Isuzu N-Series. Manual — part 194
FRONT AXLE 4C-71
• To adjust backlash, loosen bearing cap bolts
slightly and move the dummy bearing (1) as
necessary.
A clearance should not be provided between
dummy bearing and bearing fitting face of the
differential cage.
2) Inspection of drive pinion and ring gear tooth
contact.
• Apply a thin coat of red check to faces of the 7
— 8 teeth of the ring gear.
• Check the impression of contact obtained on
the ring gear teeth and make necessary adjust-
ment as described below if the contact is abnor-
mal.
N4A0153E
N4A0154E
N4A0155E
4C-72 FRONT AXLE
3) Selection of Preload Adjusting Shim
• Measure the clearance between the differential
carrier and right and left side (dummy) bearings
by using a feeler gauge.
Carefully note the relationship between the val-
ues obtained through measurement at each
side and dummy bearings.
• Measure the thickness of dummy bearing and
side bearing.
Comparison should be made between the
thicknesses of dummy bearing and side bear-
ing installed in the same position.
TOOTH CONTACT
CASE
ADJUSTMENT PROCEDURE
Drive pinion is too far away
from ring gear.
1. Move the drive pinion in to-
ward the ring gear by de-
creasing the thickness of
pinion depth adjusting
shims.
2. Adjust the backlash by
moving ring gear away from
the drive pinion.
Drive pinion is too close to
the ring gear.
1. Move the drive pinion away
from the ring gear by in-
creasing thickness of pinion
depth adjusting shims.
2. Adjust the backlash by
moving ring gear in toward
the drive pinion.
Ring gear is too close to
the drive pinion.
1. Move the drive pinion in to-
ward the ring gear by de-
creasing thickness of pinion
depth adjusting shims.
2. Adjust the backlash by
moving ring gear away from
the drive pinion.
Ring gear is too far away
from drive pinion.
1. Move the drive pinion away
from the ring gear by in-
creasing thickness of pinion
depth adjusting shims.
2. Adjust the backlash by
moving ring gear in toward
the drive pinion.
N4A0156E
N4A0160E
N4A0157E
N4A0161E
N4A0158E
N4A0162E
N4A0159E
N4A0163E
N4A0164E
FRONT AXLE 4C-73
When side bearing is thinner:
A + (dummy bearing thickness
− side bearing
thickness) = (X)
When side bearing is thicker:
A
− (side bearing thickness − dummy bearing
thickness) = (X)
• (X) + 0.025 = Shim thickness
Allowance for bearing preload at one side =
0.025
• Example of calculation
Thickness of shim available: 0.25, 0.30, 0.35, 0.5 mm
(0.009, 0.012, 0.014, 0.019 in)
13. Side Bearing Inner Race
Installer: 5-8840-2050-0
Grip: 9-8522-1608-0
14. Differential Cage Assembly and Ring Gear
15. Side Bearing Outer Race
16. Bearing Cap
1) Install bearing caps by aligning setting marks
(1) applied at disassembly.
Tighten:
Bearing cap bolt to 108 N
⋅m (11.0 kg⋅m / 80 lb⋅ft)
Legend
1. Dial gauge
2. Dummy bearing
3. Side bearing
mm (in.)
Measured Clearance A:
+0.85 (+0.033)
Suppose that the side bearing is
thicker [thinner] than dummy
bearing by 0.05 mm
−0.05 (−0.002)
[+0.05 (+0.002)]
An allowance for bearing pre-
load:
+0.025 (+0.0009)
Thickness of shims to be
installed:
0.825 (0.032)
[0.925 (0.036)]
N4A0165E
Legend
A. Measured clearance
A
′. Shim installed position
N4A0166E
N4A0167E
4C-74 FRONT AXLE
2) Recheck the backlash. If measurement indi-
cates that the backlash deviates from the spec-
ified range, make an adjustment by shifting the
position of shims in use without varying the total
thickness.
Recheck the ring gear for run-out at the rear
face.
If the amount of run-out is excessive, repeat the
disassembly and reassembly steps.
Ring gear run-out,
Standard: 0.05 mm (0.002 in)
Limit: 0.2 mm (0.008 in)
N4A0168E
N4A0169E
N4A0170E
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