General Diagnostic - Subaru Legacy 2002 Service Manual

24. General Diagnostic

A: INSPECTION
1. MANUAL TRANSMISSION
Symptom
1. Gears are difficult to intermesh.
NOTE:
The cause for difficulty in shifting gears
can be classified into two kinds: one is
malfunction of the gear shift system and
the other is malfunction of the transmis-
sion. However, if the operation is heavy
and engagement of the gears is difficult,
defective clutch disengagement may
also be responsible. Check whether the
clutch is correctly functioning, before
checking the gear shift system and
transmission.
2. Gear slips out.
¼ Gear slips out when coasting on
rough road.
¼ Gear slips out during acceleration.
3. Unusual noise comes from transmis-
sion.
NOTE:
If an unusual noise is heard when the
vehicle is parked with its engine idling
and if the noise ceases when the clutch
is disengaged, it may be considered that
the noise comes from the transmission.
GENERAL DIAGNOSTIC
S503278
S503278A10
S503278A1001
(a) Worn, damaged or burred chamfer of
internal spline of sleeve and reverse
driven gear
(b) Worn, damaged or burred chamfer of
spline of gears
(c) Worn or scratched bushings
(d) Incorrect contact between synchro-
nizer ring and gear cone or wear
(a) Defective pitching stopper adjustment Adjust.
(b) Loose engine mounting bolts
(c) Worn fork shifter, broken shifter fork
rail spring
(d) Worn or damaged ball bearing
(e) Excessive clearance between splines
of synchronizer hub and synchronizer
sleeve
(f) Worn tooth step of synchronizer hub
(responsible for slip-out of 3rd gear)
(g) Worn 1st driven gear, needle bearing
and race
(h) Worn 2nd driven gear, needle bear-
ing and race
(i) Worn 3rd drive gear and bushing
(j) Worn 4th drive gear and bushing
(k) Worn reverse idler gear and bushing
(a) Insufficient or improper lubrication
(b) Worn or damaged gears and bear-
ings
NOTE:
If the trouble is only wear of the tooth
surfaces, merely a high roaring noise will
occur at high speeds, but if any part is
broken, rhythmical knocking sound will
be heard even at low speeds.
Possible cause
MT-107
Manual Transmission and Differential
Remedy
Replace.
Replace.
Replace.
Correct or replace.
Tighten or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Lubricate or replace with specified oil.
Replace.