Chevrolet 1977 light duty truck, Service Manual

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N O T E : Tool J-23523 has holes form ing two
patterns. A two bolt and a three bolt pattern. The
holes for the two bolt p a tte rn must be elongated
for use on the M ark IV V8 engines.
Installation
CAUTION:
The inertial weight section o f the
torsional dam per is assembled to the hub with a
rubber type material. The installation proce­
dures (with proper tool) m ust be fo llo w ed or
m ovem ent o f the inertia weight section on the
hub will destroy the turning o f the torsional
damper.
1. Coat front cover seal contact area (on dam p er)
with engine oil.
2. Place d a m p e r in position over key on
crankshaft.
3. Pull d a m p e r onto c ra n k sh a ft as follows:
a. Install a p p ro p ria te threaded end o f Tool
J-23523 into crankshaft.
CAUTION: Install tool in crankshaft so that at
least 1 /2 " o f thread engagem ent is obtained.
b. Install plate, thrust bearing and nut to
complete tool installation.
c. Pull d a m p e r into position as shown in Figure
6A-38V.
d. Remove tool from c ra n k sh a ft then install
d a m p e r retain in g bolt and torque to specifications.
4. Install accessory drive pulley.
5. Install ra d ia to r shroud as outlined in Section 6B.
6. Install fan and pulley to w ater pu m p hub and
tighten securely.
7. Install fa n belt and adjust to specifications using
strand tension gauge.
8. Fill cooling system, start engine and check for
leaks.
C R A N K C A SE F R O N T COVER
Removal
Sm all V8 Engine
1. Rem ove torsional d a m p e r as previously
outlined.
2. Remove w ater pum p as outlined in Section 6B.
3. Remove crankcase front cover attaching screws
and remove front cover and gasket, then discard gasket.
M ark IV V8 Engine
1. Remove torsional d a m p e r and w ater p u m p as
outlined.
2. Remove the two. oil p an-to-front cover attach­
ing screws.
3. Remove the fro n t cover-to-block attaching
screws.
4. Pull the cover slightly forward only enough to
p erm it cutting o f oil p a n front seal.
5. Using a sh a rp knife or other suitable cutting
tool, cut oil p a n fro n t seal flush with cylinder block at
both sides o f cover (fig. 6A-39V).
6. Remove front cover and attaching portion o f oil
pan front seal. Remove fro n t cover gasket.
Installation
Sm all V8 Engine
1. Clean gasket surface on block and crankcase
front cover.
2. Use a sharp knife or other suitable cutting tool,
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