Chevrolet Light Duty Truck 1973, Service Manual

Page: 366 / 979

6 3 0 ENGINE
6
. Coat seal lips and seal bead with light engine oil —
keep oil off seal mating ends.
7. Position tip of tool between crankshaft and seal seat
in cylinder case.
8
. Position seal between crankshaft and tip of tool so
that seal bead contacts tip of tool.
NOTE: Make sure that oil-seal lip is
positioned toward front of engine (fig. 13L).
9. Roll seal around crankshaft using tool as
a “shoe-horn” to protect seal bead from
sharp corner of seal seat surface in
cylinder case.
CAUTIO N:
Installation tool must remain in
position until seal is properly positioned with
both ends flush with block.
10. Remove tool, being careful not to withdraw seal.
11. Install seal half in bearing cap, again using tool as
a “shoe-horn”, feeding seal into cap using light
pressure with thumb and finger.
12. Install bearing cap to case with sealant applied to
the cap-to-case interface, being careful to keep
sealant off the seal split line (fig. 14L).
Fig. 11L— Removing Oil Seal (Lower Half) Typical
13. Install the rear main bearing cap (with new seal)
and torque to specifications.
Torsional Damper
Removal
1. Drain radiator and disconnect radiator hoses at
radiator.
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-23523 to damper and turn puller
screw to remove damper (fig. 15L). Remove tool
from damper.
Installation
CAUTIO 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 inertial weight section on the
hub will destroy the tuning of the torsional
damper.
1. Coat front seal contact area (on damper) with
engine oil.
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. 16L).
b. Position damper on crankshaft and drive into
position, using J-5590, until it bottoms against
crankshaft gear (fig. 16L). Remove installer tool.
PULL ON TYPE (With retaining bolt)
a. Install 7/16 threaded end of Tool J-23523 into
crankshaft.
Fig. 12L—Removing Oil Seal (Upper Half) Typical
LIGHT DUTY TRUCK SERVICE MANUAL