Isuzu N-Series. Manual - part 352

6A3-60 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)

11. Intake Air Duct

Engine Right Side

1. Air Conditioning (A/C) Compressor (If equipped

with A/C)
Tighten fixing bolts to the specified to 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 first
the 2 bolts on the rear side, and then the remaining 2 on
the front side.

2. A/C Compressor Drive Belt (If equipped with A/C)

1) Install drive belt adjust belt tension by adjusting

bolt and tighten locking nut to the specified
torque.

2) 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)

3. 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)

• Connect the negative battery cable.
• Lower the cab.
• Start engine and check for oil, fuel and water

leakage carefully.

Drive Belt Deflection

mm (in)

16 — 20 (0.63 — 0.79) ... New belt

18 — 22 (0.71 — 0.87) ... Reuse belt

N6A0417E

Legend

1. Belt deflection

N6A0418E

ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-61

CIRCUMFERENCE PARTS OF CYLINDER HEAD

Component

Removal

Preparation

• Disconnect battery ground cable
• Tilt the cab
• Drain coolant

• Remove each part from the cylinder head assem-

bly. 
For details, refer to the “CYLINDER HEAD” in this
section.

1. Inlet Cover/Inlet Case
2. Air Conditioning (A/C) Compressor Bracket (If

equipped with A/C)

Legend

1. Inlet cover/inlet case

8. Idle gear C cover

2. A/C compressor bracket (If equipped with A/C)

9. Idle gear C

3. Heat protector

10. Glow plug

4. Exhaust manifold

11. Fuel filter bracket

5. Exhaust gasket

12. Engine hanger

6. Water outlet pipe

13. Turbocharger

7. Idle gear C cover

N6A0499E

6A3-62 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)

3. Heat Protector
4. Exhaust Manifold
5. Exhaust Gasket
6. Water Outlet Pipe
7. Thermostat
8. Idle Gear C Cover

Tap the outside of the sealing cup with a screwdriv-
er (1) to deform one end of it and draw it out with
pliers.

9. Idle Gear C

10. Glow Plug
11. Fuel Filter Bracket
12. Engine Hanger

Installation

1. Engine Hanger
2. Fuel Filter Bracket

Tighten:
Fuel filter bracket bolt to 104 N

⋅m (10.6 kg⋅m/77 lb⋅ft)

3. Glow Plug

Tighten:
Glow plug to 23 N

⋅m (2.3 kg⋅m/17 lb⋅ft)

4. Idle Gear C

1) Apply engine oil to the idle gear shaft, bushing

and idle gear before installation.

2) Install the idle gear with the boss side facing to

the camshaft as shown in the illustration.

Tighten:
Idle gear C bolt to 95 N

⋅m (9.7 kg⋅m/70 lb⋅ft)

N6A0416E

N6A0501E

Legend

1. Fuel filter bracket
2. Engine hanger

N6A0502E

ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-63

5. Idle Gear C Cover

1) Apply the recommended liquid gasket (LOC-

TITE 262) or its equivalent to the outside of the
sealing cup and install it to the cylinder head.

2) Use the sealing cup installer and a hammer to

drive the sealing cup into position from the cyl-
inder head side as shown in the illustration.
Sealing Cup Installer: 5-8840-2222-0

6. Thermostat

Install the gaskets to the thermostat and install
them to the cylinder head as shown in the illustra-
tion.

7. Water Outlet Pipe

Tighten:
Water outlet pipe bolt to 24 N

⋅m (2.4 kg⋅m/17 lb⋅ft)

8. Exhaust Gasket

Insert the gasket into the stud provided to the cyl-
inder head (with the projection (1) of the gasket on
this side).

N6A0503E

N6A1634E

Legend

1. Gasket
2. Top face of the head

N6A0505E

N6A1635E