Jeep Cherokee 1999 Electronic Service Manual page 1064

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REM OVAL AN D I N STALLAT I ON (Cont inue d)
(11) 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. 64).
Fig. 64 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 con-
necting 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. 65).
(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. 65).
(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.
Fig. 65 Rod and Piston Assembly Installation
(8) Th e r od jou r n a l is iden t ified du r in g t h e en gin e
pr odu ct ion by a color-coded pa in t m a r k on t h e a dja -
cen t ch eek or cou n t er weigh t t owa r d t h e fla n ge (r ea r )
en d of t h e cr a n ksh a ft . Th e color codes u sed t o in di-
ca t e jou r n a l sizes a r e 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 .
(9) Wh en r equ ir ed, u pper
in ser t s of differ en t sizes m a y be u sed a s a pa ir (r efer
t o Con n ect in g Rod Bea r in g F it t in g Ch a r t ). A st a n -
da r d size in ser t is som et im es u sed in com bin a t ion
wit h a 0.025 m m (0.001 in ch ) u n der size in ser t t o
r edu ce clea r a n ce 0.013 m m (0.0005 in ch ).
CAUTION: DO NOT intermix bearing caps. Each
connecting rod and bearing cap are stamped with
the cylinder number. The stamp is located on a
machined surface adjacent to the oil squirt hole
that faces the camshaft side of the cylinder block.
(10) In st a ll t h e con n ect in g r od bea r in g ca ps a n d
in ser t s in t h e sa m e posit ion s a s r em oved.
CAUTION: Verify that the oil squirt holes in the
rods face the camshaft and that the arrows on the
pistons face the front of the engine.
(11) In st a ll t h e oil pa n a n d ga sket s a s ou t lin ed in
t h e in st a lla t ion pr ocedu r e.
(12) Lower t h e veh icle.
(13) In st a ll t h e en gin e cylin der h ea d, pu sh r ods,
r ocker a r m s, br idges, pivot s a n d en gin e cylin der h ea d
cover.
(14) F ill t h e cr a n kca se wit h en gin e oil.
REAR MAIN OIL SEALS
REMOVAL
(1) Rem ove t h e flywh eel or con ver t er dr ive pla t e.
Disca r d t h e old bolt s.
(2) P r y ou t t h e sea l fr om a r ou n d t h e cr a n ksh a ft
fla n ge, m a kin g su r e n ot t o scr a t ch or n ick t h e cr a n k-
sh a ft (F ig. 66).
2.5L ENGINE 9 - 47
a n d lower bea r in g