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ENGINE 6-19
OIL SEAL (REAR MAIN)
Replacement
The rear main bearing oil seal can be replaced (both
halves) without removal of the crankshaft.
NOTE:
Always replace the upper and lower
seal as a unit. Install with the lip facing toward
the front of the engine.
1. With the oil pan removed, remove the rear main
bearing cap.
2. Remove oil seal from the groove by lifting the end
tab (fig. 7L) then clean seal groove.
3. Lubricate the lip and O.D. of a new seal with engine
oil. Keep oil off the parting line surface. Insert
seal in cap and roll it into place with finger and
thumb, using light pressure so beads on seal O.D.
are not cut by seal groove at cap parting line. Be
sure tabs on seal are properly located in cross
grooves.
4. To remove the upper half of the seal, use a small
hammer to tap a brass pin punch on one end of seal
until it protrudes far enough to be removed with
pliers (fig. 8L).
NOTE:
Always clean crankshaft surface re-
moving all foreign deposits before installing a
new seal. Also clean seal groove.
5. Lubricate the lip and O.D. of a new seal with engine
oil. Keep oil off the parting line surface. Gradually
push with a hammer handle, while turning crank-
shaft, until seal is rolled into place. (Similar to in-
stalling a main bearing.) Be careful that seal bead
on O.D. is not cut. Compress seal towards crank-
shaft as much as possible.
6. Install the rear main bearing cap (with new seal) and
torque to specifications. Be sure cross seal tabs
are in place and properly seated.
CRANKSHAFT PULLEY AND HUB
(Chevy II with L4 Engine)
Removal
1. Drain radiator and disconnect upper and lower radi-
ator hoses at radiator.
2. Remove radiator core as outlined in Section 13.
3. Remove fan belt. Remove crankshaft pulley from
pulley hub.
4. Install puller Tool J-6978 to pulley hub with two
3/8" x 2" and one 5/16" x 2" bolts and remove hub
then remove puller tool.
Installation
1. Coat oil seal contact area on hub with engine oil
position hub over crankshaft and key and start hub
into position with a mallet. Using Tool J-5590 drive
onto crankshaft until it bottoms against crankshaft
gear.
NOTE:
Crankshaft extends slightly through hub
and a tool is necessary to drive hub completely
into bottomed position.
2. Install pulley onto hub.
NOTE:
There are two 3/8" holes and one
5/16" hole that must be matched on hub in order
Fig. 9L - Removing Torsional Damper
to properly position timing mark.
3. Install fan belt and adjust using strand tension gauge.
4. Install radiator as outlined in Section 13.
TORSIONAL DAMPER
Removal
1. Remove radiator core, as outlined in Section 13.
2. Remove fan belt and (if so equipped) accessory drive
pulley and belt.
3. Install Tool J-6978 to damper and turn puller screw
to remove damper (fig. 9L). Remove tool.
Installation
1. Coat front cover oil seal contact area of damper with
engine oil.
CAUTION:
It is necessary to use installer
Tool J-22197 to prevent the inertia weight sec-
Fig. 10L - Installing Torsional Damper
CHEVROLET CHASSIS SERVICE MANUAL
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