Subaru Legacy 2003 Service Manual page 2594

12.General Diagnostic Table
A: INSPECTION
1. CLUTCH
Symptom
1. Clutch slippage.
It is hard to perceive clutch slippage in the early stage, but
pay attention to the following symptoms
• Engine speed up when shifting.
• High speed driving is impossible; especially rapid
acceleration impossible and vehicle speed does not
increase in proportion to an increase in engine speed.
• Power falls, particularly when ascending a slope, and
there is a smell of burning of the clutch facing.
• Method of testing: Put the vehicle in stationary condi-
tion with parking brake fully applied. Disengage the
clutch and shift the transmission gear into the first. Gradu-
ally allow the clutch to engage while gradually increasing
the engine speed. The clutch function is satisfactory if the
engine stalls. However, the clutch is slipping if the vehicle
does not start off and the engine does not stall.
2. Clutch drags.
As a symptom of this trouble, a harsh scratching noise
develops and control becomes quite difficult when shift-
ing gears. The symptom becomes more apparent when
shifting into the first gear. However, because much trou-
ble of this sort is due to defective synchronization mecha-
nism, carry out the test as described after.
• Method of testing: <Ref. to CL-42, DIAGNOSTIC DIA-
GRAM OF CLUTCH DRAG, INSPECTION, General Diag-
nostic Table.>
It may be judged as insufficient disengagement of clutch
if any noise occurs during this test.
3. Clutch chatters.
Clutch chattering is an unpleasant vibration to the whole
body when the vehicle is just started with clutch partially
engaged.
4. Noisy clutch
Examine whether the noise is generated when the clutch
is disengaged, engaged, or partially engaged.
GENERAL DIAGNOSTIC TABLE
(a) Clutch facing smeared by oil
(b) Worn clutch facing
(c) Deteriorated diaphragm
spring
(d) Distorted pressure plate or fly-
wheel
(e) Defective release bearing
holder
(a) Worn or rusty clutch disc hub
spline
(b) Excessive deflection of clutch
disc facing
(c) Seized crankshaft pilot needle
bearing
(d) Cracked clutch disc facing
(e) Sticked clutch disc (smeared
by oil or water)
(a) Adhesion of oil on the facing
(b) Weak or broken torsion spring Replace clutch disc.
(c) Defective facing contact or
excessive disc
(d) Warped pressure plate or fly-
wheel
(e) Loose disc rivets
(f) Loose engine mounting
(g) Faulty pitching stopper
(a) Broken, worn or unlubricated
release bearing
(b) Insufficient lubrication of pilot
bearing
(c) Loose clutch disc hub
(d) Loose torsion spring retainer
(e) Deteriorated or broken torsion
spring
CL-41
Possible cause
Replace.
Replace.
Replace.
Correct or replace.
Correct or replace.
Replace clutch disc.
Correct or replace.
Replace.
Replace.
Replace.
Replace clutch disc.
Replace clutch disc defection.
Correct or replace.
Replace clutch disc.
Retighten or replace mounting.
Replace.
Replace release bearing.
Apply grease.
Replace clutch disc.
Replace clutch disc.
Replace clutch disc.
CLUTCH SYSTEM
Corrective