Isuzu N-Series. Service manual — part 169
REAR AXLE 4B-33
Disassembly
1. Bearing cap
Set the differential assembly onto a special fixture.
Apply a setting mark (1) to the side bearing cap
and differential carrier.
Fixture: 5-8840-2029-0
Base: 5-8840-0003-0
2. Side Bearing Outer Race
After removal, keep right and left side bearing as-
semblies separate to maintain inner and outer race
combinations.
3. Differential Cage Assembly
4. Side Bearing Inner Race
Remover: 9-8521-0061-0
Adapter: 5-8840-2031-0
5. Backlash and Preload Adjusting Shim
6. Flange Nut
Holding wrench: 9-8511-1507-0
7. Flange
8. Bearing Preload Adjusting Shim
9. Distance Piece (NKR model)
10. Collapsible Spacer (NHR model)
11. Drive Pinion
12. Inner Bearing Inner Race
Remover: 5-8840-0015-0
13. Inner Bearing Outer Race
14. Pinion Depth Adjusting Shim
15. Oil Seal
16. Outer Bearing Inner Race
17. Outer Bearing Outer Race
Drive out the inner bearing outer race or the outer
bearing outer race together with the outer bearing
inner race and oil seal by using a proper bar
through two notches.
N4A0136E
N4A0137E
N4A0138E
N4A0139E
4B-34 REAR AXLE
Reassembly
Measurement of ring gear run-out
Install dummy bearing into the differential assembly,
then install these parts in the differential carrier.
Install and tighten the bearing cap.
Dummy bearing: 9-8522-1137-0
Tighten:
Bearing cap bolt to 108 N
⋅m (11.0 kg⋅m / 80 lb⋅ft)
Ring gear run-out,
Standard: 0.05 mm (0.002 in)
Limit: 0.2 mm (0.008 in)
1. Outer Bearing Outer Race
2. Pinion Depth Adjusting Shim
3. Inner Bearing Outer Races
Adjustment of drive pinion engagement depth.
Install the inner and outer bearing outer races with-
out shims into the differential carrier using a bench
press.
Installer (inner): 9-8522-1196-0
(Outer): 9-8522-1197-0
Grip: 9-8522-1148-0
Assemble the inner bearing inner race to the dum-
my pinion shaft, then install these parts into the
carrier.
Dummy Pinion Shaft: 9-8522-1603-0
Install the outer bearing inner race, flange, washer
and dummy nut.
Lubricate the bearing before tighten the dummy
nut.
Dummy Nut: 9-8522-1624-0
N4A0140E
N4A0141E
N4A0142E
N4A0143E
REAR AXLE 4B-35
Tighten the dummy nut until specified preload are
required to rotate the bearing.
Bearing preload
New bearing: 16 — 29 N (1.6 — 3.0 kg / 3.5 — 6.6 lb)
Used bearing: 8 — 14.5 N (0.8 — 1.5 kg / 1.8 — 3.3 lb)
Tighten:
Starting to
• New bearing: 0.69 — 1.27 N
⋅m (7.0 — 13.0 kg⋅cm /
6.1 — 11.3 lb
⋅in)
• Used bearing: 0.35 — 0.64 N
⋅m (3.5 — 6.5 kg⋅cm /
3.1 — 5.7 lb
⋅in)
Install dummy bearing on dummy shaft and install
these parts into the carrier. Install and tighten the
bearing cap.
Dummy Shaft: 9-8522-1138-0
Dummy Bearing: 8-8522-1137-0
Tighten:
Bearing cap bolt to 108 N
⋅m (11.0 kg⋅m / 80 lb⋅ft)
Measure the clearance (t) with a feeler gauge.
The clearance (t) is equal to the shim in thickness.
Thickness of shim available, 2.12, 2.16 ... 2.52, 2.56 mm
(0.083, 0.085 ... 0.099, 0.100 in)
Remove dummy pinion, dummy shaft, dummy
bearing and inner bearing outer race.
Install pinion depth adjusting shim of specified
thickness in position between the inner bearing
outer race and the carrier, then install the inner
bearing outer race.
Installer: 9-8522-1196-0
Grip: 9-8522-1148-0
Legend
1. Coupling driver
2. Outer bearing
3. Dummy pinion shaft
4. Inner bearing
5. Shim
N4A0144E
N4A0145E
N4A0146E
N4A0147E
4B-36 REAR AXLE
4. Inner Bearing Inner Race
Installer: 9-8522-0018-0
Apply gear oil to the pinion shaft before installing fi-
nal drive pinion assembly into carrier.
5. Outer Bearing Inner Race
6. Oil seal
Installer: 5-8840-2047-0
7. Drive Pinion
8. Collapsible Spacer (NHR model)
Discard used collapsible spacer and install a new
one.
9. Distance Piece (NKR model)
10. Bearing Preload Adjusting Shim (NKR model)
Use a dummy nut until specified bearing preload is
obtained.
Bearing preload
New bearing: 16 — 29 N (1.6 — 3.0 kg / 3.5 — 6.6 lb)
Used bearing: 8 — 14.5 N (0.8 — 1.5 kg / 1.8 — 3.3 lb)
Tighten:
Starting to
• New bearing: 0.69 — 1.27 N
⋅m (7.0 — 13.0 kg⋅cm /
6.1 — 11.3 lb
⋅in)
Tighten:
Dummy nut to 270 N
⋅m (27.5 kg⋅m / 199 lb⋅ft)
N4A0148E
N4A0149E
N4A0150E
N4A0145E
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