Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 1995-1999 Approved Subaru Legacy 1999 1999 Service Manual TRANSMISSION AND DIFFERENTIAL SECTION AWD SYSTEM MSA5TCD99L221

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3-4 [K200] DIAGNOSTICS
2. Rear Differential

2. Rear Differential
Symptom Possible cause Remedy
1. Oil leakage (1) Worn, scratched, or incorrectly seated front or Repair or replace.
side oil seal. Scored, battered, or excessively worn
sliding surface of companion flange.
(2) Clogged or damaged air breather. Clean, repair or replace.
(3) Loose bolts on differential spindle or side Tighten bolts to specified torque.
retainer, or incorrectly fitted O-ring. Replace O-ring.
(4) Loose rear cover attaching bolts or damaged Tighten bolts to specified torque.
gasket. Replace gasket and apply liquid
packing.
(5) Loose oil filler or drain plug. Retighten and apply liquid packing.
(6) Wear, damage or incorrectly fitting for spindle, Repair or replace.
side retainer and oil seal.
2. Seizure (1) Insufficient backlash for hypoid gear. Readjust or replace.
NOTE:
Seized or damaged parts should (2) Excessive preload for side, rear, or front bearing. Readjust or replace.
be replaced, and also other parts
should be thoroughly checked for (3) Insufficient or improper oil used. Replace seized part and fill with
any defect and should be repaired specified oil to specified level.
or replaced as required.
3. Damage (1) Improper backlash for hypoid gear. Replace.
NOTE: (2) Insufficient or excessive preload for side, rear, or Readjust or replace.
Damaged parts should be front bearing.
replaced, and also other parts
(3) Excessive backlash for differential gear. Replace gear or thrust washer.
should be thoroughly checked for
any defect and should be repaired (4) Loose bolts and nuts such as crown gear bolt. Retighten.
or replaced as required. (5) Damage due to overloading. Replace.
4. Noises when starting or shift- (1) Excessive backlash for hypoid gear. Readjust.
ing gears
(2) Excessive backlash for differential gear. Replace gear or thrust washer.
NOTE:
Noises may be caused by differen- (3) Insufficient preload for front or rear bearing. Readjust.
tial assembly, universal joint, wheel (4) Loose drive pinion nut. Tighten to specified torque.
bearing, etc. Find out what is actu-
ally making noise before disassem- (5) Loose bolts and nuts such as side bearing Tighten to specified torque.
bly. retainer attaching bolt.
5. Noises when cornering (1) Damaged differential gear. Replace.
(2) Excessive wear or damage of thrust washer. Replace.
(3) Broken pinion mate shaft. Replace.
(4) Seized or damaged side bearing. Replace.
6. Gear noises (1) Improper tooth contact of hypoid gear. Readjust or replace hypoid gear
NOTE: set.
Since noises from engine, muffler,
transmission, propeller shaft, wheel (2) Improper backlash for hypoid gear. Readjust.
bearings, tires, and body are
sometimes mistaken for noises (3) Scored or chipped teeth of hypoid gear. Replace hypoid gear set.
from differential assembly, be care-
ful in checking them. Inspection (4) Seized hypoid gear. Replace hypoid gear set.
methods to locate noises include
coasting, accelerating, cruising, (5) Improper preload for front or rear bearings. Readjust.
and jacking-up all four wheels.
Perform these inspections accord- (6) Seized, scored, or chipped front or rear bearing. Replace.
ing to condition of trouble. When
listening to noises, shift gears into (7) Seized, scored, or chipped side bearing. Replace.
four wheel drive and fourth speed
position, trying to pick up only dif- (8) Vibrating differential carrier. Replace.
ferential noise.

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