User Guide

EXEDY Globalparts Corporation • 800.346.6091 • www.exedyusa.com
EXEDY Globalparts Corporation • 800.346.6091 • www.exedyusa.com
5150
Diagnosing Bearing Noises
Malfunctions of Other Clutch Components
PROBLEM: Excessive score marks on clutch thrust bearing.
SYMPTOM: Excessive free travel/clutch does not disengage/
noisy - Japanese range of trucks.
CAUSE: Incorrectly tted clutch thrust bearing carrier
to clutch release fork causing bearing carrier to
spin o the fork tips and bearing carrier saddle.
This problem could also be caused if the tension
on the release bearing carrier wire clip in not
sucient.
SOLUTION: 1. All care should be taken when replacing
bearing carrier on the clutch fork. Also ensure the
retaining spring clip has sucient tension.
2. Always work clutch thrust bearing carrier both
forward and backward to ensure that the fork is
retained rmly on the carrier saddle.
PROBLEM: Broken saddle clip.
SYMPTOM: Noisy rattle and dicult to engage gear.
CAUSE: Careless installation as spring retaining clip not
assembled to fork during installation, or tension
on wire retaining clip not correct.
SOLUTION: 1. Check tension on wire retaining clip.
2. Always check bearing on clutch release fork
after installing bearing on it. Move the fork in
both directions to ensure bearing is secure
before retting gear box.
PROBLEM: Worn clutch thrust bearing carrier.
SYMPTOM: Pulsating pedal with engine running.
CAUSE: Faulty installation as the clutch thrust bearing
carrier is worn on the saddle where the fork
pivots. This also reduces the tension on the
wear clip retainer. In this case, due to the lack
of tension the fork has become dislodged and
scored the back of the bearing.
SOLUTION: Always replace worn clutch thrust bearing
carriers and worn forks.
1. Clutch release bearing
A. Depress the clutch pedal
approximately 2”. the bearing
is now in contact with the
diaphragm. Should the bearing
rumble or squeal then the
clutch release bearing is most
likely at fault (providing it has
been pressed onto the carrier
the right way around.)
2. Pilot Bearing or Bush.
A. With engine running depress
the clutch fully.
B. Select rst gear.
C. Release the clutch.
If the squeal is heard at the
point of the clutch taking up,
then the pilot bearing is faulty.
In the event it is a bronze bush
it will indicate lack of lubrication
on the I.D. of the bush. If the
bush has been lubricated
on the I.D. there is a greater
possibility that the O.D. of the
bush is under sized and worn.
The noise is then caused by
the bush spinning in the end
of the crank. If new pilot bush
has not been pressed in evenly
this could also result in the bush
spinning which would cause
a grumbling or squealing
noise. Pilot bush noises are
more apparent when engine
and transmission are cold.
(i.e. In the morning).
3. Front gear box
bearing
A. Drive the vehicle at
approximately 30 kilometers
per hour in gear. If a
noticeable grumble noise is
apparent, depress the clutch
pedal. This will, in turn, stop
the main drive and bearing
from spinning. If noise ceases
it is probable that the front
gear box bearing is faulty
(as there is no load on the
bearing).
Diagnosing Bearing Noises