Pontiac FIREBIRD 1972 Service Manual page 814

7-2 1972 PONTIAC SERVICE MANUAL
3. Worn facing or facing tom from driven plate. 3. Loose engine mountings.
4. Warped pressure plate or flywheel. 4. Warped pressure plate or flywheel.
5. Weak diaphragm spring.
5. Burned or smeared resin on flywheel or pressure
plate.
6. Driven plate not seated in
-
make 20-40 normal starts.
7. Driven plate overheated
-
allow to cool and check
lash.
GRABBING
1. Oil on facing or burned or glazed facings.
2. Worn splines on clutch (main drive) gear.
RATTLING
-
TRANSMISSION CLICK
1. Clutch fork loose on ball stud or in bearing groove.
2. Oil in driven plate damper
-
replace driven plate.
3. Driven plate damper spring failure
-
replace driven
plate.
GENERAL DESCRIPTION
A single plate, dry friction disc, diaphragm-spring type
prevent sticking of the plate to the flywheel and the pres-
clutch is used on all cars with manual transmissions. The
sure plate due to vacuum between the members on disen-
clutch assembly consists of the clutch driven plate, cover-
gaging.
pressure plate and clutch release mechanism.
The clutch cover and pressure plate of all clutch assem-
he clutch driven plate has aspn%
hub to reduce
blies is of the diaphragm-spring type that not only pro-
the transmitting of torsional vibrations from the engine to
vides the spring pressure required to hold the friction disc
the transmission.
against the flywheel, but also acts as the release levers that
Grooves on both sides of the clutch driven plate lining
take up the spring
when the clutch is disengaged.
ENGINE FLYWHEEL
FLYWHEELTO
CRANKSHAFT BOLT
DRIVEN
PLATE
CLUTCHCOVER BOLT
CLUTCH RELEASE BEARING
CLUTCH RELEASE FORK
AND
PRESSURE PLATE
Fig. 7-1 Exploded V i e w o f Typical Clutch and Flywheel