Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 954

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 oil

Insufficient gear oil

NG

Differential side bearing

Adjust the differential side

bearing preload

Replace the drive pinion

bearings

Adjust the drive pinion bearing

preload

Replace the gear oil

Loose differential side

bearings

Worn drive pinion bearings

Loose drive pinion bearings

Wrong or poor grade gear oil

Drive pinion to ring gear

backlash

Drive pinion end play

Adjust the backlash

Too much or too little backlash

Continued on the next page

OK

OK

NG

NG

NG

NG

NG

OK

OK

Rear axle gear oil

Replace the differential side

bearings

Worn differential side bearings

NG

4B-54  REAR AXLE

Checkpoint

Trouble Cause

Countermeasure

Replace the drive pinion and

the ring gear as a set

Excessive ring gear run-out

Replace the drive pinion and

the ring gear as a set

Drive pinion and/or ring gear

damage

NG

NG

Drive pinion and ring gear

Continued from the previous page

Replace the drive pinion and

the ring gear as a set

Worn drive pinion and ring

gear

NG

2) Noise when the Vehicle is Coasting

Checkpoint

Trouble Cause

Countermeasure

Replace the ring gear and the

pinion as a set

Ring gear damaged

Adjust the backlash

Insufficient backlash

OK

Ring gear

NG

NG

Drive pinion and ring gear

backlash

REAR AXLE  4B-55

3) Intermittent Noise

Checkpoint

Trouble Cause

Countermeasure

Axle case inside

Ring gear

Remove the foreign material

Replace the drive pinion and

the ring gear as a set

Foreign material in the axle

case

Warped ring gear

Differential cage

Tighten the differential cage

bolts

Replace the shaft

Loose differential cage bolts

Too much spline play

OK

NG

NG

NG

NO

OK

OK

Axle shaft

4B-56  REAR AXLE

4) Noise when the Vehicle is Turning

Checkpoint

Trouble Cause

Countermeasure

Differential cross pin

Side gear

Replace the differential cross

pin

Replace the side gear

Worn differential cross pin

Worn side gear

Differential pinion

Replace the differential pinion

Replace the rear axle shaft

Worn differential pinion

Worn rear axle shaft splines

OK

NG

NG

NG

NO

OK

OK

Rear axle shaft