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Page Title: Figure 3-8. Distributor Cutaway
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TM 10-3930-633-34
stationary sub plate assembly and has centrifugal
respect to the distributor drive shaft. The rate of
weights that move inward or outward with
advance is controlled by calibrated weight
changes in engine speed. As engine speed in-
springs.
creases, the centrifugal weights move ahead with
.
Figure 3-8. Distributor Cutaway
b. Vacuum Advance. The vacuum single
3-8. Distributor Repair
advance has a spring loaded diaphragm connected
a. Removal. See TM 10-3930-633-12 for
to the breaker plate assembly, The diaphragm is
distributor removal procedures.
moved against the spring pressure by vacuum
b. Disassembly. Refer to figure 3-9 for parts
pressures. When the vacuum increases, the
identification, and proceed as follows:
diaphragm causes the movable breaker plate to
(1) Unsnap clamps (7) and remove cap (1)
pivot on the stationary sub-plate. The breaker
and rotor (2).
point rubbing block, which is positioned on the
(2) Disconnect the primary wire (22) and the
opposite side of the cam from the pivot pin, then
condenser wires from the contact point assembly
moves opposite to distributor rotation and ad-
(18).
vances the spark timing. As the movable breaker
(3) Remove the contact point assembly
plate is rotated from retard position to full-
retaining screws (19 and 20) and the condenser or
advance position, the breaker point dwell will
ground wire retaining screw. Lift the breaker
remain constant due to the breaker point rubbing
point assembly and condenser (if so equipped) out
block and the cam rotating on the same axes of
of the distributor.
the breaker plate and sub-plate.
(4) Remove the spring clip that secures the
diaphragm link to the movable breaker plate.

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