Isuzu N-Series. Service manual - part 602

6A1-96 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE

10. Power Steering Pump & Bracket Assembly (Power

Steering Model)
1) Loosen the idler pulley lock nut.
2) Loosen the adjust bolt then remove the drive

belt.

3) Remove the pipe bracket fixing bolt and clip.
4) Remove the power steering pump fixing bolts

pump to chassis frame side use the wire.

11. Actuator Vacuum Hose (Exhaust Brake Model)

• Disconnect the vacuum hose from actuator side.

12. Vacuum Pump Hose (Exhaust Brake Model)

• Disconnect the vacuum hose from vacuum tank

side and magnetic valve side.

13. Front Exhaust Pipe

• Remove the exhaust pipe fixing bolts from exhaust

manifold.

• Remove the exhaust pipe stay bolt.
• Remover the fixing nuts from front pipe.

Legend

1. Bracket
2. Clip
3. Lock nut

N6A3290E

N6A3362E

N6A3363E

N6A3364E

4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-97

14. Support Rubber

1) Right Hand

• Remove two fixing nuts at the cross member

side.

2) Left Hand

• Remove two fixing nuts at the cross member

side.

15. Engine Assembly

1) Lift engine carefully by using hoist.

2) Lift front part of engine higher than rear part of

it.

3) Take out engine assembly taking care not to

damage full pipes, brake pipes and so on.

Installation

1. Engine Assembly

• Position engine mountings by using hoist.

2. Support Rubber

• After all fixing bolts (left: two bolts, right: two bolts)

were inserted to every holes, and engine asm and
tighten fixing bolts to the specified torque.

Tighten:

• 40  N

⋅m (4.1 kg⋅m / 30 lb⋅ft)

3. Front Exhaust Pipe

• Connect the exhaust pipe and tighten nut to the

specified torque.

Tighten:

• Exhaust pipe nut to 69 N

⋅m (7.0 kg⋅m / 51 lb⋅ft)

N6A3294E

N6A3300E

N6A3367E

N6A3300E

6A1-98 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE

• Install the exhaust pipe stay and tighten bolt nut to

the specified torque.

Tighten:

• Stay bolt nut to 40 N

⋅m (4.1 kg⋅m / 30 lb⋅ft)

4. Vacuum Pump Hose (Exhaust Brake Model)

• Connect the vacuum hose to vacuum tank side and

magnetic valve side.

5. Actuator Vacuum Hose (Exhaust Brake Model)

• Connect the vacuum hose to actuator.

6. Power Steering Pump & Bracket Assembly (Power

Steering Model)

• Install the power steering pump and pipe bracket

then tighten bolts to the specified torque.

Tighten:

• Pump bolts to 19 N

⋅m (1.9 kg⋅m / 14 lb⋅ft)

• Pipe bracket bolts to 19 N

⋅m (1.9 kg⋅m / 14 lb⋅ft)

• Clip bolt to 10 N

⋅m (1.0 kg⋅m / 87 lb⋅in)

• Install Power Steering pump drive belt (1) and ad-

just belt tension.
Check drive belts for wear or damage, and replace
with new ones as necessary.
Check belts for tension, and adjust as necessary.

N6A3294E

N6A3364E

Legend

1. Bracket
2. Clip
3. Lock nut

N6A3363E

N6A3362E

4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-99

• Push the middle of belts with a force of 10 kg and

check each bolt for deflection.

• Standard deflection

4JG2

• P/S pump lock bolt loose, adjust belt tension with

adjust belt.

Tighten:

• Idler lock nut to 27 N

⋅m (2.8 kg⋅m / 20 lb⋅ft)

4JB1

7. A/C Compressor Assembly (A/C Model)

• Install the A/C compressor fixing bolts and tighten

bolts to the specified torque.

Tighten:

• Compressor fixing bolts to 37 N

⋅m (3.8 kg⋅m / 27 lb⋅ft)

• Connect the magnetic clutch harness connector.
• Install A/C compressor drive belt (1) and adjust belt

tension.
Check drive belts for wear or damage, and replace
with new ones as necessary. Check belts for ten-
sion, and adjust as necessary.

• Push the middle of belts with a force of 10kg and

check each bolt for deflection.

• Standard deflection

4JG2

mm (in)

Initial tension

P/S pump drive belt

8 — 12 (0.31 — 0.47)

Legend

1. A/C compressor drive belt & P/S pump drive 

belt

2. AC generator & fan pulley drive belt

N6A3427E

N6A3295E

mm (in)

Initial tension

A/C compressor drive belt

8 — 12 (0.31 — 0.47)

N6A3290E

N6A3428E