General Diagnostic Table - Subaru Legacy 2002 Service Manual

Clutch System

12. General Diagnostic Table

S504257
A: INSPECTION
1. CLUTCH
S504257A1002
Symptom
1. Clutch slippage.
It is hard to perceive clutch slippage in
the early stage, but pay attention to the
following symptoms
¼ Engine speed up when shifting.
¼ High speed driving is impossible;
especially rapid acceleration impossible
and vehicle speed does not increase in
proportion to an increase in engine
speed.
¼ Power falls, particularly when ascend-
ing a slope, and there is a smell of burn-
ing of the clutch facing.
¼ Method of testing: Put the vehicle in
stationary condition with parking brake
fully applied. Disengage the clutch and
shift the transmission gear into the first.
Gradually 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 shifting
gears. The symptom becomes more
apparent when shifting into the first gear.
However, because much trouble of this
sort is due to defective synchronization
mechanism, carry out the test as
described after.
¼ Method of testing: <Ref. to CL-35,
DIAGNOSTIC DIAGRAM OF CLUTCH
DRAG, INSPECTION, General Diagnos-
tic Table.>
It may be judged as insufficient disen-
gagement of clutch if any noise occurs
during this test.
3. Clutch chatters.
Clutch chattering is an unpleasant vibra-
tion to the whole body when the vehicle
is just started with clutch partially
engaged.
GENERAL DIAGNOSTIC TABLE
S504257A10
(a) Clutch facing smeared by oil
(b) Worn clutch facing
(c) Deteriorated diaphragm spring
(d) Distorted pressure plate or flywheel
(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 bear-
ing
(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
(c) Defective facing contact or excessive
disc
(d) Warped pressure plate or flywheel
(e) Loose disc rivets
(f) Loose engine mounting
(g) Improper adjustment of pitching stop-
per
Possible cause
CL-34
Corrective
Replace.
Replace.
Replace.
Correct or replace.
Correct or replace.
Replace clutch disc.
Correct or replace.
Replace.
Replace.
Replace.
Replace clutch disc.
Replace clutch disc.
Replace clutch disc defection.
Correct or replace.
Replace clutch disc.
Retighten or replace mounting.
Adjustment.