Chrysler RAM TRUCK 2500 1994 Service Manual page 830

(3) Install the serpentine belt (refer to Group 7,
Cooling System).
(4) Install the cooling system fan.
(5) Position the fan shroud and install the bolts.
(6) Connect the negative cable to the battery.
TIMING CHAIN COVER
REMOWAL
(1) Disconnect the negative cable from the battery.
(2) Drain cooling system (refer to Group 7, Cooling
System).
(3) Remove the serpentine belt (refer to Group 7,
Cooling System).
(4) Remove water pump (refer to Group 7, Cooling
System).
(5) Remove power steering pump (refer to Group
19, Steering).
(6) Remove crankshaft pulley/damper.
(7) Remove fuel lines (refer to Group 14, Fuel Sys­
tem).
(8) Loosen oil pan bolts and remove the front oil
pan bolts that mount the pan to the timing chain
cover.
(9) Remove the cover bolts.
(10) Remove timing chain cover and gasket using
extreme caution to avoid damaging oil pan gasket.
(11) Place a suitable tool behind the lips of the oil
seal to pry the oil seal outward. Be careful not to
damage the crankshaft seal surface of the cover (Fig.
3).
J9409-68
Fig. 3 Timing Chain Cover and Oil Seal
(12) Inspect surface of cover. Remove any burrs or
high spots.
TIMING CHAIN STRETCH
(1) Place a scale next to the timing chain so that
any movement of the chain may be measured.
(2) Place a torque wrench and socket over, cam­
shaft sprocket attaching bolt. Apply torque i n the di­
rection of crankshaft rotation to take up slack; 41
N-m (30 ft. lbs.) torque with cylinder head installed
or 20 N-m (15 ft. lbs.) torque with cylinder head re­
moved. With a torque applied to the camshaft
sprocket bolt, crankshaft should not be permitted to
move. I t may be necessary to block the crankshaft to
prevent rotation.
(3) Hold a scale with dimensional reading even
with the edge of a chain link. With cylinder heads in­
stalled, apply 14 N-m (30 ft. lbs.) torque i n the re­
verse direction. With the cylinder heads removed,
apply 20 N-m (15 ft. lbs.) torque i n the reverse direc­
tion. Note the amount of chain movement (Fig. 4).
Fig. 4 Measuring Timing Chain Wear and Stretch
(4) Install a new timing chain, i f its movement ex­
ceeds 3.175 mm (1/8 inch).
(5) I f chain is not satisfactory, remove camshaft
sprocket attaching bolt and remove timing chain with
crankshaft and camshaft sprockets.
(6) Place both camshaft sprocket and crankshaft
sprocket on the bench with timing marks on exact
imaginary center line through both camshaft and
crankshaft bores.
(7) Place timing chain around both sprockets.
(8) Turn crankshaft and camshaft to line up with
keyway location i n crankshaft sprocket and i n cam­
shaft sprocket.
(9) Lift sprockets and chain (keep sprockets tight
against the chain i n position as described).
(10) Slide both sprockets evenly over their respec­
tive shafts and use a straightedge to check alignment
of timing marks (Fig. 5).
(11) Install the camshaft bolt. Tighten the bolt to
47 N-m (35 ft. lbs.) torque.
(12) Check camshaft end play. The end play should
be 0.051-0.152 mm (0.002-0.006 inch) with a new
thrust plate and up to 0.254 mm (0.010 inch) with a
used thrust plate. I f not within these limits install a
new thrust plate.
CLEANING
Be sure mating surfaces of timing chain cover and
cylinder block are clean and free from burrs.