Subaru XT 1988 Service Manual page 744

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4WD SYSTEM 3-4
TROUBLESHOOTING
Rear Differential
Symptom and possible cause
Oil leakage
• Worn, scratched, or incorrectly seated front or side
oil seal. Scored, battered, or excessively worn sliding
surface of companion flange.
• Clogged or damaged air breather.
• Loose bolts on differential spindle or side retainer, or
incorrectly fitted a-ring.
• Loose rear cover attach ing bolts or damaged gasket.
• Loose oil filler or drain plug.
• Wear, damage or incorrectly fitting for spindle, side
retainer and oil seal.
Seizure
Remedy
Repair or replace.
Clean, repair or replace.
Tighten bolts to specified torque. Replace a-ring.
Tighten bolts to specified torque. Replace gasket and
apply liquid packing.
Retighten and apply liquid packing.
Repair or replace.
Seized or damaged parts should be replaced, and also other parts should be thoroughly checked for any defect and
should be repaired or replaced as required.
• Insufficient backlash for hypoid gear.
• Excessive preload for side, rear, or front bearing.
• Insufficient or improper oil used.
Damage
Readjust or replace.
Readjust or replace.
Replace seized part and fill with specified oil to specified
level.
Damaged parts should be replaced, and also other parts should be thoroughly checked for any defect and should be
repaired or replaced as required.
• Improper backlash for hypoid gear.
• Insufficient or excessive preload for side, rear, or
front bearing.
• Excessive backlash for differential gear.
• Loose bolts and nuts such as drive gear bolt.
• Damage due to overloading.
Noises when starting or shifting gears
Replace.
Readjust or replace.
Replace gear or thrust washer.
Retighten.
Replace.
Noises may be caused by differential ASSY, universal joint, wheel bearing, etc. Find out what is actually making noise
before disassembly.
• Excessive backlash for hypoid gear.
• Excessive backlash for differential gear.
• Insufficient preload for front or rear beari ng.
• Loose self-locking nut.
• Loose bolts and nuts such as side bearing retainer
attaching bolt.
31
Readjust.
Replace gear or thrust washer.
Readjust.
Tighten to specified torque.
Tighten to specified torque.