Jeep Cherokee 1999 Electronic Service Manual page 1137

9 - 24 ENGINE
REM OVAL AN D I N STALLAT I ON (Cont inue d)
ROCKER ARMS AND PUSH RODS
REMOVAL
(1) Discon n ect t h e n ega t ive ba t t er y ca ble.
(2) Disch a r ge t h e
equ ipped. Refer t o Gr ou p 24, H ea t in g a n d Air Con di-
t ion in g for pr ocedu r e.
(3) If equ ipped wit h a ir con dit ion in g, r em ove t h e
ser vice va lves a n d ca p t h e com pr essor por t s. Refer t o
Gr ou p 24, H ea t in g a n d Air Con dit ion in g.
(4) Rem ove t h e gen er a t or br a cket .
(5) Rem ove t h e cylin der h ea d cover. Refer t o cylin -
der h ea d cover r em ova l a n d in st a lla t ion in t h is sec-
t ion .
(6) Rem ove t h e r ocker a r m r et a in in g n u t (F ig. 29).
Fig. 29 Rocker Arm Retaining Nut
(7) Rem ove t h e r ocker a ssem bly. P la ce t h em on a
ben ch in t h e sa m e or der a s r em oved.
(8) Rem ove t h e pu sh r ods a n d pla ce t h em on a
ben ch in t h e sa m e or der a s r em oved.
INSTALLA TION
(1) Rot a t e t h e cr a n ksh a ft u n t il t h e m a r k lin es u p
wit h t h e TDC m a r k on t h e t im in g cover.
(2) In st a ll t h e pu sh r ods in t h e sa m e or der a s
r em oved.
(3) In st a ll t h e r ocker a r m a ssem blies in t h e sa m e
or der a s r em oved. Tor qu e n u t s t o 29.4 N·m (264 in .
lbs.).
(4) In st a ll t h e cylin der h ea d cover. Refer t o cylin -
der h ea d cover r em ova l a n d in st a lla t ion in t h is
gr ou p.
a ir con dit ion in g syst em , if
(5) In st a ll t h e gen er a t or br a cket . Tor qu e bolt s t o 7
N·m (4 ft . lbs.).
(6) If equ ipped, eva cu a t e a n d ch a r ge t h e a ir con di-
t ion in g syst em . Refer t o Gr ou p 24, H ea t er a n d Air
Con dit ion in g.
(7) Con n ect t h e n ega t ive ba t t er y ca ble.
VALVE SPRINGS
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
(1) Discon n ect t h e n ega t ive ba t t er y ca ble.
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.
(2) Rem ove t h e cylin der h ea d cover. Refer t o cylin -
der h ea d cover r em ova l a n d in st a lla t ion in t h is sec-
t ion .
(3) Rem ove t h e r ocker a r m s a ssem blies a n d pu sh
r ods. Refer t o r ocker a r m a n d pu sh r od r em ova l a n d
in st a lla t ion in t h is sect ion . Ret a in t h e pu sh r ods, a n d
r ocker a r m s a ssem blies in t h e sa m e or der a n d posi-
t ion a s r em oved.
(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) In st a ll a n a ir h ose a da pt or in t h e fu el in ject or
h ole.
(6) 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.
(7) 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 t o com pr ess t h e spr in g a n d r em ove
t h e locks.
(8) Rem ove t h e va lve spr in g a n d r et a in er.
(9) 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.
INSTALLA TION
(1) In st a ll t h e va lve spr in g a n d r et a in er.
(2) Com pr ess t h e va lve spr in g wit h Va lve Spr in g
Com pr essor Tool 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.
(3) Discon n ect t h e a ir h ose. Rem ove t h e a da pt or
fr om t h e fu el in ject or h ole a n d in st a ll t h e fu el in jec-
t or.
(4) 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.
(5) 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 .
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