Replace Contact Set; Arrangement Of Leads - Pontiac Grand Prix Service Manual

ENGINE ELECTRICAL
6E-17
fiom disiributor shafr will not run out onto breaker plate
and points.
INSPECT
With distributor removed from vehicle it is advisable
to place distributor in a distributor testing machine or
synchroscope. When mounting distributor in tester,
first
secure gear in drive mechanism, then push
distributor housing down toward gear to take up end
play between gear and housing, and finally secure
housing in tester. Test distributor for variation of
spark, correct centrifugal and vacuum advance, and
condition of contacts. This test will give valuable
information on distributor condition and indicate parts
replacement which may be necessary.
GROUND LEAD
Fig. 6E-29 Arrangement of Leads
The contact point set is replaced as one complete
assembly. The breaker lever spring tension and point
alignment of service contact set have been pre-ad-
justed at factory. Only point opening requires adjus-
ting after replacement.
Replace contact set as follows:
1. Remove two attaching screws which hold base of
contact set assembly in place.
2. Remove condenser lead and primary lead from
nylon insulated connection (Fig. 6E-29) in contact set.
3. Replacement is reverse of removal.
CA UTION: Make sure condenser lead and primary lead
are located as in Fig. 6E-29. Leads must be properly
located to eliminate interference between l e d and cap,
weight base or breaker plate.
4. Apply trace of petrolatum to breaker cam.
DISASSEMBLY AND ASSEMBLY
DISASSEMBLE (Fig. 6E-30)
1. Remove rotor by removing two attaching screws,
lockwashers, and flatwashers (Fig. 6E-30).
NOTE: It will be observed that rotor is doweled to
weight base so that it can be installed in only one
position.
2. Remove both weight springs and both advance
weights.
3. Remove retaining pin from gear by driving it out of
gear with a drift and hammer.
CAUTION: Distributor should be supported in such a
way that distributor shaft will not be damaged when
driving pin out.
4. Slide gear and washer off shaft.
-
5. Pull shaft and cam-weight base assembly from the
housing.
6. Remove contact set assembly.
7. Remove condenser hold-down screw, condenser and
bracket from the breaker plate.
8. Remove spring retainer and raise plate from
housing.
9. Remove two attaching screws and lock washers and
plate ground lead, and remove vacuum advance unit.
10. Remove felt washer from around bushing in
housing.
NOTE: No attempt should be made to service shaj
bushings in housing, as housing and bushings are
serviced as a complete assembly.
ASSEMBLE
Assembly of the distributor is reverse of disassembly
procedure outlined above. When installing gear on
shaft, use a new retaining pin. The pin must be tight in
hole to prevent any movement between gear and shaft.
Note that rotor can be installed in only one position. It
will be broken if an ,attempt is made to install it
backwards.
NOTE: Some GTO, Firebird and 428 HO distributors
will have cadmium plated, hardened drive gears.
Whenever one of these distributors or gears is replace4
an identical replacement part must be used. Engines