2) Rem ove t h e fa n a n d sh r ou d.
(3) Rem ove t h e ser pen t in e dr ive belt .
(4) Rem ove t h e cr a n ksh a ft vibr a t ion da m per.
(5) Rem ove t h e t im in g ca se cover.
(6) Rot a t e cr a n ksh a ft u n t il t h e "0" t im in g m a r k is
closest t o a n d on t h e cen t er lin e wit h ca m sh a ft
spr ocket t im in g m a r k (F ig. 43).
Fig. 43 Crankshaft—Camshaft Alignment
(7) Rem ove t h e oil slin ger fr om t h e cr a n ksh a ft .
(8) Rem ove t h e ca m sh a ft
r em ove t h e spr ocket s a n d ch a in a s a n a ssem bly (F ig.
44).
(9) To r epla ce t h e t im in g ch a in t en sion er, t h e oil
pa n m u st be r em oved.
r et a in in g bolt a n d
Fig. 44 Camshaft and Crankshaft Sprockets and
INSTALLA TION
(1) Tu r n t h e t en sion er lever t o t h e u n locked (down )
posit ion (F ig. 45).
(2) P u ll t h e t en sion er block t owa r d t h e t en sion er
lever t o com pr ess t h e spr in g. H old t h e block a n d t u r n
t h e t en sion er lever t o t h e lock posit ion (F ig. 45).
Fig. 45 Loading Timing Chain Tensioner
(3) 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 cr a n ksh a ft keywa y, in st a ll t h e
cr a n ksh a ft , ca m sh a ft spr ocket s a n d t im in g ch a in .
E n su r e t h e t im in g m a r ks on t h e spr ocket s a r e pr op-
er ly a lign ed (F ig. 43).
(4) In st a ll t h e ca m sh a ft spr ocket r et a in in g bolt
a n d wa sh er. Tigh t en t h e bolt t o 108 N·m (80 ft . lbs.)
t or qu e.
(5) 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 o posit ion t h e ca m sh a ft
spr ocket t im in g m a r k a s sh own in (F ig. 46). Cou n t
t h e n u m ber of ch a in pin s bet ween t h e t im in g m a r ks
of bot h spr ocket s. Th er e m u st be 20 pin s.
Chain
X J