Camshaft And/Or Camshaft Bearing - Pontiac tempest 1968 Service Manual

6-56 1968 P O N T I A C SERVICE MANUAL
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Install fuel pump eccentric and bushing, Index­
ing tab on eccentric with keyway cut-out in sprocket.
Install retainer bolt with retainer washer and tighten
securely.
7. Making certain hollow dowels are In place in
block, place timing chain cover gasket over studs
and dowels.
8. Install timing chain cover, making sure O-ring
seal is in place.
CAMSHAFT AND/OR CAMSHAFT BEARING-
REMOVE AND REPLACE
The camshaft and camshaft bearings can be r e ­
placed with engine installed in car or with engine
removed and disassembled for overhaul; however,
to replace the rear camshaft bearing without r e ­
moving and completely disassembling engine, the
propeller shaft, transmission and clutch housing
must first be removed.
To replace the camshaft and/or the rear center,
center, front center or front camshaft bearing with­
out removing and completely disassembling the en­
gine, proceed as follows:
1. Drain radiator.
2. Remove carburetor air cleaner.
3. Disconnect all water hoses, vacuum hose and
spark plug wires.
4. Disconnect carburetor linkage, fuel lines and
wires to thermogauge unit.
5. Remove hood latch brace.
6. On air-conditioned cars, remove generator
mounting bracket and generator.
7. Remove crankcase ventilator hose, and remove
both rocker arm covers and gaskets.
8. Remove distributor hold-down clamp and r e ­
move distributor.
9. Remove intake manifold and gaskets.
NOTE: Make certain O-ring seal between intake
manifold and timing chain cover is retained and
installed during assembly.
10. Remove push rod cover.
11. Loosen rocker arm ball retaining nuts so that
rocker arms can be disengaged from push rods and
turned sideways.
12. Remove push rods and hydraulic lifters. Store
push rods in stand and lifters in a lifter box so they
can be reinstalled in original positions.
13. Remove harmonic balancer.
14. Remove fuel pump.
15. Remove four oil-pan-to-timing-chain-cover
screws.
16. Remove timing chain cover and gasket.
17. Remove fuel pump eccentric and fuel pump
bushing.
18. Align timing marks on timing chain sprockets
and remove timing chain and sprockets.
19. Remove camshaft thrust plate.
20. Carefully pull camshaft from engine, exer­
cising caution so as not to damage bearings in
block.
NOTE: The clearance for camshaft removal is
very limited and, in cases where engine mounts
are worn excessively, it may be necessary to raise
the front of the engine to permit removal.
21. Stuff clean rags through openings in engine
block as an aid in preventing foreign material or
parts of bearing remover tool from dropping into
block.
CA UTION: It is imperative that operator exercise
extreme caution when inserting bearing remover
adapters or key through openings in engine block
to prevent them from dropping into engine.
CAMSHAFT B E A R I N G - R E MOVE
1. Insert remover adapter J 6173-4 into front
bearing to act as a support for shaft J 6173-1 (Fig.
6-97).
NOTE: If front bearing is to be replaced, insert
installer adapter in center bearing to act as sup­
port for shaft.
F i g . 6 - 9 7 Positioning Index Collar