Isuzu N-Series. Service manual - part 375

6A3-152 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)

2. Engine Assembly

1) Make sure that the connecting pipes, hoses,

and cables have all been removed from the en-
gine.

2) Operate the hoist to slowly raise the engine un-

til it is clear of the chassis frame.

3) Rotate the engine 90 degrees.
4) Continue to lift the engine from the chassis.
5) Carefully move the hoist and engine.
6) Set the engine on an engine stand.

Installation

Engine Mounting Side

1. Engine Assembly

1) Attach a lifting wire to the engine lifting hang-

ers.

2) Operate the hoist to position the engine above

the chassis frame.

3) Carefully lower the engine until it is just above

the chassis frame.

4) Rotate the engine 90

° to position it for final in-

stallation.

5) Carefully set the engine to the chassis.

The front of the engine should be held higher
than the rear at this time.
Be careful not to damage the exposed parts.

N6A0766E

N6A0767E

N6A0768E

N6A0768E

ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-153

6) Lower the engine until it contacts the engine

mounting crossmember.

7) Set the engine mounting rubbers to the engine

mounting crossmember.

8) Temporarily tighten the engine mounting rub-

ber bolts.
The bolts will be finally tightened after the trans-
mission has been installed to the engine and
the engine rear mounting bracket and the No.3
crossmember connected.

2. Engine Mount

Install the engine mount with it set to the holes of
the engine mount crossmember. Then tighten it to
the specified torque.

Tighten:
Mounting rubber nut to 48 N

⋅m (4.9 kg⋅m/35 lb⋅ft)

Engine Right Side

1. ACG Harness
2. ACG Vacuum Hose

1) Connect the B terminal cable and the harness

connector.

2) Connect the vacuum hoses to the vacuum

pump.

3. Air Conditioning (A/C) Compressor

• Tighten the fixing bolts to the specified torque.

Tighten:
A/C compressor bolt to 48 N

⋅m (4.9 kg⋅m/35 lb⋅ft)

Notice:
When tightening the compressor fixing bolts, tighten the
first 2 bolts on the rear side, and then the remaining 2 on
the front.

N6A0767E

N6A0771E

Legend

1. ACG vacuum hose
2. ACG harness

N6A0772E

N6A0417E

6A3-154 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)

• Install the drive belt adjust belt tension by ad-

justing bolt and tighten the locking nut to the
specified torque.

• Depress the drive belt mid-portion with a 98 N

(10 kg/22 lb) force.

Tighten:
Locking nut to 27 N

⋅m (2.8 kg⋅m/20 lb⋅ft)

4. Power Steering Pump

Tighten:
Bolt to 

• (1): 43 N

⋅m (4.4 kg⋅m/32 lb⋅ft)

• (2): 44 N

⋅m (4.5 kg⋅m/33 lb⋅ft)

5. Front Exhaust Pipe

Tighten:
Front exhaust pipe to

• Exhaust manifold side: 67 N

⋅m (6.8 kg⋅m/49 lb⋅ft)

• Exhaust brake side: 17 N

⋅m (1.7 kg⋅m/12 lb⋅ft)

• Cylinder body side: 17 N

⋅m (1.7 kg⋅m/12 lb⋅ft)

Engine Front Side

1. Fan

Tighten:
Fan bolt to 24 N

⋅m (2.4 kg⋅m/17 lb⋅ft)

2. Radiator

Tighten:
Radiator bracket bolt to 55 N

⋅m (5.6 kg⋅m/41 lb⋅ft)

Drive Belt Deflection

mm (in)

16 — 20 (0.63 — 0.79) ... New belt

18 — 22 (0.71 — 0.87) ... Reuse belt

Legend

1. Belt deflection

N6A0418E

N6A0775E

N6A0597E

ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-155

3. Fan Guide
4. Radiator Lower Hose
5. Coolant Reserve Tank Hose/Bypass Hose
6. Radiator Upper Hose

Engine Left Side

1. Fuel Feed Hose
2. Fuel Return Hose

Air Bleeding

1) Loosen the priming pump cap (2) at the side of

the injection pump.

2) Loosen the bleeder valve (1) (4HF1) at the top

of the fuel filter.

3) Operate the priming pump to bleed the air from

the injection pump.

4) Retighten the bleeder valve.
5) Operate the priming pump.

Check for fuel leakage from around the injec-
tion pump and the fuel filter.

6) Lock the priming pump cap to the injection

pump.

For 4HE1-TC

3. Accelerator Control Cable

1) Check to see if the idling control knob is turned

to the extreme left.

2) Attach the end tip of the cable to the engine

control lever.

3) Pull the outer cable toward the front of the vehi-

cle, and provide the engine control wire and the
inner cable with an appropriate play before fas-
tening the clamp with a nut.

Legend

1. Stud bolt
2. Rubber
3. Washer
4. Flange nut
5. Flame side bracket
6. Radiator side bracket

N6A0611E

N6A0778E

N6A0779E