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6A6-20
1977 PONTIAC SERVICE MANUAL
Fig.
6A6-44
Measuring Crankshaft End Play
Replacement
NOTE: Main Bearings may be replaced with or without
removing the crankshaft.
With Crankshaft Removal
1. Remove and inspect the crankshaft.
2. Remove the main bearings from the cylinder block
and main bearing caps.
3. Coat bearing surfaces of new, correct size main
bearings with oil and install in the cylinder block and main
bearing caps.
4. Install the crankshaft.
Without Crankshaft Removal
1. With oil pan, oil pump and spark plugs removed,
remove cap on main bearing requiring replacement and
remove bearing from cap.
2. Install a main bearing removing and installing tool in
oil hole in crankshaft journal.
NOTE: If such a tool is not available, a cotter pin may
be bent as required to do the job.
3. Rotate the crankshaft clockwise as viewed from the
front of engine. This will roll upper bearing out of block.
4. Oil new selected size upper bearing and insert plain
(unnotched) end between crankshaft and indented or notched
side of block. Rotate the bearing into place and remove tool
from oil hole in crankshaft journal.
5. Oil new lower bearing and install in bearing cap.
6. Install main bearing cap with arrows pointing toward
front of engine.
7. Torque main bearing cap bolts to specifications.
OIL SEAL (REAR MAIN)
Replacement
NOTE: Always replace the upper and lower seal $s a
unit. Install seal with lip facing front of engine.
The rear main bearing oil seal can be replaced (both
halves) without removal of the crankshaft. Extreme care
should be exercised when installing this seal to protect the
sealing bead located in the channel on the outside diameter
of the seal. An installation tool (Fig. 6A6-45) can be used to
protect the seal bead when positioning seal as follows:
.004
SHIM STOCK
Fig.
6A6-45
Oil Seal Installation Tool
1. With the oil pan and oil pump removed, remove the
rear main bearing cap.
2. Remove oil seal from the bearing cap by prying from
the bottom with a small screwdriver (Fig. 6A6-46).
Fig.
6A6-46
Removing Oil Seal (Lower Half)
3. To remove the upper half of the seal, use a small
hammer to tap a brass pin punch on one end of seal until it
protrudes far enough to be removed with pliers (Fig. 6A6-47).
4. Clean all sealant and foreign material from cylinder
case bearing cap and crankshaft, using a non-abrasive cleaner.
5. Inspect components for nicks, scratches, burrs and
machining defects at all sealing surfaces, case assembly and
crankshaft.
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. 6A6-48).
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