Jeep Cherokee 1999 Electronic Service Manual page 1148

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REM OVAL AN D I N STALLAT I ON (Cont inue d)
(3) In st a ll t h e oil filt er a da pt er t o oil filt er ba se.
Tor qu e t o 46.6 N·m (34 ft . lbs.).
(4) In st a ll t h e oil filt er. Tor qu e t o 18 N·m (13 ft .
lbs.) a n d a dd oil.
(5) Con n ect t h e n ega t ive ba t t er y ca ble.
PISTONS AND CONNECTING ROD ASSEMBL Y
REMOVAL
(1) Discon n ect t h e ba t t er y ca ble.
(2) Rem ove cylin der h ea ds, r efer t o cylin der h ea d
r em ova l in t h is sect ion .
(3) Ra ise veh icle on h ost .
(4) Rem ove oil pa n , r efer t o oil pa n r em ova l in t h is
sect ion .
(5) Rem ove t op r idge of cylin der bor es wit h a r eli-
a ble r idge r ea m er befor e r em ovin g pist on s fr om cyl-
in der block. B e s u re to k e e p to p s o f p is to n s
c o v e re d d u rin g th is o p e ra tio n . Ma r k pist on wit h
m a t ch in g cylin der n u m ber.
(6) P ist on s a n d con n ect in g r ods m u st be r em oved
fr om t op of cylin der block. Rot a t e cr a n ksh a ft so t h a t
ea ch con n ect in g r od is cen t er ed in cylin der bor e.
(7) Rem ove con n ect in g r od ca p. In st a ll con n ect in g
r od bolt pr ot ect or s on con n ect in g r od bolt s. P u sh ea ch
pist on a n d r od a ssem bly ou t of cylin der bor e.
NOTE: Be careful not to nick crankshaft journals.
(8) Aft er r em ova l, in st a ll bea r in g ca p on t h e m a t -
in g r od.
PISTON PIN—REMOVAL
(1) Secu r e con n ect in g r od in a soft ja wed vice.
(2) Rem ove 2 clips secu r in g pist on pin .
(3) P u sh pist on pin ou t of pist on a n d con n ect in g
r od.
PISTON RING—REMOVAL
(1) ID m a r k on fa ce of u pper a n d in t er m edia t e pis-
t on r in gs m u st poin t t owa r d pist on cr own .
(2) Usin g a su it a ble r in g expa n der, r em ove u pper
a n d in t er m edia t e pist on r in gs (F ig. 55).
(3) Rem ove t h e u pper oil r in g side r a il, lower oil
r in g side r a il a n d t h en oil r in g expa n der fr om pist on .
(4) Ca r efu lly clea n ca r bon fr om pist on cr own s,
skir t s a n d r in g gr ooves en su r in g t h e 4 oil h oles in
t h e oil con t r ol r in g gr oove a r e clea r.
PISTON RING FITTING
(1) Wipe cylin der bor e clea n . In ser t r in g a n d pu sh
down wit h pist on t o en su r e it is squ a r e in bor e. Th e
r in g ga p m ea su r em en t m u st be m a de wit h t h e r in g
posit ion in g a t lea st 12 m m (0.50 in .) fr om bot t om of
cylin der bor e. Ch eck ga p wit h feeler ga u ge. Top com -
pr ession r in g ga p .25 t o .50m m (.0098 t o .0196 in .).
Secon d com pr ession r in g ga p .25 t o .35m m (.0098 t o
Fig. 54 Piston Assembly
Fig. 55 Piston Rings—Removing and Installing
.0137 in .). Oil con t r ol r in g ga p .25 t o .58m m (.0098 t o
.0228 in .).
(2) If r in g ga ps exceed dim en sion given , n ew r in gs
or cylin der lin er s m u st be fit t ed. Keep pist on r in gs in
pist on set s.
(3) Ch eck pist on r in g t o gr oove clea r a n ce (F ig. 57).
Top com pr ession r in g ga p .08 t o .130m m (.0031 t o
.0051 in .). Secon d com pr ession r in g ga p .070 t o
ENGINE 9 - 35