Pontiac Fiero 1988 Service Manual page 913

7C-6 HYDRAULIC CLUTCH
CLUTCH MECHANICAL DIAGNOSIS
CONDITION
PROBABLE CAUSE CORRECTION
Fails to Release (pedal
pressed to floor-shift lever
does not move freely in
and out of reverse gear
without gear clash)
a. Faulty driven disc.
b. Fork and bearing not assembled
properly.
c. Clutch disc hub binding on input
shaft splines.
d. Clutch disc warped or bent.
e. Clutch-to-flywheel bolts loose.
a. Replace disc.
b. Install properly and* lubricate fingers
at release bearing with wheel bearing
grease.
c. Repair or replace.
d. Replace disc.
e. Torque bolts to specification.
*Very lightly lubricate fingers.
Slipping a. Improper operation.
b. Oil soaked driven disc.
c. Worn facing or facing torn from disc.
d. Warped pressure plate or flywheel.
e. Weak diaphragm spring.
f. Driven plate not seated in.
g. Driven plate overheated.
a. Correct as required.
b. Install new disc and correct leak at its
source.
c. Replace disc.
d. Replace pressure plate or flywheel.
e. Replace pressure plate.
f. Make 30 to 40 normal starts.
C A U T I O N : Do not overheat.
g. Allow to cool.
Grabbing (Chattering) a. Oil on facing. Burned or glazed
facings.
b. Worn splines on input shaft.
c. Loose engine mountings.
d. Warped pressure plate or flywheel.
e. Burned or smeared resin on flywheel
or pressure plate.
a. Install new disc and correct U ak
to engine or transaxle.
b. Replace input shaft.
c. Tighten or replace mountings.
d. Replace pressure plate or flywheel.
e. Sand off if superficial, replaced burned
or heat checked parts.
Rattling-Transmission Click a. Release fork loose.
b. Oil in driven plate damper.
c. Driven plate damper spring failure.
d. Low engine idle speed.
a. Install properly.
b. Replace driven disc.
c. Replace driven disc.
d. Adjust idle speed.
Release Bearing Noise with
Clutch Fully Engaged
a. Improper operation.
b. Release bearing binding.
c. Fork shaft improperly installed.
d. Faulty bearing.
a. Correct as required.
b. Clean, relubricate, check for burrs,
nicks, etc.
c. Install properly.
d. Replace bearing.
Noisy a. Worn release bearing.
b. Fork shaft improperly installed.
a. Replace bearing.
b. Install properly and lubiicate fo-k
fingers at bearing.
Pedal Stays on Floor a. Fork shaft binds in housing. a. Free-up shaft and lubricate.
Hard Pedal Effort
a. Driven plate worn.
b. Fork shaft binds in housing.
a. Replace driven plate.
b. Free-up shaft and lubricate.
520025 7C
Figure 8 Clutch Mechanical Diagnosis