Jeep Cherokee 1999 Electronic Service Manual page 1049

9 - 32 2.5L ENGINE
REM OVAL AN D I N STALLAT I ON (Cont inue d)
Fig. 31 Rocker Arm Assembly
(6) Clea n a ll t h e com pon en t s wit h clea n in g sol-
ven t .
(7) Use com pr essed a ir t o blow ou t t h e oil pa ssa ges
in t h e r ocker a r m s a n d pu sh r ods.
INSTALLA TION
(1) Lu br ica t e t h e ba ll en ds of t h e pu sh r ods wit h
Mopa r E n gin e Oil Su pplem en t , or equ iva len t a n d
in st a ll pu sh r ods in t h eir or igin a l loca t ion s. E n su r e
t h a t t h e bot t om en d of ea ch pu sh r od is cen t er ed in
t h e t a ppet plu n ger ca p sea t .
(2) Usin g Mopa r E n gin e Oil Su pplem en t , or equ iv-
a len t , lu br ica t e t h e a r ea of t h e r ocker a r m t h a t t h e
pivot con t a ct s. In st a ll r ocker a r m s, pivot s a n d br idge
a bove ea ch cylin der in t h eir or igin a l posit ion .
(3) Loosely in st a ll t h e ca pscr ews t h r ou gh ea ch
br idge.
(4) At ea ch br idge, t igh t en t h e ca pscr ews a lt er-
n a t ely, on e t u r n a t a t im e, t o a void da m a gin g t h e
br idge. Tigh t en t h e ca pscr ews t o 28 N·m (21 ft . lbs.)
t or qu e.
(5) In st a ll t h e en gin e cylin der h ea d cover.
VALVE SPRINGS AND OIL SEALS
Th is pr ocedu r e ca n be don e wit h t h e en gin e cylin -
der h ea d in st a lled on t h e block.
REMOVAL
E a ch va lve spr in g is h eld in pla ce by a r et a in er
a n d a set of con ica l va lve locks. Th e locks ca n be
r em oved on ly by com pr essin g t h e va lve spr in g.
(1) Rem ove t h e en gin e cylin der h ea d cover. Refer
t o pr ocedu r e in t h is sect ion .
(2) Rem ove ca p scr ews, br idge a n d pivot a ssem -
blies a n d r ocker a r m s for a ccess t o ea ch va lve spr in g
t o be r em oved.
(3) Rem ove pu sh r ods. Re ta in th e p u s h ro d s ,
brid g e s , p iv o ts a n d ro c k e r a rm s in th e s a m e
o rd e r a n d p o s itio n a s re m o v e d .
(4) In spect t h e spr in gs a n d r et a in er for cr a cks a n d
possible sign s of wea ken in g.
(5) Rem ove t h e spa r k plu g(s) a dja cen t t o t h e cylin -
der (s) below t h e va lve spr in gs t o be r em oved.
(6) In st a ll a 14 m m (1/2 in ch ) (t h r ea d size) a ir h ose
a da pt or in t h e spa r k plu g h ole.
(7) Con n ect a n a ir h ose t o t h e a da pt er a n d a pply
a ir pr essu r e slowly. Ma in t a in a t lea st 621 kP a (90
psi) of a ir pr essu r e in t h e cylin der t o h old t h e va lves
a ga in st t h eir sea t s. F or veh icles equ ipped wit h a n a ir
con dit ion er, u se a flexible a ir a da pt or wh en ser vicin g
t h e No.1 cylin der.
(8) Ta p t h e r et a in er or t ip wit h a r a wh ide h a m m er
t o loosen t h e lock fr om t h e r et a in er. Use Va lve Spr in g
Com pr essor Tool MD-998772A t o com pr ess t h e spr in g
a n d r em ove t h e locks (F ig. 32).
(9) Rem ove va lve spr in g a n d r et a in er (F ig. 32).
(10) Rem ove va lve st em oil sea ls (F ig. 32). Not e
t h e va lve sea ls a r e differ en t for in t a ke a n d exh a u st
va lves. Th e t op of ea ch sea l is m a r ked eit h er INT
(in t a ke/bla ck in color ) or E XH (exh a u st /br own in
color ). DO NOT m ix t h e sea ls.
Fig. 32 Valve and Valve Components
INSTALLA TION
In spect t h e va lve st em s, especia lly t h e gr ooves. An
Ar ka n sa s sm oot h st on e sh ou ld be u sed t o r em ove
n icks a n d h igh spot s.
X J