Jeep Cherokee 1999 Electronic Service Manual page 1155

9 - 42 ENGINE
REM OVAL AN D I N STALLAT I ON (Cont inue d)
(29) In st a ll t h e oil pick u p t u be. Tor qu e bolt s t o 25
N·m (18 ft . lbs.).
(30) In st a ll t h e oil pa n . Refer t o oil pa n r em ova l
a n d in st a lla t ion in t h is sect ion .
(31) In st a ll t h e va cu u m pu m p, bein g ca r efu l t o
a lign t h e gea r t im in g m a r ks wit h t h ose on t h e cr a n k-
sh a ft gea r. Tor qu e scr ews t o 20 N·m (15 ft . lbs.).
(32) Befor e in st a llin g t h e oil pu m p ch eck pu m p
bor e dept h in block (A) a n d pu m p body h eigh t (B)
(F ig. 72). Differ en ce bet ween A a n d B sh ou ld be
0.020-0.082 m m (.0007 t o 0032 in .).
Fig. 72 Oil Pump Bore Depth
(33) In st a ll t h e oil pu m p. Tor qu e scr ews t o 27 N·M
(20 ft . lbs.). Ch eck for n or m a l ba ckla sh bet ween
pu m p a n d cr a n ksh a ft gea r s.
(34) In st a ll t h e t im in g gea r cover. Refer t o t im in g
gea r cover r em ova l a n d in st a lla t ion in t h is sect ion .
(35) In st a ll t h e vibr a t ion da m per. Refer t o vibr a -
t ion da m per r em ova l a n d in st a lla t ion in t h is sect ion .
(36) In st a ll t h e cylin der h ea ds. Refer t o cylin der
h ea d r em ova l a n d in st a lla t ion in t h is sect ion .
(37) In st a ll t h e r ocker a r m s 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 .
(38) 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 sec-
t ion .
(39) In st a ll t h e a ccessa r y dr ive syst em .
(40) In st a ll t h e en gin e in veh icle. Refer t o en gin e
r em ova l a n d in st a lla t ion in t h is sect ion .
(41) F ill en gin e wit h t h e cor r ect a m ou n t of flu ids
specified.
(42) Con n ect t h e n ega t ive ba t t er y ca ble.
DI SASSEM BLY AN D ASSEM BLY
HYDRAULIC TAPPETS
DISASSEMBLE
(1) P r y ou t plu n ger r et a in er spr in g clip.
(2) Clea n va r n ish deposit s fr om in side of t a ppet
body a bove plu n ger ca p.
(3) In ver t t a ppet body a n d r em ove plu n ger ca p,
plu n ger, ch eck va lve, ch eck va lve spr in g, ch eck va lve
r et a in er a n d plu n ger spr in g. Ch eck va lve cou ld be
fla t or ba ll.
ASSEMBLE
(1) Clea n a ll t a ppet pa r t s in a solven t t h a t will
r em ove a ll va r n ish a n d ca r bon .
(2) Repla ce t a ppet s t h a t a r e u n fit for fu r t h er ser-
vice wit h n ew a ssem blies.
(3) If plu n ger sh ows sign s of scor in g or wea r,
in st a ll a n ew t a ppet a ssem bly. If va lve is pit t ed, or
va lve sea t on en d of plu n ger is pr even t ed fr om sea t -
in g, in st a ll a n ew t a ppet a ssem bly.
(4) Assem ble t a ppet s.
CLEAN I N G AN D I N SPECT I ON
CYLINDER HEAD
CLEANING
Th or ou gh ly clea n t h e en gin e cylin der h ea d a n d cyl-
in der block m a t in g su r fa ces. Clea n t h e in t a ke a n d
exh a u st m a n ifold a n d en gin e cylin der h ea d m a t in g
su r fa ces. Rem ove a ll ga sket m a t er ia l a n d ca r bon .
Ch eck t o en su r e t h a t n o coola n t or for eign m a t er ia l
h a s fa llen in t o t h e t a ppet bor e a r ea .
Rem ove t h e ca r bon deposit s fr om t h e com bu st ion
ch a m ber s a n d t op of t h e pist on s.
INSPECTION
Use a st r a igh t edge a n d feeler ga u ge t o ch eck t h e
fla t n ess of t h e en gin e cylin der h ea d a n d block m a t in g
su r fa ces (F ig. 73).
Min im u m cylin der h ea d t h ickn ess 89.95m m (3.541
in .)
CAUTION: If only one cylinder head is found to be
distorted and requires machining, it will also be
necessary to machine the remaining cylinders
heads and end plates by a corresponding amount
to maintain correct cylinder alignment.
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