Pontiac FIREBIRD 1972 Service Manual page 799

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ENGINE ELECTRICAL
SHAFT AND
WEIGHT BASE
HOU
8. Pull shaft and weight base assembly and washer out
of distributor housing and remove screws and wash-
ers securing centrifugal advance upper plate.
CONTACT SET
WEIGHT HOLD
DOWN PLATE
WEIGHT SPRING
BREAKER CAM
GEAR
GEAR
PIN WEIGHTS
Fig. 6E-50 Exploded View of 6 Cyl. Distributor
5. Remove screws from vacuum advance diaphragm
bracket. With slight downward pressure to disengage
lever, remove vacuum advance assembly.
6. Remove screws securing breaker plate and remove
breaker plate.
9. Remove weight control springs, weights from base
plate and pull breaker cam assembly from main shaft.
ASSEMBLE
Assembly of the distributor is the reverse of the disassem-
bly procedure outlined above. Coat upper end of shaft
with grease before installing breaker cam. When installing
the gear on shaft, use a new roll pin. The pin must be tight
in hole to prevent any movement between gear and shaft.
INSTALL
I
1. Check to see that engine is at firing position for No.
1 cylinder (No. 1 piston at top of compression stroke)
and timing mark on harmonic balancer is indexed
with the 0 " mark on the timing chain cover (Fig.
6E-49).
2. Position new distributor to block gasket on block.
3. Before installing distributor, index rotor with hous-
ing as noted when distributor was removed, Fig. 6E-
44. This will simplify indexing the distributor shaft
and gear with oil pump drive shaft and distributor
drive gear. Distributor and rotor will be positioned
properly when installed with No. 1 piston in firing
position.
4. Replace distributor clamp leaving nut loose enough
to allow distributor to be turned for timing adjust-
ment.
5. Attach distributor to coil primary wire.
6. Adjust points as described under ADJUSTING
POINT OPENING.
7. Remove roll pin from driven gear and remove driven
gear and washer.
7. Replace distributor cap.
Fig. 6E-5 1 Rotor in No. 1 Firing Position
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6 Cylinder
8. Adjust timing and then tighten distributor clamp nut.
9. Attach vacuum hose to distributor.
DISTRIBUTOR 18 CYLINDER ENGINE
PERIODIC SERVICE
A permanent lubricant reservoir is built into the distribu-
tor housing to lubricate upper end of shaft. No periodic
lubrication is required.
When replacing contact set assembly, apply a trace of
petrolatum to breaker cam. No other lubrication is re-