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10-72
IGNITION SYSTEM
ELECTRICAL SYSTEMS
(348)
3. On 1948 Model distributor place a small
amount of petroleum jelly in ball bearing seats
in breaker plate, hold breaker plate in position
with seats for ball bearings aligned with verti-
cal grooves in housing, and spring type seat
adjacent to slot for vacuum control link.
Place the three ball bearings in grooves and
seats, push breaker plate down as far as it will
go and rotate it counterclockwise a short dis-
tance. See figure 10-88.
3a. On 1949 Model distributor, place breaker
plate assembly in housing and attach it with
three screws and lock washers. Two of these
screws also attach the cap retainer springs
and supports, and one screw also attaches the
breaker plate ground lead.
4. Install vacuum control and attach ground
lead. Vacuum control must be installed so that
the link does not exert an upward or down-
ward thrust on breaker plate when the con-
trol operates.
5. Install terminal stud and bushing, and
attach connector lead to stud. See figure 10-84.
6. Install wick in distributor cam if this
was removed, and apply a few drops of light
engine oil to wick. Apply one drop of oil to
breaker arm pivot.
7. Work a small amount of petroleum jelly
into a piece of clean cloth, then hold cloth
against distributor cam while turning distribu-
tor shaft. CAUTION: An excessive amount of
lubricant on cam may throio off when hot and
get between contact points, thereby insulating
the points and causing ignition failure.
8. Adjust contact point opening to not less
than .0125" or more than .0175" (par. 10-45).
9. If a reliable distributor tester is avail-
able, test the distributor to make certain that
the centrifugal and vacuum advance mechan-
isms are operating according to the following
specifications:
Rotation
Counterclockwise
Contact Point Opening .
.
.. .0125" to .0175"
Breaker Arm Spring Tension ... 19 to 23 oz.
Vacuum Advance-Distributor Degrees and
Vacuum
Start travel at 5" to 7" (Hg.) of Vacuum
5 to 6 Deg. at 10" to 13" (Hg.) of Vacuum
Centrifugal
Advance-Distributor
Degrees
and RPM
0-2 Deg. at 250 RPM*
5-7 Deg. at 400 RPM*
11-13 Deg. at 1500 RPM*
*
lf2
Engine RPM
4
I
-
3
REAR OF
ENGINE
CORK Oil
SEAL
O
il
PUMP
SHAFT
Figure 10-89-Position of Distributor for Installation
f.
Installation
of Distributor
1.
Check to make sure that timing mark
on flywheel is aligned with index mark on fly-
wheel housing, with No. 1 piston on compres-
sion stroke.
2. Place a new cork oil seal on distributor
housing.
3. Rotate distributor cam in direction of
arrow on cam until rotor is nearly in position
to fire No.1 cylinder, and contact
points have
just closed from the pr
eceding
cam lobe which
fires No.4 cylinder. This position is necessary
to allow for the amount that cam will rotate as
the driving gears are meshed.
4. Rotate oil pump shaft with screw driver
to align slot in shaft with tongue on lower end
of distributor shaft. Install distributor in
crankcase with vacuum control pointing to
rear of
engine
and approximately parallel to
side of crankcase. See figure
10-89.
5.
Install
attaching bolts with flat washers
and lock washers
leaving bolts just loose
enough so that distributor housing can be
turned. Rotate distributor housing until con-
tact points just start to open, then tighten at-
taching bolts. This will permit starting engine
for setting the timing.
6. Connect pipe to vacuum control and con-
nect primary
wire
to terminal stud.
7. Install distributor cap. If ignition cables
are disconnected from cap make certain that
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