Oil Pump; Removal; Installation; Oil Seal (Rear Main) - Chevrolet Light Duty Truck 1973 Service Manual

Fig. 8L—Engine Blocked for Oil Pan Removal
3. Install new front seal on crankcase front cover
pressing, tips into holes provided in cover.
4. Install new side gaskets on cylinder block (fig. 9L).
NOTE: DO NOT USE SEALER.
5. Position oil pan to block, making sure that seals
and gaskets remain in place, install and torque pan
screws to specifications.
. On G Series vehicles, raise engine as outlined above
6
and remove blocks used to support engine.
7. On G Series vehicles, lower engine, install and
torque mount-to-crossmember bracket bolts.
. Install starter and flywheel (convertor) cover.
8
9. Fill engine with specified quantity of oil, then start
engine and check for leaks.

Oil Pump

Removal

1. Remove oil pan as outlined.
2. Remove two flange mounting bolts, pickup pipe
bolt, then remove pump and screen as an assembly.

Installation

1. Align oil pump drive shafts to match with
distributor tang, then install oil pump to block
positioning flange over distributor lower bushing.
Use no gasket.
NOTE: Oil pump should slide easily into
place, if not, remove and reposition slot to
align with distributor tang.
2. Install oil pan as outlined.
Fig. 9L—Oil Pan Gasket and Seal Location

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. 10L) 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.
1 1 L).
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. 12L).
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.
EN GINE 6-29
LIGHT DUTY TRUCK SERVICE MANUAL