Chevrolet 1977 light duty truck, Service Manual

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plain (unnotched) end between crankshaft and indented
or notched side o f block. Rotate the bearing into place
and remove tool from oil hole in crankshaft jo urnal.
5. Oil new lower bearing and install in bearing
cap.
6. Install m ain bearing cap with arrows pointing
toward front o f engine.
7. Torque m ain bearing cap bolts to specifications.
OIL SEAL (REAR M A I N )
R eplacem ent
N O T E : Always replace the upper and lower seal as
a unit. Install seal w ith lip facing front o f engine.
T h e r e a r m ain bearing oil seal can be replaced (both
halves) without removal o f the crankshaft. Extreme care
should be exercised when installing this seal to protect
the sealing bead located in the channel on the outside
d ia m e te r o f the seal. An installation tool (fig. 6A-62V)
can be used to protect the seal bead w hen positioning
seal as follows:
1. W ith the oil pan and oil p u m p removed, remove
the re a r m ain bearing cap.
2. Remove oil seal from the bearing cap by prying
from the bottom with a small screw driver (fig. 6A-63V).
3. To remove the upper half o f the seal, use a
Fig. 6A-64V~Removing Oil Seal • Upper H alf
small h a m m e r to tap a brass pin punch on one end o f
seal until it protrudes far enough to be removed with
pliers (fig. 6A-64V).
4. Clean all sealant and foreign m aterial from
cylinder case bearing cap and crankshaft, using a n o n ­
abrasive cleaner.
5. Inspect com ponents for nicks, scratches, burrs
and m achining defects at all sealing surfaces, case
assembly and crankshaft.
6. Coat seal lips an d seal bead with light engine oil
- keep oil off seal m atin g ends.
7. Position tip o f tool between cran k sh aft and seal
seat in cylinder case.
8. Position seal between cran k sh aft and tip o f tool
so that seal bead contacts tip o f tool.
N O T E : M ake sure that oil-seal lip is positioned
toward front o f engine (fig. 6A-65V).
9. Roll seal a round crankshaft using tool as a