Eight Cylinder Engine Distributor; Top View Of Distrbutor; Distributor Lead Arrangem Ent - Chevrolet 10 1971 Series Chassis Service Manual

arm rubbing block is on the high point of the cam
lobe. This will provide maximum point opening.
3. Loosen the contact support lock screw.
4. Use a screw driver (fig. 7i) to move the point support
to obtain a .019" opening for new points and a .016"
opening for used points.
5. Tighten the contact support lock screw and recheck
the point opening.
6. After checking and adjusting the contact point open­
ing to specifications, the cam angle or dwell should
be checked with a dwell angle meter if such equip­
ment is available (see Specifications for proper dwell
angle). If the cam angle is less than the specified
minimum, check for defective or misaligned contact
points or worn distributor cam lobes. The variation
in cam angle readings between idle speed and 1750
engine rpm should not exceed 3°. Excessive variation
in this speed range indicates wear in the distributor.
Cam angle readings taken atspeeds above
NOTE:
1750 engine rpm may prove unreliable on some
cam angle meters.

Eight Cylinder Engine Distributor

On the Vehicle
With the engine running at idle and operating tempera­
tures normalized, the dwell is adjusted by first raising
the window provided in the cap and inserting a "Hex type
wrench into the adjusting screw head (fig. 8i).
1. Preferred Method - Turn the adjusting screw until
the specified dwell andle is obtained as measured in
degrees (29° to 31°, 30° preferred) by a dwell angle
meter.
2. Alternate Method - Turn adjusting screw in (clock­
wise) until the engine begins to misfire, then turn
screw 1/2 turn in the opposite direction (counter­
clockwise). This will give the approximate dwell
angle required. (Use only when meter is not avail­
able).
Off the Vehicle
1. Distributor Test Method:
a. With the distributor mounted on a distributor test­
ing machine, connect the dwell meter to the dis­
tributor primary lead.
PRIM ARY
LEA D
Fig. 3i-D istrib u tor Lead Arrangem ent
( R O U N D )
CENTRIFUGAL
A D V A N C E
M E C H A N IS M
C A M
LUBRICATOR
REPLACEMENT
ADJUST SQUARELY
A N D JUST
T O U C H IN G LOBE
OF C A M
Fig. 4i-Top View of Distrbutor
b. Turn the adjusting screw (fig. 8i) to set the dwell
angle to 30 degrees.
2. Test Light Method:
a. With the distributor mounted in a vise, connect a
testing lamp to the primary lead.
Fig. 5i-Inaccu rate G au ge of Rough Points
ENGINE-ELECTRICAL 6Y-17
ROTOR
LOCATOR
( S Q U A R E )
C A M
LUBRICATOR
C A U T IO N !
NEVER OIL
C A M LUBRICATO R —
REPLACE W IC K
W H E N N ECESSAR Y
10-30 CHEVROLET TRUCK SERVICE MANUAL