Oil Pump; Oil Pan; Oil Seal (Rear Main) - Chevrolet 10 1971 Series Chassis Service Manual

Installation
The gasket surfaces on both the
CAUTION:
head and the block must be clean of any foreign
matter and free of nicks or heavy scratches.
Cylinder bolt threads in the block and threads on
the cylinder head bolt must be cleaned, (Dirt
will affect bolt torque). Do Not use gasket sealer
on composition steel asbestos gaskets.
1. Place the gasket in position over the dowel pins with
the bead up.
2. Carefully guide cylinder head into place over dowel
pins and gasket.
3. Coat threads of cylinder head bolts with sealing
compound and install finger tight.
4. Tighten cylinder head bolts a little at a time in the
sequence shown on the torque sequence chart until
the specified torque is reached.
5. Install coil.
6. Connect radiator upper hose and engine ground strap.
7. Connect temperature sending unit wires and install
fuel and vacuum lines in clip at water outlet.
8. Fill cooling system.
9. Install manifold assembly as outlined.
10. Install and adjust valve mechanism as outlined.
11. Install and torque rocker arm cover.

Oil Pan

Removal
1. Disconnect battery ground cable then remove starter.
2. On CS 10-20-30.
a. Remove engine front mount bolts (frame bracket-
to- mount).
b. Using a suitable jack with a flat piece of wood
(to prevent damaging oil pan), raise engine enough
to insert 2" x 4" wood blocks between the engine
mounts and frame brackets.
3. Drain engine oil.
4. Remove oil pan and discard gaskets and seals.
Installation
1. Thoroughly clean all gasket sealing surfaces.
2. Install new rear seal in rear main bearing cap.
Fig. 5 L — Removing O il Seal (Lower Half) Typical
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. 3L).
: DO NOT USE SEALER,
NOTE
5. Install oil pan and torque bolts to specifications.
6. Complete installation as follows on CS 10-20-30:
a. Using a suitable jack with a flat piece of wood
(to prevent damaging oil pan), raise engine
enough to remove 2" x 4" wood blocks from
between the engine mounts and frame brackets,,
b. Lower engine, install front mount bolts and torque
to specifications.
c. Install starter and connect battery cable.
7. Fill with engine 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.
Oil pump should slide easily into place,
NOTE:
if not, remove and reposition slot to align with
distributor tang.
2. Install oil pan as outlined.

Oil Seal (Rear Main)

Replacement
Always replace the upper and lower seal
NOTE:
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
Fig. 6 L — Removing O il Seal (Upper Half) Typical
ENGINE 6-19
10-30 CHEVROLET TRUCK SERVICE MANUAL