Isuzu N-Series. Manual — part 172
REAR AXLE 4B-45
292 mm/320 mm Rear Differential
Major Components
This illustration is based on the 292 mm differential.
Legend
1. Lock plate
6. Drive pinion cage assembly
2. Bearing cap
7. Shim
3. Adjust nut
8. Pilot bearing retainer
4. Side bearing outer race
9. Pilot bearing
5. Differential cage assembly
N4A0178E
4B-46 REAR AXLE
Disassembly
1. Lock Plate
2. Bearing Cap
Set the differential assembly onto a special fixture.
Apply a setting mark to the right and left side bear-
ing caps to prevent interchanging.
3. Adjust Nut
4. Side Bearing Outer Race
Keep the side bearing outer race and inner races
separate to prevent interchanging.
5. Differential Cage Assembly
6. Drive Pinion Cage Assembly
7. Shim
8. Pilot Bearing Retainer
9. Pilot Bearing
Reassembly
1. Pilot Bearing
2. Pilot Bearing Retainer
The fixing nut should be on the inboard side of the
case.
3. Differential Cage Assembly
4. Side Bearing Outer Race
Install the outer and inner races, so that original
combination is maintained.
N4A0179E
N4A0137E
Legend
1. Setting mark
2. Pinion cage
3. Shim
N4A0180E
N4A0181E
REAR AXLE 4B-47
5. Bearing Cap
Install the bearing caps by aligning setting marks
(1) applied at disassembly.
6. Adjust Nut
1) Threaded groove in nut should be properly
aligned with threaded groove in the carrier.
2) Tighten the adjust nuts so that they can be
turned after installing and semi-tightening bear-
ing caps.
Inspection of Ring Gear for Run-Out
• 292 mm differential
Standard: 0.05 mm (0.002 in)
Limit: 0.2 mm (0.008 in)
• 320 mm differential
Standard: 0.08 mm (0.003 in)
Limit: 0.25 mm (0.010 in)
7. Shim
8. Drive Pinion Cage Assembly
Install the shim removed and pinion aligning the oil
hole or setting mark applied on removal.
Tighten:
Drive pinion cage bolt to
• 292 mm differential: M12 bolt to 69 N
⋅m (7.0 kg⋅m / 51
lb
⋅ft), M14 bolt to 78 N⋅m (8.0 kg⋅m / 58 lb⋅ft)
• 320 mm differential: 72 N
⋅m (7.3 kg⋅m / 53 lb⋅ft)
N4A0137E
N4A0182E
N4A0183E
N4A0184E
4B-48 REAR AXLE
Backlash between Drive Pinion and Ring Gear
Backlash,
292 mm differential: 0.18 — 0.23 mm (0.007 — 0.009 in)
320 mm differential: 0.19 — 0.29 mm (0.007 — 0.011 in)
Bearing preload,
N.S.K. bearing: 5.7 — 13.0 N (0.58 — 1.33 kg / 1.3 —
2.9 lb)
Koyo bearing 11.5 — 17.9 N (1.17 — 1.83 kg /2.6 — 4.0
lb)
Side Bearing Preload Adjustment
Thread the adjust nut on the ring gear side into 2 notch-
es to give a proper bearing preload when correct back-
lash and tooth contact are obtained.
Fully tighten the bearing cap bolts.
Tighten:
Bearing cap bolt to
• 292 mm differential: 108 N
⋅m (11 kg⋅m / 80 lb⋅ft)
• 320 mm differential: 157 N
⋅m (16 kg⋅m / 116 lb⋅ft)
Recheck the backlash after tightening the bearing cap
bolts.
Inspection of Drive Pinion and Ring Gear Tooth
Contact
• Apply a thin coat of red check to the faces of the 7
— 8 teeth of the ring gear.
• Check the impression of contact (Right contact)
obtained on the ring gear teeth and make neces-
sary adjustment as described below if the contact
is abnormal.
N4A0185E
N4A0186E
N4A0187E
N4A0188E
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