Isuzu N-Series. Manual - part 355

6A3-72 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)

For 4HE1-TC

6. Engine Control Cable
7. Engine Control Lever Assembly

For 4HE1-TC

8. Oil Pipe
9. Fuel Return Hose

10. Fuel Feed Hose

Disconnect fuel hose from injection pump side and
take care not to spill and enter dust.

11. Nozzle Cover
12. Leak Off Pipe
13. Fuel Pipe
14. Positive Crankcase Ventilation (PCV) Hose
15. Water Bypass Hose
16. Injection Pipe
17. Injection Pump Assembly

Above works refer to “INJECTION PUMP ASSEM-
BLY” section in this manual.

18. Injection Pump Rubber Spacer (for 4HF1/4HG1-T)
19. Air Conditioning (A/C) Drive Belt (If equipped with

A/C)

N6A0526E

N6A0527E

N6A0425E

N6A0529E

ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-73

20. Idle Pulley Bracket (If equipped with A/C)

After removal of the A/C drive belt, remove the 3
bracket fixing bolts. Then, remove the bracket with
the tensioner and the idler attached.

21. Heater Hose
22. Radiator Lower Hose
23. Heater Pipe

24. Water Suction Pipe
25. Oil Cooler Assembly

1) Remove the oil cooler bolts.
2) Install a oil cooler fixing bolt to the oil cooler re-

place hole as shown in the illustration, and
tighten the bolt alternately a little at a time.

26. O-Ring

Disassembly

(Oil Cooler Assembly)

1. Element fixing bolts
2. Element
3. O-Ring

Reassembly

1. O-Ring

Apply a coat of engine oil to the O-rings and install
the O-rings the oil cooler.

2. Element

Legend

A. 4HF1-2

N6A0289E

N6A0290E

N6A0532E

N6A0533E

6A3-74 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)

3. Element fixing bolts

Tighten:
Element fixing bolts to 20 N

⋅m (2.0 kg⋅m/14 lb⋅ft)

Installation

1. O-Ring
2. Oil Cooler Assembly

1) Apply 2 — 3 mm (0.08 — 0.12 in) bead of the

recommended liquid gasket (Three Bond
1207C) or its equivalent on the oil cooler fitting
surface.

2) Apply a coat of engine oil to the O-rings (2 piec-

es) and install the O-rings to the oil cooler.

Notice:
Take care that the O-ring is not smeared with liquid gas-
ket.

• Install the oil cooler within 7 minutes after appli-

cation of liquid gasket.

• For the dislocation of liquid gasket, refer to the

illustration.

3) Tighten the oil cooler bolts and nut to the spec-

ified torque a little at a time in the sequence
shown in the illustration.

Tighten:
Oil cooler bolt and nut to 24 N

⋅m (2.4 kg⋅m/17 lb⋅ft)

3. Water Suction Pipe

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 of the
water suction pipe fitting surface.

2) Install the water suction pipe to the oil cooler.

• For the dislocation of liquid gasket, refer to the

illustration.

Legend

2. Element
3. O-ring

N6A0533E

Legend

1. O-ring
2. Liquid gasket

N6A1626E

N6A0320E

ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-75

Tighten:
Water suction pipe bolt to 24 N

⋅m (2.4 kg⋅m/17 lb⋅ft)

Notice:
Install the water suction pipe immediately after the in-
stallation of the oil cooler.

4. Heater Pipe

1) Install the O-ring to the heater pipe.
2) Install the heater pipe to the oil cooler.

Tighten:
Heater pipe bolt to 24 N

⋅m (2.4 kg⋅m/17 lb⋅ft)

5. Radiator Lower Hose
6. Heater Hose

7. Idle Pulley Bracket (If equipped with A/C)

Tighten:
Idle pulley bracket bolt to 48 N

⋅m (4.9 kg⋅m/35 lb⋅ft)

Legend

1. Liquid gasket

N6A1627E

N6A0322E

Legend

A. 4HF1-2

Legend

1. Mark

N6A0290E

N6A1636E