Subaru 2009 IMPREZA Service Manual page 2183

CLUTCH SYSTEM
Symptom
4. Noisy clutch
Noise occurs when the clutch is disen-
gaged, engaged, or partially engaged.
5. Clutch grabs suddenly.
When starting the vehicle with the clutch
partially engaged, the clutch engages
suddenly and the vehicle jumps instead
of making a smooth start.
2. CLUTCH PEDAL
Insufficient pedal play
Insufficient clutch pedal free play
Excessively worn and damaged pedal shaft and/or bushing
3. DIAGNOSTIC DIAGRAM OF CLUTCH DRAG
Step
1 CHECK GEAR NOISE.
1) Start the engine.
2) Disengage the clutch and shift quickly from
neutral to reverse in idling condition.
2 CHECK GEAR NOISE.
Disengage the clutch at idle and shift from neu-
tral to reverse within 0.5 — 1.0 seconds.
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 neu-
tral to reverse, reverse to neutral several times.
General Diagnostic Table
Possible cause
(a) Broken, worn or insufficiently lubri-
cated release bearing
(b) Insufficient lubrication of the pilot
bearing
(c) Loose clutch disc hub
(d) Loose damper spring retainer
(e) Deteriorated or broken damper spring Replace the clutch disc.
(a) Grease or oil on facing
(b) Deteriorated cushioning spring
(c) Worn or rusted spline of clutch disc or
main shaft
(d) Deteriorated or broken damper spring Replace the clutch disc.
(e) Loose engine mounting
(f) Deteriorated diaphragm spring
Symptom
Adjust the free play of the pedal.
Adjust the free play of the pedal.
Replace the bushing or shaft with a new part.
Check
Is there any abnormal noise
from the transmission gear?
Is there any abnormal noise
from the transmission gear?
Is there any abnormal noise
from the transmission gear?
CL-30
Corrective action
Replace the release bearing.
Replace the pilot bearing.
Replace the clutch disc.
Replace the clutch disc.
Replace the clutch disc.
Replace the clutch disc.
Take off rust, apply grease or replace
clutch disc or main shaft.
Retighten or replace mounting.
Replace.
Corrective action
Yes
Go to step 2. Clutch is normal.
Go to step 3. Defective trans-
mission or exces-
sive clutch drag
torque. Inspect
pilot bearing,
clutch disc, trans-
mission and clutch
disc hub spline.
Inadequate clutch Clutch and fly-
disengage. Inspect wheel seizure.
the clutch disc, Inspect the clutch
clutch cover, clutch disc and the spline
release, and clutch of the clutch disc
pedal free play. hub.
No