Chevrolet Light Duty Truck 1973, Service Manual

Page: 390 / 979

6 - 5 4 E N G IN E
rear seal in rear main bearing cap groove, with
ends butting side gaskets. Install new oil pan front
seal in groove in crankcase front cover with ends
butting side gaskets (fig. 10V).
3. Install oil pan and torque bolts to specifications.
4. Install starter brace and attaching bolts. Torque
bolts to specifications.
5. Install converter housing under pan (if removed).
6. Install exhaust crossover pipe (if removed).
7. Install oil dip stick tube and dip stick.
8. Fill with oil, start engine and check for leaks.
Oil Pump
Removal
1. Remove oil pan as outlined.
2. Remove pump to rear main bearing cap bolt and
remove pump and extension shaft.
Installation
1. Assemble pump and extension shaft to rear main
bearing cap, aligning slot on top end of extension
shaft with drive tang on lower end of distributor
drive shaft.
2. Install pump to rear bearing cap bolt and torque to
specifications.
NOTE: Installed position of oil pump screen
is with bottom edge parallel to oil pan rails.
3. Install oil pan as outlined.
Oil Seal (Rear Main)
Replacement
NOTE: Always replace the upper and lower
seal as 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. 1IV) can
be used to protect the seal bead when positioning seal as
follows:
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 screw driver (fig.
12V).
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. 13V).
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.
Fig. 12V—Removing Oil Seal (Lower Half)
Fig. 1IV—Oil Seal Installation Tool
Fig. 13V—Removing Oil Seal (Upper Half)
LIGHT DUTY TRUCK SERVICE MANUAL