Chevrolet 30 Series 1967 Service Manual page 369

F ig . 5 i—C h eckin g Breaker Arm Spring Tension
within specified lim its. Weak tension will cause
chatter resulting in arcing and burning of the
points and an ignition m iss at high speed, while
excessive tension will cause undue wear of the
contact points, cam and rubbing block. Breaker
arm spring tension should be 19-23 ounces. The
contact point pressure should be checked with a
spring gauge. The scale should be hooked to the
breaker lever and the pull exerted at 90 degrees
to the breaker lever as shown in Figure 5i. The
reading should be taken just as the points sepa­
rate. The pressure can be adjusted by bending
the breaker lever spring. If the pressure is ex­
cessive, it can be decreased by pinching the
spring carefully. To increase pressure, the
lever must be removed from the distributor so
the spring can be bent away from the lever.
Avoid excessive spring distortion.
9. Set point opening (.019" for new points).
10. Reinstall rotor, position and lock distributor cap to
housing.
11. Start engine and test dwell and ignition timing.
Eight Cylinder Engine Distributor
1. The contact point set is replaced as one complete
assembly and only dwell angle requires adjustment
after replacement. Breaker lever spring tension and
point alignment are factory set.
2. Remove the distributor cap by placing a screw driver
in the slot head of the latch, press down and turn 1/4
turn in either direction.
3. Remove the two attaching screws which hold the base
of the contact set assembly in place.
4. Remove the primary and condenser leads from their
nylon insulated connection (fig.
5. Reverse Steps 2, 3 and 4 to install new contact set.
CAUTION: Install the primary and condenser
leads as shown in Figure
tion will cause lead interference between the
cap, weight base and breaker advance plate.
. If car has 20,000 to 25,000 miles (or sooner if
6
desired) the cam lubricator wick (fig. 7i) should be
changed. Using long nosed pliers squeeze assembly
i) in contact set.
6
i. Improper installa­
6
PRIM ARY
LEAD
Fig . 6 i—Distributor Lead Arrangements
together at base and lift out. Remove all old lubri­
cant from cam surface. Replace in same manner.
NOTE: End of cam lubricant wick should be
adjusted to just touch cam lobes. Over lubri­
cation of cam resulting in grease on contact
points can be caused by cam lubrication wick
bearing too hard against cam surface. A cor­
rectly adjusted cam lubricator wick will provide
LOCATOR
(R O U N D )
CENTRIFUGAL
ADVANCE
MECHANISM
CAM
LUBRICATOR
REPLACEMENT
ADJUST SQUARELY
AND JUST
TOUCHING LOBE
OF CAM
Fig . 7 i—Top V ie w of Distributor
ENGINE-ELECTRICAL 6Y-21
ROTOR
LOCATOR
(SQ U A R E )
CAM
LUBRICATOR
CAUTION!
NEVER OIL
CAM LUBRICATOR—
REPLACE WICK
WHEN NECESSARY
CHEVROLET TRUCK SERVICE M ANUAL