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ELECTRICAL
DISTRIBUTOR (DELCO-REMY)
Model 1110887
(External Adjustment Type)
The external adjustment type distributor illustrated in Figure
1 is a 12 volt, 8 cylinder unit. The cap has a window for
adjusting dwell angle while the cap is in amounted position.
The circuit breaker plate is located below the centrifugal
advance mechanism and uses the outer diameter of the main
shaft bushing for its bearing surface. The movable plate is
held into position by a retainer clip in the upper shaft bushing.
The molded rotor serves as a cover for the centrifugal advance
mechanism. The vacuum control unit is mounted under the
movable breaker plate to the distributor housing. The contact
set is attached to the movable breaker plate. The service
replacement contact set has the BREAKER LEVER SPRING
TENSION AND POINT ALIGNMENT prefactory adjusted
and is serviced as one complete assembly. Only the point
opening ( dwell angle I requires adjusting after replacement.
FIGURE 1—Distributor Assembly
Under part throttle operation, the intake manifold vacuum is
sufficient to actuate the vacuum control diaphragm and cause
the movable plate to move, thus advancing the spark and
increasing fuel economy. During acceleration or when the
engine is pulling heavy, the vacuum is not sufficient to actu-
ate the diaphragm and the movable plate is held in the re-
tarded position by a calibrated return spring which bears
against the vacuum diaphragm.
The centrifugal advance mechanism consists of an auto-
matic cam actuated by two centrifugal weights controlled by
springs. As the speed of the distributor shaft increases with
engine speed, the weights are thrown outward against the pull
of the springs. This advances the cam causing the contact
points to open earlier and thus advancing the spark.
Lubrication
The hinge cap oiler should be filled with SAE 20 oil at each
vehicle lubrication period. When replacing the contact set
assembly, add a trace of Ball Bearing Lubricant to the breaker
cam. No other lubrication is required. The movable breaker
plate is lubricated by oil from the upper shaft bushing. In
addition to lubrication, the distributor requires periodic in-
spection of the cap and rotor, wiring, breaker points, and
timing.
Adjustment of Dwell Angle on the Car
With the engine running at idle, the dwell is adjusted by first
raising the window provided in the cap and inserting a "Hex"
type wrench into the head of the adjusting screw as shown in
Figure 2.
Figure 2—Adjusting Point Spacing (Dwell)
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