Jeep Cherokee 1999 Electronic Service Manual page 1082

X J
SERV I CE PROCEDU RES (Cont inue d)
Fig. 21 Bearing Insert Pairs
In st a ll t h e gr ooved m a in bea r in gs in t o t h e cylin der
block a n d t h e n on -gr ooved bea r in gs in t o t h e bea r in g
ca ps.
In st a ll t h e cr a n ksh a ft in t o t h e u pper bea r in gs dr y.
P la ce a st r ip of P la st iga ge a cr oss fu ll widt h of t h e
cr a n ksh a ft jou r n a l t o be ch ecked.
In st a ll t h e bea r in g ca p a n d t igh t en t h e bolt s t o 108
N·m (80 ft . lbs.) t or qu e.
NOTE: DO NOT rotate the crankshaft. This will
cause the Plastigage to shift, resulting in an inaccu-
rate reading. Plastigage must not be permitted to
crumble. If brittle, obtain fresh stock.
Rem ove t h e bea r in g ca p. Det er m in e t h e a m ou n t of
clea r a n ce by m ea su r in g t h e widt h of t h e com pr essed
P la st iga ge wit h t h e sca le on t h e P la st iga ge en velope
(F ig. 22). Refer t o E n gin e Specifica t ion s for t h e
pr oper clea r a n ce.
P la st iga ge sh ou ld in dica t e t h e sa m e clea r a n ce
a cr oss t h e en t ir e widt h of t h e in ser t . If clea r a n ce va r-
ies, it m a y in dica t e a t a per ed jou r n a l or for eign
m a t er ia l t r a pped beh in d t h e in ser t .
Fig. 20 Crankshaft Journal Size Paint I.D. Location
Fig. 22 Measuring Bearing Clearance with
Plastigage
If t h e specified clea r a n ce is in dica t ed a n d t h er e a r e
n o a bn or m a l wea r pa t t er n s, r epla cem en t of t h e bea r-
in g in ser t s is n ot n ecessa r y. Rem ove t h e P la st iga ge
fr om t h e cr a n ksh a ft jou r n a l a n d bea r in g in ser t . P r o-
ceed t o Cr a n ksh a ft Ma in Bea r in g—In st a lla t ion .
If t h e clea r a n ce exceeds specifica t ion , in st a ll a pa ir
of 0.025 m m (0.001 in ch ) u n der size bea r in g in ser t s
a n d m ea su r e t h e clea r a n ce a s descr ibed in t h e pr evi-
ou s st eps.
Th e clea r a n ce in dica t e wit h t h e 0.025 m m (0.001
in ch ) u n der size in ser t pa ir in st a lled will det er m in e if
t h is in ser t size or som e ot h er com bin a t ion will pr o-
vide t h e specified clea r a n ce. F OR EXAMP LE: If t h e
clea r a n ce wa s 0.0762 m m (0.003 in ch ) or igin a lly, a
pa ir of 0.0254 m m (0.001 in ch ) u n der size in ser t s
wou ld r edu ce t h e clea r a n ce by 0.0254 m m (0.001
in ch ). Th e clea r a n ce wou ld t h en be 0.0508 m m (0.002
4.0L ENGINE 9 - 65