Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 1995-1999 Approved Subaru Legacy 1995 1995 Service Manual TRANSMISSION AND DIFFERENTIAL SECTION MANUAL TRANSMISSION AND DIFFERENTIAL MSA5TCD95L5570

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DIAGNOSTICS 3-1
1. Manual Transmission and Differential

1. Manual Transmission and
Differential
Symptom and possible cause Remedy
1. Gears are difficult to intermesh.
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 transmission. 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.
(a) Worn, damaged or burred chamfer of internal spline of Replace.
sleeve and reverse driven gear
(b) Worn, damaged or burred chamfer of spline of gears Replace.
(c) Worn or scratched bushings Replace.
(d) Incorrect contact between synchronizer ring and gear Correct or replace.
cone or wear
2. Gear slips out.
(1) Gear slips out when coasting on rough road.
(2) Gear slips out during acceleration.
(a) Defective pitching stopper adjustment Adjust.
(b) Loose engine mounting bolts Tighten or replace.
(c) Worn fork shifter, broken shifter fork rail spring Replace.
(d) Worn or damaged ball bearing Replace.
(e) Excessive clearance between splines of synchronizer hub Replace.
and synchronizer sleeve
(f) Worn tooth step of synchronizer hub (responsible for slip- Replace.
out of 3rd gear)
(g) Worn 1st driven gear, needle bearing and race Replace.
(h) Worn 2nd driven gear, needle bearing and race Replace.
(i) Worn 3rd drive gear and bushing Replace.
(j) Worn 4th drive gear and bushing Replace.
(k) Worn reverse idler gear and bushing Replace.
3. Unusual noise comes from transmission.
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.
(a) Insufficient or improper lubrication Lubricate or replace with specified oil.
(b) Worn or damaged gears and bearings Replace.
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.

69
3-1 DIAGNOSTICS
1. Manual Transmission and Differential

Symptom and possible cause Remedy
4. Broken differential (case, gear, bearing, etc.)
Abnormal noise will develop and finally it will become impossible to continue to run due to broken pieces obstructing the gear
revolution.
(a) Insufficient or improper oil Disassemble differential and replace broken components and
at the same time check other components for any trouble,
and replace if necessary.
(b) Use of vehicle under severe conditions such as excessive Readjust bearing preload and backlash and face contact of
load and improper use of clutch gears.

(c) Improper adjustment of taper roller bearing Adjust.
(d) Improper adjustment of drive pinion and hypoid driven Adjust.
gear
(e) Excessive backlash due to worn differential side gear, Add recommended oil to specified level. Do not use vehicle
washer or differential pinion under severe operating conditions.
(f) Loose hypoid driven gear clamping bolts Tighten.
5. Differential and hypoid gear noises
Troubles of the differential and hypoid gear always appear as noise problems. Therefore noise is the first indication of the
trouble. However noises from the engine, muffler, tire, exhaust gas, bearing, body, etc. are easily mistaken for the differential
noise. Pay special attention to the hypoid gear noise because it is easily confused with other gear noises. There are the
following four kinds of noises.
(1) Gear noise when driving: If noise increases as vehicle speed increases it may be due to insufficient gear oil, incorrect
gear engagement, damaged gears, etc.
(2) Gear noise when coasting: Damaged gears due to maladjusted bearings and incorrect shim adjustment
(3) Bearing noise when driving or when coasting: Cracked, broken or damaged bearings
(4) Noise which mainly occurs when turning: Unusual noise from differential side gear, differential pinion, differential pinion
shaft, etc.
(a) Insufficient oil Lubricate.
(b) Improper adjustment of hypoid driven gear and drive Check tooth contact.
pinion
(c) Worn teeth of hypoid driven gear and drive pinion Replace as a set.
Readjust bearing preload.
(d) Loose roller bearing Readjust hypoid driven gear to drive pinion backlash and
check tooth contact.
(e) Distorted hypoid driven gear or differential case Replace.
(f) Worn washer and differential pinion shaft Replace.

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