Timing Chain Cover, Oil Seal And Chain; Cover Removal; Measuring Timing Chain For Stretch; Measuring Timing Chain Wear And Stretch - Dodge D150 1990 Service Manual

(5) The t i m i n g o f t h e crankshaft pulley should now
read f r o m 10° before top dead center t o 2° after top
dead center. Remove spacer. I f reading is not w i t h i n
specified l i m i t s :
(a) Check sprocket index marks.
(b) Inspect t i m i n g chain for wear.
(c) Check accuracy o f 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 w a t e r 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) a n d p u l l v i b r a t i o n damper from end
of crankshaft (Fig. 3).
(6) Remove fuel lines.
(7) Loosen o i l p a n bolts a n d remove the front bolt
at each side.
(8) Remove c h a i n case cover and gasket u s i n g ex-
treme c a u t i o n t o avoid damaging o i l pan gasket.
Fig. 3 Removing Vibration Damper Assembly
MEASURING TIMING CHAIN FOR STRETCH
(1) Place a scale next to t i m i n g chain so t h a t any
movement o f c h a i n m a y be measured.
(2) Place a torque wrench and socket over camshaft
sprocket a t t a c h i n g b o l t and apply torque i n the direc-
t i o n 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 n n
(15 ft. lbs.) (cylinder heads removed). W i t h a torque
applied t o t h e camshaft sprocket bolt, crankshaft
should not be p e r m i t t e d to move. I t may be necessary
to block crankshaft t o prevent rotation.
(3) H o l d i n g a scale w i t h dimensional reading even
w i t h edge of a chain l i n k , apply torque i n the reverse
direction 14 N n n (30 ft. lbs.) ( w i t h cylinder heads i n -
stalled) or 20 N n n (15 f t . lbs.) (cylinder heads re-
moved) and note a m o u n t of chain movement (Fig. 4).
Fig. 4 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 3.175mm (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
c h a i n w i t h crankshaft and camshaft sprockets.
(6) Place both camshaft sprocket and crankshaft
sprocket o n the bench w i t h t i m i n g m a r k s o n exact
i m a g i n a r y center line t h r o u g h both camshaft a n d
crankshaft bores.
(7) Place t i m i n g chain around b o t h sprockets.
(8) T u r n crankshaft and camshaft t o l i n e u p 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 s t r a i g h t edge to check a l i g n -
m e n t o f t i m i n g m a r k s (Fig. 5).
(11) I n s t a l l t h e cup washer, and camshaft bolt.
T i g h t e n t h e bolt t o 47 N n n (35 ft. lbs.) torque.
(12) Check camshaft for O.OSlto 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 a n d
up t o 0.254 m m (0.010 inch) end play w i t h a used
t h r u s t plate. I f not w i t h i n these l i m i t s i n s t a l l a new
t h r u s t plate.
Fig. 5 Alignment of Timing Marks