Jeep Cherokee 1999 Electronic Service Manual page 1102

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REM OVAL AN D I N STALLAT I ON (Cont inue d)
(6) Ra ise t h e veh icle.
(7) Dr a in t h e en gin e oil.
(8) Rem ove t h e oil pa n a n d ga sket .
(9) Rem ove m a in bea r in g ca p br a ce (F ig. 53).
Fig. 53 Main Bearings Caps and Brace
(10) Rem ove t h e con n ect in g r od bea r in g ca ps a n d
in ser t s. Ma r k t h e ca ps a n d r ods wit h t h e cylin der
bor e loca t ion . Th e con n ect in g r ods a n d ca ps a r e
st a m ped wit h a t wo let t er com bin a t ion (F ig. 54).
Fig. 54 Stamped Connecting Rods and Caps
(11) Lower t h e veh icle u n t il it is a bou t 2 feet fr om
t h e floor.
CAUTION: Ensure that the connecting rod bolts DO
NOT scratch the crankshaft journals or cylinder
walls. Short pieces of rubber hose, slipped over the
rod bolts will provide protection during removal.
(12) H a ve a n a ssist a n t pu sh t h e pist on a n d con -
n ect in g r od a ssem blies u p a n d t h r ou gh t h e t op of t h e
cylin der bor es (F ig. 55).
Fig. 55 Removal of Connecting Rod and Piston
Assembly
INSTALLA TION
(1) Clea n t h e cylin der bor es t h or ou gh ly. Apply a
ligh t film of clea n en gin e oil t o t h e bor es wit h a clea n
lin t -fr ee clot h .
(2) In st a ll t h e pist on r in gs on t h e pist on s if
r em oved.
(3) Lu br ica t e t h e pist on a n d r in gs wit h clea n
en gin e oil.
CAUTION: Ensure that connecting rod bolts DO
NOT scratch the crankshaft journals or cylinder
walls. Short pieces of rubber hose slipped over the
connecting rod bolts will provide protection during
installation.
(4) Use a pist on r in g com pr essor t o in st a ll t h e con -
n ect in g r od a n d pist on a ssem blies t h r ou gh t h e t op of
t h e cylin der bor es (F ig. 56).
(5) E n su r e t h e a r r ow on t h e pist on t op poin t s t o
t h e fr on t of t h e en gin e (F ig. 56).
(6) Ra ise t h e veh icle.
(7) E a ch bea r in g in ser t is fit t ed t o it s r espect ive
jou r n a l t o obt a in t h e specified clea r a n ce bet ween t h e
bea r in g a n d t h e jou r n a l. In pr odu ct ion , t h e select fit
is obt a in ed by u sin g va r iou s-sized, color-coded bea r-
in g in ser t s a s list ed in t h e Con n ect in g Rod Bea r in g
F it t in g Ch a r t . Th e color code a ppea r s on t h e edge of
t h e bea r in g in ser t . Th e size is n ot st a m ped on in ser t s
u sed for pr odu ct ion of en gin es.
4.0L ENGINE 9 - 85