Isuzu N-Series. Service manual — part 193
FRONT AXLE 4C-67
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
4C-68 FRONT AXLE
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:
Bearing 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: 9-8522-1137-0
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
FRONT AXLE 4C-69
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. Distance Piece (NKR model)
9. Bearing Preload Adjusting Shim
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:
Bearing 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)
Tighten:
Dummy nut to 270 N
⋅m (27.5 kg⋅m / 199 lb⋅ft)
N4A0148E
N4A0149E
N4A0150E
N4A0145E
4C-70 FRONT AXLE
Thickness of shim available: 1.53, 1.56 ... 2.07, 2.10 mm
(0.060, 0.061 ... 0.081, 0.082 in)
10. Flange
11. Flange Nut
Once specified bearing preload is obtained by
dummy nut, remove dummy nut and replace with
flange nut.
Tighten the flange nut until specified bearing pre-
load and nut torque.
Using special tool, stake the flange nut at two
points.
Punch: 5-8840-2293-0
12. Backlash and Preload Adjusting Shim
1) Adjustment of Backlash
• Install dummy bearing in the differential cage
assembly, then install differential cage assem-
bly and ring gear into the differential carrier.
Install the bearing caps after checking to make
certain setting marks (1) applied at disassem-
bly are in alignment.
Tighten:
Bearing cap bolt to 108 N
⋅m (11.0 kg⋅m / 80 lb⋅ft)
• Set the dial indicator and measure the backlash
between the drive pinion and ring gear at the
foot portion of the ring gear.
Backlash: 0.15 — 0.20 mm (0.006 — 0.008 in)
N4A0151E
N4A0145E
N4A0151E
N4A0152E
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