Isuzu N-Series. 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
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