Chevrolet Light Duty Truck 1973, Service Manual

Page: 567 / 979

E N G IN E ELECTRICAL 6 Y -39
Eight Cylinder Engine D istributor
1. Remove distributor cap, rotor and R.F.I. shield.
2. Disconnect condenser lead (fig. 14i) from terminal.
3. Remove screw holding condenser bracket to breaker
plate and slide condenser from bracket.
4. To replace condenser reverse the above procedure.
NOTE: Make sure that new condenser lead is
installed in proper position (fig. 14i).
Distributor
Removal
1. Release the distributor cap hold-down screws,
remove the cap and place it clear of the work area.
NOTE: If necessary, remove secondary leads
from the distributor cap after first marking
the cap tower for the lead to No. 1 cylinder.
This will aid in the reinstallation of leads in
the cap.
2. Disconnect the distributor primary lead from the
coil terminal.
3. Scribe a realignment mark on the distributor bowl
and engine in line with the rotor segment.
4. Disconnect vacuum line to distributor. Remove the
distributor holddown bolt and clamp and remove
the distributor from the engine. Note position of
vacuum advance mechanism relative to the engine.
CAUTION:
Avoid rotating the engine with the
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
distributor housing downward toward the gear to take up
any end play between the gear and the 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 (Fig. 2 0 i)
1. Remove the rotor on Van models, also remove 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
1. B re a k e r P la te A t t a c h in g
S cre w s
2 . C o n d e n s e r A t t a c h in g
S cre w s
3 . C o n d e n s e r
4 . B re a k e r P la te A s s e m b ly
4 a . C a m L u b r ic a to r
5 . V a c u u m C o n t r o l A s s e m b ly
6 . V a c u u m C o n t r o l
A t t a c h in g S cre w s
7 . H o u s in g
8 . C a p
9 . R o to r
10. C o n ta c t P o in t
A t t a c h in g S c re w
11. C o n ta c t P o in t A s s e m b ly
12. W e ig h t C o v e r
A t t a c h in g S cre w s
13. W e ig h t C o v e r
14. W e ig h t S p rin g s
15. A d v a n c e W e ig h ts
16. C a m A s s e m b ly
17. M a in S h a ft
A s s e m b ly
18. R o ll P in
1 9 . D r iv e G e a r
Fig. 2 0 i — L-6 D is tr ib u to r - E x p lo d e d V ie w
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.
NOTE: Do not disassemble breaker plate any
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.
LIGHT DUTY TRUCK SERVICE MANUAL