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ENGINE-ELECTRICAL 6Y-20
cause oxidized contact points. Check for these conditions
where burned contacts are experienced. An out-of-
balance condition in the ignition system, often the result
of too much or too little condenser capacity, is indicated
where point pitting is encountered.
REPLACEMENT
Four and Six Cylinder Engine Distributor
1. Release distributor cap hold-down screws, remove
cap and place it out of work area.
2. Remove rotor.
3. Pull primary and condenser lead wires from contact
point quick disconnect terminal (fig. 4i).
4. Remove contact set attaching screw, lift contact point
set from breaker plate.
5. Clean breaker plate of oil smudge and dirt.
6. Place new contact point assembly in position on
breaker plate, install attaching screw.
CAUTION: Carefully wipe protective film from
point set prior to installation.
NOTE: Pilot on contact set must engage match-
ing hole in breaker plate.
7. Connect primary and condenser lead wires to quick
disconnect terminal on contact point set. .
8. Check and adjust points for proper alignment and
breaker arm spring tension (fig. 5i). Use an aligning
tool to bend stationary contact support if points need
alignment.
NOTE: The contact point pressure must fall
within specified limits. Weak tension will cause
CONTACT SET
ATTACHING
SCREW
QUICK
DISCONNECT
TERMINAL
BREAKER PLATE
ATTACHING SCREWS
chatter, resulting in arcing and burning of-the
points and an ignition miss 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. $tart 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. 6i) in contact set.
5. Reverse Steps 2, 3 and 4 to install new contact set.
CAUTION:. Install the primary and condenser
leads as shown in Figure 6i. Improper installa-
tion will cause lead interference between the
cap, weight base and breaker advance plate.
6. If car has 20,000 to 25^000 miles (or sooner if
desired) the cam lubricator wick (fig. 7i) should be
changed. Using long nosed pliers squeeze assembly
together at base and lift out. Remove all old lubri-
cant from cam surface. Replace in same manner.
Fig. 4i—Breaker Plate and Attaching Parts
Fig. 5i—-Checking Breaker Arm Spring Tension
CHEVROLET CHASSIS SERVICE MANUAL
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