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7 C-4
1977 PONTIAC SERVICE MANUAL
CONDITION
Fails t o Release (Pedal pressed
t o floor-shift lever does n o t
move freely i n and o u t of
With Clutch Fully Engaged
Noisy
Pedal Stays o n Floor When
Disengaged
I
Hard Pedal Effort
-
PROBABLE CAUSE
a. lmproper linkage adjustment
b. lmproper pedal travel
c. Loose linkage
d. Faulty pilot bearing
e. Faulty driven disc
f. Fork o f f ball stud
g. Clutch disc hub binding o n clutch
gear spline
h. Clutch disc warped or bent
a. lmproper adjustment (no lash)
b. Oil soaked driven disc
c. Worn facing or facing t o r n f r o m disc
d. Warped pressure plate or flywheel
e. Weak diaphragm spring
f. Driven plate not seated i n
g. Driven plate overheated
-
-
-
- -
a. Oil o n facing. Burned o r glazed
facings
b. Worn splines o n clutch gear
c. Loose engine mountings
d. Warped pressure plate o r flywheel
e. Burned o r smeared resin o n flywheel
o r pressure plate
a. Weak retracting springs
b. Clutch f o r k loose o n ball stud o r i n
bearing groove
c. Oil i n driven plate damper
d. Driven plate damper spring failure
a. lmproper adjustment. N o lash.
b. Release bearing binding o n trans-
mission bearing retainer
c. Insufficient tension between clutch
fork spring and ball stud
d. Fork improperly installed
e. Weak linkage return spring
a. Worn release bearing
b. Fork o f f ball stud (heavy clicking)
c. Pilot bearing loose i n crankshaft
a. Bind i n linkage or release bearing
b. Springs weak i n pressure plate
c. Springs being over traveled
a. Bind i n linkage
b. Driven plate worn
CORRECTION
a. Adjust linkage
b. T r i m bumper stop and adjust linkage
c. Replace as necessary
d. Replace bearing
e. Replace disc
f. Install properly and* lubricate fingers
at release bearing w i t h wheel bearing
grease
g. Repair or replace clutch gear and/or
disc
h. Replace disc ( r u n o u t should n o t
exceed .020")
*Very lightly lubricate fingers
-
a. Adjust linkage t o spec.
b. Install new disc and correct leak at its
source
c. Replace disc
d. Replace pressure plate or flywheel
e. Replace pressure plate (be sure lash is
checked before replacing plate)
f. Make 30 t o 40 normal starts
CAUTION: Do N o t Overheat
g. Allow t o cool
-
check lash
-
-
a. Install new disc and correct leak
b. Replace transmission clutch gear
c. Tighten or replace mountings
d. Replace pressure plate or flywheel
e. Sand o f f if superficial, replace burned
or heat checked parts
a. Replace pressure plate
b. Check ball stud and retaining
c. Replace driven disc
d. Replace driven disc
- -
a. Adjust linkage,
b. Clean, relubricate, check for burrs,
nicks, etc.
c. Replace fork
d. Install properly
e. Replace spring
a. Replace bearing
b. l nstall properly and lubricate fork
fingers at bearing
c. See Section
6
f o r bearing fits
a. Lubricate and free u p linkage and
release bearing
b. Replace pressure plate
c. Adjust linkage t o get proper lash, be
sure proper pedal stop (bumper) is
installed
a. Lubricate and free u p linkage
b. Replace driven plate
446C
Fig. 7C-4 Clutch Trouble Diagnosis Chart
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