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6A3-8
1977 PONTIAC SERVICE MANUAL
7. Remove distributor. If timing chain and sprockets are
not going to be disturbed, note position of distributor rotor
for reinstallation in same position.
8. Loosen and slide front clamp on thermostat by-pass
hose rearward.
9. Remove harmonic balancer bolt and washer and
remove harmonic balancer.
10. Remove bolts attaching timing chain cover to
cylinder block. See Fig. 6A3-16. Remove two oil pan to
timing chain cover bolts Remove timing chain cover assembly
and gasket. Thoroughly clean the cover, taking care to avoid
damage to the gasket surface.
Fig.
6 A 3 - 1 7
Locking Flywheel to Torque Harmonic
FRONT CRANKSHAFT OIL SEAL
REPLACEMENT
1. Use a punch to drive out old seal and shedder. Drive
from the front toward the rear of the timing chain cover.
2. Coil new packing around opening so ends of packing
are at top. Drive in shedder using suitable punch. Stake the
shedder in place in at least three places.
3. Size the packing by rotating a hammer handle or
similar tool around the packing until the balancer hub can
be inserted through the opening.
TIMING CHAIN AND SPROCKET
ig.
6 A 3 - 1 6
Timing Chain Cover Removal and lnstallation-
Removal
Installation
Reinstall timing chain cover by reversing removal
procedure, paying particular attention to the following
points.
1. Remove oil pump cover and pack the space around
the oil pump gears completely full of petroleum jelly. There
must be no air space left inside the pump. Reinstall cover
using new gasket. This step is very important as the oil pump
may "lose its primeVwhenever the pump, pump cover or
timing chain cover is disturbed. If the pump is not packed,
it may not begin to pump oil as soon as the engine is started.
2. The gasket surface of the block and timing chain cover
must be smooth and clean. Use a new gasket and be certain
it is positioned correctly.
3. Position timing chain cover against block and be
certain dowel pins engage dowel pin holes before starting
bolts.
4. Apply sealer to bolt threads as shown in Fig. 6A3-16.
5. Install harmonic balancer, bolt and washer. By using
a screwdriver or other suitable tool, lock flywheel and torque
bolt to specification. See Fig. 6A3-17.
1. With timing chain cover removed temporarily install
harmonic balancer bolt and washer in end of crankshaft.
Turn crankshaft so sprockets are positioned as shown in Fig.
6A3-18. Remove harmonic balancer bolt and washer using
a sharp blow on the wrench handle, so that the bolt can be
started out without changing position of sprockets.
2. Remove front crankshaft oil slinger.
3. Remove camshaft sprocket bolts.
4. Use two large screwdrivers to alternately pry the
camshaft sprocket then the crankshaft sprocket forward until
the camshaft sprocket is free, then remove the camshaft
sprocket and chain and finish working crankshaft sprocket
off crankshaft.
5. Thoroughly clean the timing chain, sprockets,
distributor drive gear, fuel pump eccentric and crankshaft oil
slinger.
Installation
1. Turn crankshaft so that Number 1 piston is at top
dead center.
2. Turn camshaft so with sprocket temporarily installed,
timing mark is straight down. See Fig. 6A3-18. Remove
Sprocket.
3. Assemble timing chain on sprockets and slide the
sprocket and chain assembly on the shafts with the timing
marks in their closest together position and in line with the
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