Chevrolet 10 Series 1968, Service Manual

Page: 366 / 713

ENGINE 6-19
Fig. 9 L—Removing Torsional Damper
2. Remove radiator core, as outlined in Section 13.
3. Remove fan belt and (if so equipped) accessory drive
pulley and belt. If so equipped, remove retaining
bolt.
4. Install Tool J-6978 to damper and turn puller screw
to remove damper (fig. 9L). Remove tool from
damper.
Installation
CA U TIO N :
The inertia weight section of the
torsional damper is assembled to the hub with a
rubber type material. The installation proce­
dures (with proper tool) must be followed or
movement of the inertia weight section on the
hub will destroy the tuning of the torsional
damper.
1. Coat front seal contact area (on damper) with engine
oil.
F ig . 10L—In stalling Torsional Damper
2. Install torsional damper as follows:
DRIVE ON TYPE (Without retaining bolt)
a. Attach damper installer Tool J-22197 to damper.
Tighten fingers of tool to prevent inertia weight
from moving (fig. 10L).
b. Position damper on crankshaft and drive into
position until it bottoms against crankshaft gear
(fig. 10L). Remove installer tool.
PULL ON TYPE (Without retaining bolt)
a. Use a 7/16"-20 x 4" bolt, nut and washer to pull
torsional damper onto crankshaft.
C A U TIO N : Install bolt in crankshaft with suf­
ficient thread engagement (min. 1/2").
b. Remove bolt, nut and washer and install retaining
bolt and torque to specifications.
3. Install fan belt and adjust using strand tension gauge.
4. If so equipped, install accessory drive pulley and
belt.
5. Install radiator core as outlined in Section 13.
6. Connect radiator hoses.
7. F ill cooling system and check for leaks.
Crankcase Front C over
Rem oval
1. Remove oil pan as outlined.
2. Remove crankshaft pulley and hub or damper as
outlined.
3. Remove crankshaft front cover attaching screws,
remove cover and gasket.
Installation
1. Clean gasket surfaces on block and crankcase front
cover.
2. Install centering Tool J-0966 or centering Tool
J -21742 in crankcase front cover seal (fig. 11L).
3. Coat the gasket with gasket sealer and place in posi­
tion on cover, then install crankcase front cover to
block and torque to specifications.
4. Remove centering tool.
NOTE:
It is important that centering tool be
used to align crankcase front cover so that
crankshaft hub or damper installation will not
damage seal and to position seal to seal evenly
around the damper or hub surface.
5. Install crankshaft hub and/or damper as outlined.
6. Install oil pan as outlined.
F ig . 11 L—J —21742 Centering Tool in Cover
CHEVROLET TRUCK SERVICE MANUAL