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5.2L/5.9L ENGINE
9 - 49
(2) Insert a 6.350 m m (1/4 inch) spacer
between
rocker a r m pad a n d stem t i p of No. 1 i n t a k e valve.
A l l o w s p r i n g load t o bleed tappet down g i v i n g i n ef-
fect a solid tappet.
(3) I n s t a l l a d i a l i n d i c a t o r so plunger contacts valve
spring retainer as n e a r l y perpendicular as possible.
Zero the indicator.
(4) Rotate the crankshaft clockwise (normal r u n -
n i n g direction) u n t i l t h e valve has lifted 0.254 m m
(0.010 inch) for 5.2L engines, 0.863 m m (0.034 inch)
for 5.9L engine.
CAUTION:
Do not turn crankshaft any further clock-
wise as valve spring might bottom and result in se-
rious damage.
The t i m i n g of t h e crankshaft pulley should now
read from 10° before top dead center to 2° top dead
center. Remove spacer.
(5) I f reading is n o t w i t h i n specified l i m i t s :
(a) Check sprocket index m a r k s .
(b) Inspect t i m i n g chain for wear.
(c) Check accuracy of DC m a r k on t i m i n g i n d i -
cator.
TIMING CHAIN COVER, OIL SEAL AND CHAIN
COVER
REMOVAL
(1) D r a i n cooling system.
(2) Refer to Group 7, Cooling System for procedure
to remove water p u m p .
(3) Remove power steering pump.
(4) Remove p u l l e y f r o m v i b r a t i o n damper and bolt
and washer securing v i b r a t i o n damper on crankshaft.
(5) I n s t a l l bar f r o m Tool (C-3688) and screw from
Tool (C-3732A) and p u l l v i b r a t i o n damper from end
of crankshaft (Fig. 2).
(6) Remove fuel lines.
(7) Loosen o i l p a n bolts and remove the front bolt
a t each side.
(8) Remove chain case cover and gasket u s i n g ex-
treme caution t o avoid damaging o i l pan gasket.
Fig. 2 Removing Vibration Damper with Tool C-3688
MEASURING
TIMING CHAIN FOR
STRETCH
(1) Place a scale next to the t i m i n g chain so t h a t
any movement o f t h e chain may be measured.
(2) Place a torque wrench and socket over camshaft
sprocket a t t a c h i n g bolt and apply torque i n direction
of crankshaft r o t a t i o n t o take up slack; 4 1 N n n (30
ft. lbs.) w i t h (cylinder head installed) or 20 N»m (15
ft. lbs.) (cylinder heads removed). W i t h a torque ap-
plied
t o t h e camshaft
sprocket
bolt, crankshaft
should n o t be p e r m i t t e d to move. I t may be necessary
to block t h e crankshaft t o prevent r o t a t i o n .
(3) H o l d i n g a scale w i t h dimensional reading even
w i t h t h e edge o f a c h a i n l i n k , apply torque i n the re-
verse d i r e c t i o n 14 N*m (30 f t . lbs.) ( w i t h cylinder
heads installed) or 20 N»m (15 f t . lbs.) (cylinder
heads removed) and note amount o f chain movement
(Fig. 3).
Fig. 3 Measuring
Timing Chain Wear and
Stretch
(4) I n s t a l l a new t i m i n g chain, i f its movement ex-
ceeds 3.175 m m (1/8 inch).
(5) I f c h a i n is not satisfactory, remove camshaft
sprocket a t t a c h i n g cup washer, and remove t i m i n g
chain w i t h crankshaft and camshaft sprockets.
(6) Place both camshaft sprocket and crankshaft
sprocket o n t h e bench w i t h t i m i n g marks o n exact
i m a g i n a r y center l i n e t h r o u g h b o t h camshaft and
crankshaft bores.
(7) Place t i m i n g c h a i n around both sprockets.
(8) T u r n crankshaft and camshaft t o line up w i t h
keyway location i n crankshaft sprocket and i n cam-
shaft sprocket.
(9) L i f t sprockets and chain (keep sprockets t i g h t
against t h e chain i n position as described).
(10) Slide both sprockets evenly over t h e i r respec-
t i v e shafts and use a straightedge to check alignment
of t i m i n g m a r k s (Fig. 4).
(11) I n s t a l l t h e cup washer, and camshaft bolt.
T i g h t e n b o l t t o 47 N-m (35 ft. lbs.).
(12) Check camshaft for 0.051 to 0.0152 m m (0.002
to 0.006 inch) end play w i t h a new t h r u s t plate and
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