Jeep Cherokee 1999 Electronic Service Manual page 1050

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REM OVAL AN D I N STALLAT I ON (Cont inue d)
CAUTION: Install oil seals carefully to prevent dam-
age from the sharp edges of the valve spring lock
grove.
(1) Ligh t ly pu sh t h e va lve sea l over t h e va lve st em
a n d va lve gu ide boss. Be su r e t h e sea l is com plet ely
sea t ed on t h e va lve gu ide boss.
(2) In st a ll va lve spr in g a n d r et a in er.
(3) Com pr ess t h e va lve spr in g wit h Va lve Spr in g
Com pr essor Tool MD-998772A a n d in ser t t h e va lve
locks. Relea se t h e spr in g t en sion a n d r em ove t h e
t ool. Ta p t h e spr in g fr om side-t o-side t o en su r e t h a t
t h e spr in g is sea t ed pr oper ly on t h e en gin e cylin der
h ea d.
(4) Relea se a ir pr essu r e a n d discon n ect t h e a ir
h ose. Rem ove t h e a da pt or fr om t h e spa r k plu g h ole
a n d in st a ll t h e spa r k plu g.
(5) Repea t t h e pr ocedu r es for ea ch r em a in in g va lve
spr in g t o be r em oved.
(6) In st a ll t h e pu sh r ods. E n su r e t h e bot t om en d of
ea ch r od is cen t er ed in t h e plu n ger ca p sea t of t h e
h ydr a u lic va lve t a ppet .
(7) In st a ll t h e r ocker a r m s, pivot s a n d br idge a t
t h eir or igin a l loca t ion .
(8) Tigh t en t h e br idge ca p scr ews a lt er n a t ely, on e
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 p scr ews t o 28 N·m (21 ft . lbs.) t or qu e.
(9) In st a ll t h e en gin e cylin der h ea d cover.
CYLINDER HEAD
Th is pr ocedu r e ca n be don e wit h t h e en gin e in or
ou t of t h e veh icle.
REMOVAL
(1) Discon n ect n ega t ive ca ble fr om ba t t er y.
WARNING: DO NOT
BLOCK DRAIN PLUGS OR LOOSEN THE RADIATOR
DRAIN COCK WITH THE SYSTEM HOT AND PRES-
SURIZED BECAUSE SERIOUS BURNS FROM THE
COOLANT CAN OCCUR.
(2) Dr a in t h e coola n t a n d discon n ect t h e h oses a t
t h e en gin e t h er m ost a t h ou sin g. DO NOT wa st e r eu s-
a ble coola n t . If t h e solu t ion is clea n a n d is bein g
dr a in ed on ly t o ser vice t h e en gin e or coolin g syst em ,
dr a in t h e coola n t in t o a clea n con t a in er for r eu se.
(3) Rem ove t h e a ir clea n er a ssem bly.
(4) 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 )
(5) Rem ove t h e ca pscr ews, br idge a n d pivot a ssem -
blies a n d r ocker a r m s (F ig. 33).
(6) Rem ove t h e pu sh r ods (F ig. 33). 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 s re m o v e d .
(7) Loosen t h e a ccessor y dr ive belt a t t h e power
st eer in g pu m p br a cket , if equ ipped or a t t h e idler
REMOVE THE CYLINDER
Fig. 33 Rocker Arm Assembly
pu lley br a cket (r efer t o Gr ou p 7, Coolin g Syst em for
t h e pr oper pr ocedu r e).
(8) If equ ipped wit h a ir con dit ion in g, per for m t h e
followin g:
(a ) Rem ove t h e bolt s fr om t h e A/C com pr essor
m ou n t in g br a cket a n d set t h e com pr essor a side.
(b) Rem ove t h e
br a cket bolt s fr om t h e en gin e cylin der h ea d.
(c) Loosen t h e t h r ou gh bolt a t t h e bot t om of t h e
br a cket .
(9) If equ ipped, discon n ect t h e power st eer in g
pu m p br a cket . Set t h e pu m p a n d br a cket a side. DO
NOT discon n ect t h e h oses.
(10) P er for m fu el
(Refer t o Gr ou p 14, fu el syst em s for pr oper pr oce-
du r es).
(11) Rem ove t h e la t ch clip a n d discon n ect t h e fu el
su pply h ose.
(12) Rem ove t h e in t a ke a n d en gin e exh a u st m a n i-
folds fr om t h e en gin e cylin der h ea d (r efer t o Gr ou p
11, E xh a u st Syst em a n d In t a ke Ma n ifold for t h e
pr oper pr ocedu r es).
(13) Nu m ber a n d discon n ect t h e ign it ion wir es a n d
r em ove t h e spa r k plu gs.
(14) Discon n ect t h e coola n t t em per a t u r e sen din g
u n it con n ect or.
(15) Rem ove t h e en gin e cylin der h ea d bolt s.
(16) Rem ove t h e en gin e cylin der h ea d a n d ga sket
(F ig. 34).
(17) If t h is wa s t h e fir st t im e t h e bolt s wer e
r em oved, pu t a pa in t da b on t h e t op of t h e bolt . If t h e
bolt s h a ve a pa in t da b on t h e t op of t h e bolt or it
isn 't kn own if t h ey wer e u sed befor e, disca r d t h e
bolt s.
2.5L ENGINE
a ir con dit ion er com pr essor
pr essu r e r elea se pr ocedu r e
9 - 33