Chevrolet 10 1971 Series Chassis Service Manual page 269

Fig. 9 i—L—6 Distributor Exploded View
1. , Breaker Plate Attaching
Screws
2. Condenser Attaching Screws 11. Contact Point Assembly
3. Condenser
4. Breaker Plate Assembly
4o. Cam Lubricator
5. Vacuum Control Assembly
6. Vacuum Control
Attaching Screws
7. Housing
8. Cap
9. Rotor
Scribe a realignment mark on the distrbutor bowl
3.
and engine in line with the rotor segment.
10. Contact Point Attaching
Screw
12. Weight Cover Attaching
Screws
13. Weight Cover
14. Weight Springs
15. Advance Weights
16. Cam Assembly
17. Main Shaft Assembly
18. Roll Pin
19. Drive Gear
4. Disconnect external connections (vacuum line, drive
cables, etc.) remove the distributor hold-down bolt
and clamp, remove the distributor from the engine.
Note position of vacuum advance mechanism relative
to the engine.
Avoid rotating the engine with the
CAUTION:
distributor removed as the ignition timing will
be upset.
Disassembly
It is advisable to place the distributor in a distributor
testing machine or synchroscope prior to disassembly.
When mounting distributors for tests, first secure the
gear in the test drive mechanism, then push the distribu­
tor housing downward toward the gear to take up any end
play between the gear and the housing.
When testing distributors that have their
NOTE:
lower shaft support bushing located in the engine
block (6 cylinder engines) a special adapter
should be used to insure the shaft will run true
in its housing.
Test the 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. Check the area on the breaker plate just
beneath the contact points. A smudgy line indicates that
oil or crankcase vapors have been present between the
points.
Six Cylinder Engines
Refer to Figure 9i.
1. Remove the rotor and dust shield.
2. Remove the vacuum control assembly retaining
screws, detach the unit from the distributor housing.
3. Disconnect the primary and condenser leads from
the contact point quick disconnect terminal, remove
the contact point set attaching screw, condenser
attaching screw. Remove the point set and condenser
from the breaker plate.
4. Remove the breaker plate attaching screws, remove
the breaker plate from the distributor housing (fig.
9i).
Do not disassembly breaker plate any
NOTE:
further.
5. Remove the roll pin retaining the driven gear to the
mainshaft, slide the gear from the shaft.
6. Slide the cam and mainshaft from the distributor
housing.
7. Remove the weight cover and stop plate screws, re­
move the cover, weight springs, weights and slide
cam assembly from the mainshaft.
V-8 Engines
Refer to Figure lOi.
1. Remove the rotor.
2. Remove both weight springs and advance weights.
3. Remove roll pin retaining driven gear to the distri­
butor shaft, slide the gear and spacers from the
shaft. On heavy duty models remove shock mounting
unit.
4. Before sliding the distributor shaft from the housing,
check for and remove any burrs on the shaft. This
will prevent damage to the seals and bushing still
positioned in the housing.
5. Slide the distributor mainshaft and cam-weight base
assembly from the housing.
ENGINE-ELECTRICAL 6Y-19
10-30 CHEVROLET TRUCK SERVICE MANUAL