Chevrolet 10 Series 1967, Service Manual

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ENGINE 6-18
EXCEPT GS 10-20-30 SERIES
a. ON CS 10-20-30:
• 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.
• Lower engine, install front mount bolts and
torque to specifications.
b. Install starter and connect battery cable.
GS 10-20 SERIES
a. I n s t a l l t h e crossmember and torque to
specifications.
b. Lower the engine to rest on the front mounts then
remove the jack stand and Tool J - 6978-1.
c. Install the front mount b o l t s and torque to
specifications.
d. Install the shroud and connect lower radiator
hose.
e. Install the accessory drive pulley (if so equipped).
f. On vehicles equipped with automatic transm is­
sion install the cooler lines.
g. Install the starter and engine splash shields.
h. Install the fan and pulley as outlined in Section
6
K.
i . Connect the battery cable.
7. Fill with coolant and 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.
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.
Oil Seal (Rear Main)
Replacement
The rear main bearing oil seal can be replaced (both
halves) without removal of the crankshaft.
NOTE:
Always replace the upper and lower
seal as a unit. Install with the lip facing toward
the front of the engine.
1. With the oil pan removed, remove the rear main
bearing cap.
2. Remove oil seal from the groove by lifting the end
tab (fig. 7L) then clean seal groove.
3. Lubricate the lip and O.D. of a new seal with engine
oil. Keep oil off the parting line surface. Insert seal
in cap and roll it into place with finger and thumb,
using light pressure so beads on seal O.D. are not
cut by seal groove at cap parting line. Be sure tabs
on seal are properly located in cross grooves.
4. 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.
8
L).
NOTE: Always wipe crankshaft surface clean
before installing a new seal. Also clean seal
groove.
5. Lubricate the lip and O.D. of a new seal with engine
oil. Keep oil off the parting line surface. Gradually
push with a hammer handle, while turning crank­
shaft, until seal is rolled into place. (Similar to
installing a main bearing). Be careful that seal bead
on O.D. is not cut. Compress seal towards crank­
shaft as much as possible.
6
. Install the rear main bearing cap (with new seal) and
torque to specifications. Be sure cross seal tabs
are in place and properly seated.
Torsional Damper
Removal
1. Drain radiator and disconnect radiator hoses at
radiator.
2. Remove radiator core, as outlined in Section 13.
3. Remove fan belt and (if so equipped) accessory drive
pulley and belt. If so equipped, remove retaining
bolt.
4. Install Tool J-6978 to damper and turn puller screw
to remove damper (fig. 9L). Remove tool from
damper.
Fig . 7 L—Removing O il Seal (Lower H alf)
CHEVROLET TRUCK SERVICE M ANUAL