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4-4
CLUTCH
CLUTCH, TRANSMISSION,. UNIVERSAL JOINT
(132)
out slippage. The power drive is from flywheel
to clutch cover, cover to clutch spring, spring
to pressure plate, and from pressure plate and
flywheel to driven
plate.
See figure 4-1.
When the clutch is disengaged, the clutch
release bearing presses forward against the
high inner edge of clutch spring, which flattens
the spring. The curved inner ends of the spring
retainers act as fulcrum points which cause the
spring to relieve pressure against pressure plate.
The pressure plate is then pulled away from
driven plate by the spring retainers. See figure
4-1.
CLUTCH RELEASE
BEARING SUPPORT
SPRING WASHER
RELEASE BEARING
AND SLEEVE
CLUTCH SPRING
SPRING SEAT
- - - - HOUSING (LOWER)
Figure 4-2-Clutch and Flywheel Assembly-1948 Series 70
b. 1948 Series 70 Clutch
The clutch cover is bolted to the flywheel and
three lugs on the pressure plate engage slots in
the cover to transmit drive to the
plate.
Twelve
equally spaced clutch springs are located be-
tween the cover and pressure plate. Three clutch
release levers are pinned at their outer ends to
the pressure plate and to pivot screws attached
to the clutch cover. The inner ends of the re-
lease levers are in position to be engaged by
the clutch release bearing. See figure 4-2.
When the clutch is in the engaged position,
the release levers are clear of the release bear-
ing
and.
the clutch springs cause the pressure
plate to clamp the driven plate against the fly-
wheel with sufficient force to transmit power
of the engine without slippage. The power drive
is from flywheel to clutch cover, cover to pres-
sure plate, and from pressure plate and flywheel
to driven plate. .
When the clutch is disengaged, the clutch re-
lease bearing presses forward on the inner ends
of the release levers which pivot at the pivot
screws and force the pressure plate rearward
against the pressure of clutch springs. The pres-
sure plate is moved rearward far enough to
free the driven plate. See figure 4-2.
DRIVE
.:
WA
SHER
Figure 4-J-Driven Plate, Transmission
Side-·Serie.
40-50
c. Clutch Driven Plates
The clutch driven plate assembly is mounted
with a free sliding fit on the transmission main
drive gear and is keyed to the gear by ten
splines. The front end of the main drive gear is
piloted by a ball bearing pressed into a recess
in rear end
.
of engine crankshaft. See figures
4-1 and 4-2.
Clutch driven plate assemblies for all series
are of the same general design. The Series 40-
50
driven plate is 10 inches in diameter and the
1948 Series 70 driven plate is 10% inches in
diameter. Driven plates are furnished as as-
semblies only, since they are balanced during
manufacture either by grinding edge of facing
or by installation of balance rivets or weights.
See figure 4-4.
The outer area of the driven plate is divided
into segments which are formed in low waves
to provide springs between the plate facings
and thereby cushion engagement of the clutch.
A woven facing, grooved to give quick release,
is riveted to each side of every segment of
plate. When the clutch is fully released, the
waved segments cause the facings to spread
approximately .050" and the movement of pres-
sure plate provides approximately .030" clear-
ance to assure full release of driven plate. See
figures 4-3 and 4-4.
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