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