Chevrolet 10 1971 Series Chassis Service Manual page 211

4. Install Tool J-23523 on damper then, turning puller
screw, remove damper (fig. 9V).
Tool J-23523 has holes forming two pat­
NOTE:
terns. 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 inertia weight section of the
CAUTION:
torsional damper is assembled to the hub with
a rubber type material. The installation pro­
cedures (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 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" of thread engagement is obtained.
b. Install plate, thrust bearing and nut to complete
tool installation.
c. Pull damper into position as shown in Figure 10V.
d. Remove tool from crankshaft then install damper
retaining bolt and torque to 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
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.
Fig. 8 V — Sealing Bearing Cap
Installation
1. Make certain that cover mounting face and cylinder
block front end face are clean and flat.
2. Coat the oil seal with engine oil and using a new
cover gasket, coated with gasket sealer install cover
and gasket over dowel pins and cylinder block.
3. Install cover screws and torque to specifications.
4. Install water pump as outlined in Section 6K.
5. Install torsional damper as outlined.
6. Install oil pan as outlined.
Oil Seal (Front Cover)
Replacement
With Cover Rem oved
1. With cover removed, pry old seal out of cover from
the front with a large screw driver.
2. Install new seal so that open end of the seal is toward
the inside of cover and drive it into position with
Tool J-23042 on Small V8 engines or Tool J-22102
on Mark IV V8 engines (fig. 11V).
CAUTION:
J-971 may be used as support).
APPLY
SEALANT
SHADED
AREAS ONLY
Fig. 9 V — Removing Torsional Damper
Support cover at seal area. (Tool
Fig. 10V— Installing Torsional Damper
10-30 CHEVROLET TRUCK SERVICE MANUAL
ENGINE 6-33