Jeep Cherokee 1999 Electronic Service Manual page 1079

9 - 62 4.0L ENGINE
SERV I CE PROCEDU RES (Cont inue d)
Fig. 12 Ring Gap Orientation
Fig. 13 Connecting Rod Bearing Inspection
CONNECTING RODS
Misa lign ed or ben t con n ect in g r ods ca n ca u se
a bn or m a l wea r on pist on s, pist on r in gs, cylin der
wa lls, con n ect in g r od bea r in gs a n d cr a n ksh a ft con -
n ect in g r od jou r n a ls. If wea r pa t t er n s or da m a ge t o
a n y of t h ese com pon en t s in dica t e t h e pr oba bilit y of a
m isa lign ed con n ect in g r od, in spect it for cor r ect r od
a lign m en t . Repla ce m isa lign ed, ben t or t wist ed con -
n ect in g r ods.
Fig. 14 Locking Tab Inspection
Fig. 15 Scoring Caused by Insufficient Lubrication
or by Damaged Crankshaft Pin Journal
BEARING-TO-JOURNAL CLEARANCE
(1) Wipe t h e oil fr om t h e con n ect in g r od jou r n a l.
(2) Use sh or t r u bber h ose sect ion s over r od bolt s
du r in g in st a lla t ion .
(3) Lu br ica t e t h e u pper bea r in g in ser t a n d in st a ll
in con n ect in g r od.
(4) Use pist on r in g com pr essor t o in st a ll t h e r od
a n d pist on a ssem blies. Th e oil squ ir t h oles in t h e
r ods m u st fa ce t h e ca m sh a ft . Th e a r r ow on t h e pist on
cr own sh ou ld poin t t o t h e fr on t of t h e en gin e (F ig.
16). Ver ify t h a t t h e oil squ ir t h oles in t h e r ods fa ce
t h e ca m sh a ft a n d t h a t t h e a r r ows on t h e pist on s fa ce
t h e fr on t of t h e en gin e.
(5) In st a ll t h e lower bea r in g in ser t in t h e bea r in g
ca p. Th e lower in ser t m u st be dr y. P la ce st r ip of P la s-
t iga ge a cr oss fu ll widt h of t h e lower in ser t a t t h e cen -
t er of bea r in g ca p. P la st iga ge m u st n ot cr u m ble in
u se. If br it t le, obt a in fr esh st ock.
(6) In st a ll bea r in g ca p a n d con n ect in g r od on t h e
jou r n a l a n d t igh t en n u t s t o 45 N·m (33 ft . lbs.)
t or qu e. DO NOT r ot a t e cr a n ksh a ft . P la st iga ge will
sm ea r, r esu lt in g in in a ccu r a t e in dica t ion .
(7) Rem ove t h e bea r in g ca p a n d det er m in e a m ou n t
of bea r in g-t o- jou r n a l clea r a n ce by m ea su r in g t h e
widt h of com pr essed P la st iga ge (F ig. 17). Refer t o
E n gin e Specifica t ion s for t h e pr oper clea r a n ce. P la s -
tig a g e s h o u ld in d ic a te
a c ro s s th e e n tire w id th o f th e in s e rt. If th e
X J
th e s a m e c le a ra n c e