Subaru Legacy 2005 Service Manual page 2788

MANUAL TRANSMISSION AND DIFFERENTIAL
26.General Diagnostic Table
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 de-
fective gear shift system and the other is
defective transmission. However, if the
operation is heavy and engagement of the
gears is difficult, defective clutch disen-
gagement may also be responsible.
Check whether the clutch is correctly
functioning, before checking the gear shift
system and transmission.
2. Gear slip-out.
• Gear slips out when coasting on rough
road.
• Gear slips out during acceleration.
3. Noise emits from the transmission.
NOTE:
If noise is heard when the vehicle is
parked with its engine idling and if a noise
ceases when the clutch is disengaged, it
may be considered that the noise comes
from the transmission.
General Diagnostic Table
Possible cause
(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
(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 bearing
and race
(i) Worn 3rd drive gear and bushing
(j) Worn 4th drive gear and bushing
(k) Worn 5th drive gear and bushing
(l) Worn 6th drive gear and bushing
(m) Worn reverse idler gear and bushing
(a) Insufficient or improper lubrication
(b) Worn or damaged gears and bearings
NOTE:
If the trouble is only wear of the tooth sur-
faces, merely a high roaring noise will oc-
cur at high speeds, but if any part is
broken, rhythmical knocking sound will be
heard even at low speeds.
6MT-126
Corrective action
Replace.
Replace.
Replace.
Correct or replace.
Adjust.
Tighten or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Lubricate with specified oil or replace.
Replace.