Isuzu N-Series. Manual — part 184
FRONT AXLE 4C-31
Removal
Preparation:
Jack up and support the vehicle on stands.
1. Wheel and Tire
2. Hub with Brake Drum
3. Cover
4. Wheel Brake Assembly
5. Tie Rod Assembly
Remover
Driver Side: 5-8840-2017-0
Assistant Side: 5-8840-2018-0
6. Knuckle Arm
7. Tie Rod Arm
Remover: 5-8840-2019-0
Drive out with a heavy hammer.
8. King Pin Cover
9. Key Bolt
Remover: 5-8840-2020-0
10. Plate Plug
11. King Pin
Remover:
NHR 5-8840-2021-0
NKR, NPR 5-8840-2022-0
NQR 5-8840-2022-0
12. Knuckle
13. Shim
14. Thrust Bearing
15. I-Beam
Inspection and Repair
Make the necessary adjustments, repairs, and part re-
placements if excessive wear or damage is discovered
during inspection.
Visual Check
Inspect the following parts for wear, damage or other ab-
normal conditions.
• I-beam
• Knuckle
N4A0303E
N4A0304E
N4A0305E
N4A0306E
4C-32 FRONT AXLE
• Knuckle arm, tie rod arm
• Tie rod, tie rod end
• King pin, bushing, thrust bearing and shims
• Joint ball
• Front hub, bearing and oil seal
• Brake drum
• Brake shoe, lining etc.
I-Beam (when removed from the vehicle)
1. Fit the king pin or test bar (1) into the king pin hole.
2. Stretch a cord (2) across the centers of king pin or
test bars.
3. Check to see if the cord is in line with the centers
of the center bolt holes (3) in the spring seat when
looked down from above the cord.
4. Also check to see if the king pins or test bar are in
good parallel alignment as viewed from the side.
5. Check to see if the king pin holes is worn.
6. Stretch a cord (1) and check the following dimen-
sions.
Cracks in Knuckles
Check the knuckles for cracks or damage paying a par-
ticular attention to the areas indicated by arrows.
Use a magnetic flaw detector or red check.
N4A0308E
N4A0309E
‘05 model
mm (in)
θ
H1
H2
H3
L1
L2
NHR
12
°
97
(3.8)
135.3
(5.3)
25.2
(0.99)
260
(10.2)
690
(27.2)
NKR
97
(3.8)
134.4
(5.3)
260
(10.2)
690
(27.2)
NPR
83
(3.3)
120.4
(4.7)
315
(12.4)
860
(33.9)
NQR
83
(3.3)
120.4
(4.7)
315
(12.4)
860
(33.9)
N4A0310E
N4A0311E
FRONT AXLE 4C-33
• NHR
A: 30 mm (1.19 in)
B: 40 mm (1.57 in)
• NKR, NPR, NQR
A: 35 mm (1.38 in)
B: 50 mm (1.97 in)
Knuckle Arm and Tie Rod Arm
Check tapered portion of the knuckle arms and tie-rod
arms for abnormal contact in the following manner.:
Apply a thin coat of red check evenly to the tapered por-
tion of the shaft and insert the shaft into the tapered
hole. Remove the shaft and check impression of contact
obtained on the shaft.
Correction or parts replacement is necessary if the con-
tact is uneven or if contact area is smaller than 3/4 of the
entire length of the shaft.
King Pin Diameter
• NHR
A: 25.0 mm (0.984 in)
B: 24.9 mm (0.980 in)
• NKR, NPR, NQR
A: 30.0 mm (1.181 in)
B: 29.9 mm (1.177 in)
Clearance between King Pin and Bushing
Standard: 0.06 mm (0.0024 in)
Limit: 0.15 mm (0.0059 in)
Notice:
Install the king pin bushing by aligning its grease hole
with grease fitting hole in the knuckle.
Fit of king pin into the king pin bushing can be checked
in the following manner.
Clamp the knuckle with king pin bushings in a vise and
insert the king pin into the bushings. Check for radial
play by moving the king pin in direction at a right angle
to its axis, then move the king pin endwise with finger.
Legend
1. Contact are is longer than 3/4 of the entire
length of the shaft.
N4A0312E
N4A0313E
N4A0314E
N4A0315E
4C-34 FRONT AXLE
If fitting of king pin into the bushing is too tight, carefully
cut inner face of the bushing with a reamer, so that up-
per and lower holes in the knuckle are well centered.
Installation
1. I-Beam
2. Knuckle
3. Thrust Bearing
1) Apply grease.
2) Turn the bearing case-side upward.
4. Shim
Check the clearance between the knuckle and
front axle.
Standard: 0 — 0.10 mm (0 — 0.004 in)
Limit: 0.20 mm (0.0079 in)
Shim available thickness, 0.50, 0.55, 0.60, 0.65, 0.70,
0.80, 0.90 mm (0.019, 0.022, 0.024, 0.026, 0.028,
0.031, 0.035 in)
5. King Pin
1) Apply grease.
2) Align the key groove with the key bolt hole in
the front axle.
3) After installing the king pin, check that the
knuckle turns smoothly.
N4A0316E
N4A0317E
Legend
1. Case
N4A0318E
N4A0319E
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