check oil ISUZU TFS SERIES 1997 Workshop Manual

4B-28 REAR AXLE
Differential cage
Check the ring gear the side gear fitting faces and the cross pin
hole for scores or roughness. Correct as necessary. Slight
scores or roughness may be corrected with an oil stone or fine
sand paper.

Friction disc and plate assembly.
Check the parts for damage or other abnormal conditions.
Check the friction plate for distortion.
Limit mm(in) 0.07 (0.0027)
Check the friction plate for wear.
Limit (A - B) mm(in) 0.1 (0.0039)
Note : A = Non-sliding face thickness
B = Sliding face thickness
Check the friction disc for distortion.
Limit mm(in) 0.07 (0.0027)

4B-52 REAR AXLE
TROUBLESHOOTING
Refer to this Section to quickly diagnose and repair rear axle problems.
Each troubleshooting chart has three headings arranged from left to right.
(1) Checkpoint (2) Trouble Cause (3) Countermeasure
This Section is divided into five sub-sections:
1. Abnormal Rear Axle Noise
1) Noise when the engine is driving the vehicle
2) Noise when the vehicle is coasting
3) Intermittent noise
4) Noise when the vehicle is turning
5) Constant noise
2. Vibration
3. Oil Leakage
1) Differential carrier leakage
2) Axle case leakage
3) Axle case to inside hub leakage
4) Axle case to inside brake drum leakage
4. Power Not Being Transmitted to the Wheels (Propeller Shaft Operation is Normal)

REAR AXLE 4B-53
1. ABNORMAL REAR AXLE NOISE
1) Noise when the Engine is Driving the Vehicle
Checkpoint Trouble Cause Countermeasure
Replenish the gear oilInsufficient gear oil NG
Differential side bearingAdjust the differential side
bearing preload
Replace the drive pinion
bearings
Adjust the drive pinion bearing
preload
Replace the gear oil
Loose differential side
bearings
W orn drive pinion bearings
Loose drive pinion bearings
W rong or poor grade gear oil
Drive pinion to ring gear
backlash
Drive pinion end play
Adjust the backlashToo much or too little backlash
Continued on the next pageOK OK
NG NG NG NG NG
OK
OK
Rear axle gear oil
Replace the differential side
bearingsW orn differential side bearings NG

REAR AXLE 4B-57
5) Constant Noise
Checkpoint Trouble Cause Countermeasure
Replace the rear axle shaftBent rear axle shaft NG
Replace the side bearing
Replace the drive pinion
bearing
Replace the drive pinion and
the ring gear as a set
Replace the drive pinion and
the ring gear as a set
Flat spot on the side bearing
oil seal
BearingFlat spot on the drive pinion
Flat spot on the gear teeth
pilot bearing wear
Drive pinionFlat spot on the drive pinion
gear teeth
Ring gear
Replace the drive pinion and
the ring gear as a setW orn pinion splines oil seal
NG NG NG NG NG
OK OK
OK
Rear axle shaft

REAR AXLE 4B-59
3. OIL LEAKAGE
1) Differential Carrier Leakage
Checkpoint Trouble Cause Countermeasure
Correct the oil levelToo much gear oil NG
Reapply the liquid gasket
and/or tighten the lock nut to
the specified torque
Reapply the liquid gasket
Tighten the bolts to the
specified torque
Replace the oil seal
Ring gear thrust boltLoose lock nut and/or liquid
Liquid gasket seal bed
Loose bolts
Oil sealW orn or defective oil seal
Differential carrier
Clean the air breatherAir breatherClogged air breather
NG NG NG NG NG
OK OK OK
OK
Gear oil level

4B-60 REAR AXLE
2) Axle Case Leakage
Checkpoint Trouble Cause Countermeasure
Tighten the drain plug and/or
replace the gasket(s)Loose drain plug and/or
defective gasket(s) NG
Reapply the liquid gasket
Tighten the bolts to the
specified torque
Clean the air breather
Liquid gasket seal bad
Loose bolts
Air breatherClogged air breather
Differential carrier
Replace the axle caseAxle caseCracked axle case
NG NG NG NG
OK OK
OK
Oil filler and drain plug

REAR AXLE 4B-61
3) Axle Case to Inside Brake Drum Leakage
Checkpoint Trouble Cause Countermeasure
Replace the oil sealW orn or defective oil seal NGOil seal

4C1-18 FRONT WHEEL DRIVE
INSPECTION AND REPAIR
Make all necessary adjustments, repairs, and part replacements if wear, damage, or other problems are discovered
during inspection.
BJ assembly
DOJ case, ball, ball guide, ball retainer
Bellows
Bearing
Dust seal, oil seal
Visual Check
Inspect the following parts for wear, damage, or other
abnormal conditions.

FRONT WHEEL DRIVE 4C1-27
INSPECTION AND REPAIR
Make all necessary adjustments, repairs, and part replacements if wear, damage, or other problems are discovered
during inspection.
Ring gear, pinion gear
Bearing
Side gear, pinion gear, cross pin
Differential cage, carrier
Thrust washer
Oil seal
Visual Check
Inspect the following parts for wear, damage, or other
abnormal conditions.
Ring Gear Replacement
(1) The ring gear should always be replaced with the drive
pinion as a set.
(2) W hen installing the ring gear, apply LOCTITE 271 or
equivalent to the threaded hole and bolt.
(3) Tighten the fixing bolts in a diagonal sequence as
illustrated.
(4) Discard used bolts and install new ones.
Bolt Torque N
m (kgfm/lbft)
167 mm 78.5
9.8 (8 1/57.9 7.2)
194 mm 107.9 9.8 (11 1/79.6 7.2)
For 167 mm
Note that all bolts have a left hand thread.
Clearance Between the Differential Pinion
and the Cross Pin
mm(in)
Standard Limit
167 mm 0.06 - 0.12 (0.002 - 0.005) 0.2 (0.008)
194 mm 0.05 - 0.10 (0.002 - 0.004) 0.2 (0.008)

4C1-44 FRONT WHEEL DRIVE
INSPECTION AND REPAIR
Make necessary correction or parts replacement if wear, damage or any other abnormal conditions are found
through inspection.
Hub
Hub bearing
Bearing outer race
Disc
Oil seal
Visual Check
Check the following parts for wear, damage or other abnormal
conditions.