1928 Cadillac - GM Heritage Center

94 CADILLAC OPERATOR'S MANUAL
(Fig. 47a.) Tighten the nut securely,
taking care not to move the lamp out
of adjustment.
No adjustment for the lower beam is
necessary. If the lamp has been correctly
focused and aimed with the upper
beam on, the lower beam will appear
as in Fig 47b.
If it is desired to focus the lamp
with the door removed, this can be
done. Fig. 47c shows the upper beam
as it should appear with the lens removed.
figure 48. Headlamp adjusting screw.
CHAPTER V
Clutch and Transmission
Clutch
The Cadillac clutch is a disc clutch of exclusive design. There are three
driving plates, the center plate being bolted to the flywheel. The front
and rear driving plates float or slide on pins carried by the center plate.
There are two driven discs, one between the center and rear driving plates
and the other between the center and front driving plates. Both discs are
bolted to a central hub which slides on the splined end of the clutch shaft. The
discs are wheel shaped, lined on both sides with a ring of friction material.
When the clutch is engaged, the plates and discs are pressed firmly together
under the pressure of twelve 70-lb. springs. The driven discs then
revolve with the flywheel, and the engine, if running, drives the transmission.
When the clutch pedal is pushed down to disengage the clutch, a series
of levers releases the pressure of the springs and the driven discs separate
from the driving plates, permitting the flywheel to revolve independently
of the transmission.
The clutch itself requires no adjustment or attention other than lubrication
of the clutch thrust bearing, as directed on page 57. Adjustment of the
clutch release rod, however, may be necessary after the car has been driven
some distance.
Adjustment of Clutch Release Rod
As described on page 16, the clutch pedal is purposely given about one
inch of "lost motion." That is, the clutch does not begin to disengage until
the pedal has been moved down about an inch from its released position.
This lost motion is necessary in order
to allow the clutch discs to come
closer together as the facings are
reduced in thickness. The lost
motion gradually decreases as the
clutch is used, and eventually will
be taken up. Before this happens,
the clutch release rod must be readjusted
to restore the lost motion;
otherwise the clutch discs will slip
and the engine will not drive the car.
To make the adjustment, unscrew
the nut (Fig. 49) on the end of the
r .„ T, , • , , rod until the clutch pedal has a
Figure 49. The clutch control must be . .
adjusted so as to give the clutch pedal proper movement of one inch without
P •'
starting to disengage the clutch.
The nut must be turned a half-turn at a time.
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