Buick LeSabre 1965 Service Manual page 138

4 - 2 45000 CLUTCH
CLUTCH, S-M TRANSMISSIONS
DIAPHRAGM SPRING
COVER
F O
*
K
RETRACTING SPRING
FLYWHEEL
DOWEL PIN
PRESSURE PLATE
PILOT BUSHING
Figure 4 - 1 — Standard Clutch
4 - 2 CLUTCH DESCRIPTION
All 45000 synchromesh cars are
equipped with a single plate dry
disc clutch, using a diaphragm
spring assembly. See Figure 4-1.
a. Release
Depressing the clutch pedal
causes movement of the clutch
fork in the direction shown in
Figure 4-2. Actual operation of
the linkage in this operation is
explained in paragraph C below.
The clutch fork, pivoting on a ball
stud, acts upon the throw out bear-
ing. The bearing in turn, forces
the tangs of the diaphragm spring
in the direction shown in Figure
4-2. The diaphragm spring, be-
ing retained in the clutch cover
by 9 rivets and 2 wire rings, is
mounted in such a way that the
spring can pivot or dish on these
rings, again reversing the direc-
THROWOUT BEARING
PRESSURE
PLATE
PIVOT POINT
CLUTCH FORK
DRIVEN PLATE
FLYWHEEL
CRANKSHAFT
Figure 4-2—Clutch Releasing Action
tion of force. This force is ap-
plied directly to the 3 retracting
springs which, in turn, pull the
pressure plate rearward and out
of contact with the driven plate.
b. Clutch Driven Plate
The clutch driven plate assembly
is mounted with a free sliding fit
on the transmission main drive