Crakshaft Vibration Damper And Pulley Removal - Jeep 1987 Wrangler Workshop Manual

ENGINES
in
4.2 LITER (258 CID) SIX-CYLINDER ENGINE
in
S E E
N
O
T
E
S
Remove the capscrews, bridge and pivot
assembly, and rocker arms from above the No. 1
cylinder.
Alternately loosen each capscrew, one turn at a
time, to avoid damaging the bridge,
Rotate the crankshaft until the No. 6 piston is at
top dead center (TDC) on the compression
stroke.
Rotate the crankshaft counterclockwise (viewed
from the front of the engine) 90 degrees.
Install a dial indicator (J-8520 or equivalent) on
the end of the No. 1 cylinder intake valve push
rod. Use rubber tubing to secure the indicator
stem on the push rod.
Set the dial indicator pointer at zero.
Rotate the crankshaft clockwise (viewed from
the front of the engine) until the dial indicator
pointer indicates 0.305mm (0.012-in) travel
distance (lift).
The timing notch index on the vibration damper
should be aligned with the T D C mark on the
timing degree scale.
If the timing notch is more than 13mm (1/2-in)
away from the T D C mark in either direction, the
valve timing is incorrect.
CRANKSHAFT
VIBRATION
DA1PER AND
PULLEY
REMOVAL
Remove the drive belt(s).
Remove the retaining bolts and separate the
vibration damper pulley (V-belt ONLY) from the
vibration damper.
Remove the vibration damper retaining bolt and
washer.
Use the Vibration Damper Removal Tool
J-21791-01 to remove the damper from the
crankshaft.
J-21791-01
84179
If the valve timing is incorrect, the cause may be
a broken camshaft pin. It is not necessary to
replace the camshaft because of pin failure. A
spring pin is available for service replacement.