DI-76
DIFFERENTIALS
General Diagnostic Table
9. General Diagnostic Table
A: INSPECTION
Symptom or trouble
Possible cause
Remedy
1. Oil leakage
(1) Worn, scratched or incorrectly seated
front or side oil seal. Scored, battered or
excessively worn sliding surface of com-
panion flange.
Correct or replace.
(2) Clogged or damaged air breather.
Clean, repair or replace.
(3) Loose bolts on differential spindle or
side retainer, or incorrectly fitted O-ring.
Tighten the bolts to specified torque.
Replace the O-ring.
(4) Loose rear cover attaching bolts or
damaged gasket.
Tighten the bolts to specified torque.
Replace gasket and apply liquid gasket.
(5) Loose oil filler or drain plug.
Retighten and apply liquid gasket.
(6) Wear, damage or incorrectly fitting for
spindle, side retainer and oil seal.
Correct or replace.
2. Seizure
NOTE:
Seized or damaged parts should be re-
placed, and also other parts should be
thoroughly checked for any defect and
should be repaired or replaced as re-
quired.
(1) Insufficient backlash for hypoid gear.
Readjust or replace.
(2) Excessive preload for side, rear or
front bearing.
Readjust or replace.
(3) Insufficient or improper oil used.
Replace seized part and fill with specified
oil to specified level.
3. Damage
NOTE:
Damaged parts should be replaced, and
also other parts should be thoroughly
checked for any defect and should be re-
paired or replaced as required.
(1) Improper backlash for hypoid gear.
Replace.
(2) Insufficient or excessive preload for
side, rear or front bearing.
Readjust or replace.
(3) Excessive backlash for differential
gear.
Replace gear or thrust washer.
(4) Loose bolts and nuts such as hypoid
driven gear bolt.
Retightening.
(5) Damage due to overloading.
Replace.
4. Noises when starting or shifting
gears
NOTE:
Noises may be caused by differential as-
sembly, universal joint, wheel bearing,
etc. Find out what is actually making noise
before disassembling.
(1) Excessive backlash for hypoid gear.
Readjust.
(2) Excessive backlash for differential
gear.
Replace gear or thrust washer.
(3) Insufficient preload for front or rear
bearing.
Readjust.
(4) Loose drive pinion nut.
Tighten to specified torque.
(5) Loose bolts and nuts such as side
bearing retainer attaching bolt.
Tighten to specified torque.
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.
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