Isuzu N-Series. Service manual — part 341
6A3-16 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
4. Leak off Pipe
5. Fuel Pipe
Do not apply excessive force to the fuel pipes.
6. Positive Crankcase Ventilation (PCV) Hose
Disconnect the PCV hose from inlet cover (1).
7. Fuel Injection Pipe
1) Loosen the injection pipe sleeve nuts (1).
2) Do not apply excessive force to the injection
pipes (5).
3) Loosen the injection pipes clips (3).
4) Remove the injection pipe assembly.
Plug the delivery valve holder (2) ports and
nozzle holder (4) ports with caps to prevent the
entry of foreign material.
8. Engine Harness
Disconnect thermometer unit, thermo switch, ta-
chometer sensor and glow plug harness connec-
tors and separate harness from clips.
Legend
1. Fuel filter
2. Leak off
N6A0385E
N6A0386E
N6A0387E
N6A0388E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-17
9. Oil Level Guide Tube
Remove the guide tube fixing bolt and pull out the
guide tube.
10. Inlet Cover
11. Inlet Case
Remove the inlet case while removing the liquid
gasket.
Installation
1. Inlet Case
1) Apply 2 — 3 mm (0.08 — 0.12 in) bead of the
recommended liquid gasket (Three Bond
1207C) or its equivalent on the groove (1) of the
inlet case fitting surfaces shown in the illustra-
tion.
• Clean the inlet case fitting surface of the cylin-
der head.
2) Install the inlet case to the cylinder head.
• Install the inlet case within 7 minutes after ap-
plication of liquid gasket.
3) Tighten the inlet case to the specified torque.
Legend
1. Engine harness
N6A0389E
N6A0390E
Legend
1. Inlet cover
2. Inlet case
3. Gasket
N6A0391E
N6A0392E
6A3-18 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
Tighten:
Inlet case nuts and bolts to 19 N
⋅m (1.9 kg⋅m/ 14 lb⋅ft)
2. Inlet Cover
1) Attach harness clips ((1), (6) and (7)) and tight-
en the inlet cover bolts and nuts to the specified
torque in the numerical order shown in the illus-
tration.
2)
★ marks are located on the nut positions.
Tighten:
Inlet cover bolt and nut to 13 N
⋅m (1.3 kg⋅m/9 lb⋅ft)
3. Oil Level Guide Tube
1) Install the O-rings to the guide tube lower por-
tion and insert the guide tube completely to the
cylinder body.
2) Tighten the guide tube bolt to the specified
torque.
Tighten:
Guide tube bolt to 13 N
⋅m (1.3 kg⋅m/9.4 lb⋅ft)
4. Engine Harness
Connect thermometer unit, thermo switch, tachom-
eter sensor and glow plug harness connector and
fasten the engine harness with clips.
5. Injection Pipe
1) Install the injection pipe assembly and tempo-
rarily tighten the injection pipe sleeve nuts.
2) Set the clips in the prescribed position shown in
the illustration.
Caution:
Make absolutely sure that the clip is correctly positioned.
Legend
1. Inlet cover
2. Mounting rubber
3. Bolt
N6A1500E
N6A0393E
N6A0390E
N6A0395E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-19
An improperly positioned clip will result in injection pipe
breakage and fuel pulsing noise.
Tighten:
Clip screw to 3 N
⋅m (0.3 kg⋅m/26 lb⋅in)
3) Tighten the injection pipe sleeve nuts to the
specified torque.
Tighten:
Injection pipe sleeve nut to 29 N
⋅m (3 kg⋅m/22 lb⋅ft)
Injection Pipe (4HF1-2 model only)
1) Install the injection pipe assembly and tempo-
rarily tighten the injection pipe sleeve nuts.
2) Set the clips in the prescribed position shown in
the illustration.
Caution:
Make absolutely sure that the clip is correctly positioned.
An improperly positioned clip will result in injection pipe
breakage and fuel pulsing noise.
Tighten:
Clip screw to 3 N
⋅m (0.3 kg⋅m/26 lb⋅in)
3) Tighten the injection pipe sleeve nuts to the
specified torque.
Tighten:
Injection pipe sleeve nut to 29 N
⋅m (3 kg⋅m/22 lb⋅ft)
6. Positive Crankcase Ventilation (PCV) Hose
7. Fuel Pipe
Do not apply excessive force to the fuel pipe.
N6A1631E
Legend
1. Inlet cover
N6A1632E
N6A0387E
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