Subaru Impreza 2003, Service Manual

Page: 2113 / 3610

CL-51
CLUTCH SYSTEM
GENERAL DIAGNOSTIC TABLE
2. CLUTCH PEDAL
3. DIAGNOSTIC DIAGRAM OF CLUTCH DRAG
4. Noisy clutch
Examine whether the noise is generated
when the clutch is disengaged, engaged,
or partially engaged. (a) Broken, worn or unlubricated release
bearing Replace the release bearing.
(b) Insufficient lubrication of pilot bearing Apply grease.
(c) Loose clutch disc hub Replace the clutch disc.
(d) Loose torsion spring retainer Replace the clutch disc.
(e) Deteriorated or broken torsion spring Replace the clutch disc.
5. Clutch grabs.
When starting the vehicle with the clutch
partially engaged, the clutch engages
suddenly and the vehicle jumps instead
of making a smooth start. (a) Grease or oil on facing Replace the clutch disc.
(b) Deteriorated cushioning spring Replace the clutch disc.
(c) Worn or rusted spline of clutch disc or
main shaft Take off rust, apply grease or replace the
clutch disc or main shaft.
(d) Deteriorated or broken torsion spring Replace the clutch disc.
(e) Loose engine mounting Retighten or replace the mounting.
(f) Deteriorated diaphragm spring Replace.
Trouble Corrective action
Insufficient pedal play Adjust pedal play.
Clutch pedal free play insufficient Adjust pedal free play.
Excessively worn and damaged pedal shaft and/or bushing Replace the bushing and/or shaft with a new one.
Step Check Yes No
1 CHECK GEAR NOISE.
1)Start the engine.
2)Disengage the clutch and shift quickly from
neutral to reverse in idling condition.
Is there any abnormal noise
from the transmission gear? Go to step 2. Clutch is normal.
2 CHECK GEAR NOISE.
Disengage the clutch at idle and shift from neu-
tral to reverse within 0.5 — 1.0 seconds.
Is there any abnormal noise
from the transmission gear? Go to step 3. Defective trans-
mission or exces-
sive clutch drag
torque.
Inspect the pilot
bearing, clutch
disc, transmission
and clutch disc
hub spline.
3 CHECK GEAR NOISE.
1)Disengage the clutch at idle and shift from
neutral to reverse within 0.5 — 1.0 seconds.
2)With the clutch disengaged, shift from N to
R, R to N several times.
Is there any abnormal noise
from the transmission gear? Defect in clutch
disengaging.
Inspect the clutch
disc, clutch cover,
clutch release, and
clutch pedal free
play. Clutch and fly-
wheel seizure.
Inspect the clutch
disc, spline of
clutch disc hub.
Symptom Possible cause Corrective