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6A5-12
1 9 7 7 PONTIAC SERVICE MANUAL
Assemble
I. Starting with the end cylinder, place the exhaust valve
in the port and place the valve spring and cap in position.
Then using suitable spring compressor, compress the spring
and install new oil seal and valve locks. See that the seal is
flat and not twisted in the valve stem groove and that the seat
locks properly in the valve stem groove (Fig. 6A5-13).
2. Assemble the remaining valves, valve springs, shields,
spring caps, new oil seals and valve locks in the cylinder head.
Check seals by placing a vacuum cup over valve stem and cap
(Fig. 6A5-14).
3. Install cylinder head as previously described.
HARMONIC BALANCER OR
PULLEY HUB
Remove and Replace
NOTE: Some engines will have a pulley hub rather than
a balancer. In either case procedures for removal are the
same.
1. Remove all drive belts.
2. Position fan so wide angles will be at top and bottom
allowing access to balancer (Fig. 6A5-25).
I
Fig. 6A5-25 Balancer and Pulley - Typical
3. Remove harmonic balancer attaching bolt and
retainer washer.
4.Remove harmonic balancer by sliding it off end of
crankshaft.
5. Remove crank pulleys and reinforcing plate.
C AUTI 0 N: Do not pry on
0.
D. of harmonic
balancer. The harmonic balancer is a rubber
mounted inertia member and balance could be
affected.
6. Install new harmonic balancer by reversing above
steps, lining up keyway in balancer with key on crankshaft.
7. Tighten harmonic balancer attaching bolt to 160 Ib.
ft. (Remove flywheel cover and lock flywheel before
tightening balancer bolt).
8. Install drive belts and adjust to specifications.
TIMING
CHAIN COVER SEAL
Remove and Replace
I. Remove fan and accessory drive belts.
2. Remove harmonic balancer.
3. Remove timing chain cover seal by prying out of bore
with a pry bar (Fig. 6A5-26).
Fig. 6A5-26 Timing Chain Cover Seal
4. Install new seal with helical lip of seal inward, using
seal installer 5-21 147.
5. Install harmonic balancer.
6. Install fan and drive belts and adjust to proper tension
(see Section 6B).
TIMING CHAIN COVER,
GASKET OR FUEL PUMP
ECCENTRIC
Remove and Replace
1. Drain radiator and cylinder block.
2. Remove fan belt and accessory drive belts.
3. Remove fan and pulley from hub of water pump.
4. Disconnect lower radiator hose.
5. Remove fuel pump.
6. Remove harmonic balancer.
7. Remove front four oil pan-to-timing chain cover
screws.
8. Remove timing chain cover to block attaching bolts
and nuts and timing chain cover to intake manifold bolt.
9.Pull timing chain cover forward to clear studs and
remove.
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