User Guide
EXEDY Globalparts Corporation • 800.346.6091 • www.exedyusa.com
EXEDY Globalparts Corporation • 800.346.6091 • www.exedyusa.com
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Malfunctions of Clutch Discs
Malfunctions of Clutch Discs
PROBLEM:
Broken facing of clutch disc on clutch cover
assembly pressure plate side.
SYMPTOM:
Noisy clutch/slipping clutch.
CAUSE:
1. Improper driving practice; down changing
gear constantly.
2. The speed of the vehicle is actually higher than
of the shifted to gear.
3. The gear box and drive train revolutions are
turning faster than the speed of the engine at the
time: sudden clamp damaged the facings.
4. Excessive grease on the transmission input shaft.
SOLUTION:
Driver education. Proper tting practice.
SYMPTOM:
Broken clutch facings ywheel side.
PROBLEM:
Clutch slips, does not disengage.
CAUSE:
1. Overloading vehicle.
2. Clutch disc has been replaced but not clutch
pressure plate cover assembly.
3. Lack of applied load (inecient diaphragm
spring pressure or coil spring pressure).
SOLUTION:
1. Do not overload vehicle.
2. Replace with complete clutch kit.
PROBLEM:
No drive, power not transmitted because of
broken segments on clutch disc.
SYMPTOM:
Sudden clutch failure.
CAUSE:
Cushion spring steel segments uniformly
separated from hub area due to:
1. Faulty or worn pilot bearing or bushing.
2. Hanging gear box during installation.
3. Dirt or chips between the mating surfaces of
the engine bolt up areas.
4. Gearbox/transmission lock up. (i.e. Gear tooth
jam).
SOLUTION:
1. Check pilot bushing or bearing and replace if
necessary. Align gear box and use the assistance
of a transmission jack and always clean mating
surfaces before installation.
2. Check gear box for metal fragments than
remove and repair as necessary.
PROBLEM:
Premature wear cerametallic button type clutch
disc.
SYMPTOM:
Slipping clutch.
CAUSE:
Bedding-in procedure not observed for
cerametallic buttons.
SOLUTION:
Drivers education; observe bedding in
procedure. Due to the weight of this type of
disc it takes longer for the rotating clutch to
slow down while clutch cover assembly is in a
separation position away from the clutch disc.
Clutch must be depresses a few seconds longer
whilst shifting gear specically when there is no
clutch brake attached to the system.
PROBLEM:
Clutch disc completely ruined.
SYMPTOM:
Sudden clutch failure.
CAUSE:
Clutch disc tted incorrectly i.e. back to front.
SOLUTION:
1. Always check clutch disc on ywheel for
fouling before installation.
2. Always refer to installation procedures on
EXEDY/Daikin packaging.
PROBLEM:
Damaged torsion springs.
SYMPTOM:
Gear box rattle/noisy clutch - diesel applications.
Other descriptions of problem are: jarrah noise,
gear box rollover noise or tick over noise.
CAUSE:
When engine torque is higher than clutch torque
this causes springs to deteriorate. This is due to
the very dierent characteristics in design of this
particular clutch disc.
SOLUTION:
Choose and t and appropriate EXEDY/Daikin
clutch to suit this application (e.g. silent type
design or LTD design).