Chevrolet Light Duty Truck 1973 Service Manual page 391

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. 14V).
9. Roll seal around crankshaft using tool as a
"shoehorn" to protect seal bead from sharp corner
of seal seat surface in cylinder case.
Installation tool must remain in
CAUTION:
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 "shoehorn", 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. 15 V).
13. Install the rear main bearing cap (with new seal)
and torque to specifications.
Torsional Damper
Removal
1. Remove fan belt, fan and pulley.
2. Remove the radiator shroud assembly as outlined in
Section 13.
NOTE: If additional operations (such as
camshaft removal) are not being performed,
the radiator removal will not be necessary.
3. Remove accessory drive pulley then remove damper
retaining bolt.
4. Install Tool J-23523 on damper then, turning puller
screw, remove damper (fig. 16V).
DUST SEAL
OIL SEAL
Fig. 14V—Crankshaft Oil Seal (Rear Main)
NOTE: Tool J-23523 has holes forming two
patterns. A two bolt and a three bolt pattern.
The holes for the two bolt pattern must be
elongated for use on the Mark IV V8 engines.
Installation
The inertial weight section o f the
CAUTION:
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 o f the torsional
damper.
1. Coat front cover seal contact area (on damper) with
engine oil.
2. Place damper in position over key on crankshaft.
3. Pull damper onto crankshaft as follows:
a. Install appropriate threaded end of Tool J-23523
into crankshaft.
Install tool in crankshaft so that at
CAUTION:
least 1/2" o f thread engagement is obtained.
b. Install plate, thrust bearing and nut to complete
tool installation.
c. Pull damper into position as shown in Figure
17 V.
d. Remove tool from crankshaft then install
damper retaining
specifications.
4. Install accessory drive pulley.
5. Install radiator shroud as outlined in Section 13.
6. Install fan and pulley to water pump hub and
tighten securely.
7. Install fan belt and adjust to specifications using
strand tension gauge.
8. Fill cooling system, start engine and check for
leaks.
Crankcase Front Cover
Removal
Small V8 Engine
1. Remove oil pan as outlined.
2. Remove torsional damper as outlined.
3. Remove water pump as outlined in Section 6K.
4. Remove crankcase front cover attaching screws and
remove front cover and gasket, then discard gasket.
M ark IV V8 Engine
1. Remove torsional damper and water pump as
outlined.
2. Remove the two, oil pan-to-front cover attaching
screws.
3. Remove the front cover-to-block attaching screws.
E N G I N E 6 - 5 5
bolt and torque to
LIGHT DUTY TRUCK SERVICE MANUAL