Isuzu N-Series. Service manual - part 340

6A3-12 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)

Installation

1. Engine Mount

Tighten the fixing bolts to the specified torque.

Tighten:
Chassis frame side bolt to 48 N

⋅m (4.9 kg⋅m/35 lb⋅ft)

Tighten:
Engine foot side nut to 82 N

⋅m (8.4 kg⋅m/61 lb⋅ft)

2. Fan Guide
3. Transmission Panel

1) Connect the negative battery cable.
2) Lower the cab
3) Start the engine, and check for any abnormal

conditions with the engine mount.

ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-13

CYLINDER HEAD COVER

Component

Removal

Preparation

• Disconnect battery ground cable.
• Tilt the cab.

1. Nozzle Cover
2. Cylinder Head Cover
3. Cylinder Head Cover Gasket
4. Rubber Plug

Installation

1. Rubber Plug

1) Apply a 3 — 4 mm (0.12 — 0.16 in) bead of the

recommended liquid gasket (Three Bond
1207B) or its equivalent to the cylinder head
front and rear plug arch.

2) Install the rubber plugs to the cylinder head up-

per faces.

3) Apply a 3 — 4 mm (0.12 — 0.16 in) bead of the

recommended liquid gasket (Three Bond
1207B) or its equivalent to the rubber plugs and
cylinder head upper faces. Refer to arrows in
the illustration.

Legend

1. Nozzle cover

3. Cylinder head cover gasket

2. Cylinder head cover

4. Rubber plug

N6A0381E

6A3-14 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)

Install the cylinder head cover within 7 minutes af-
ter application of liquid gasket.

2. Cylinder Head Cover Gasket

Install the gasket to the cylinder head cover.

3. Cylinder Head Cover

1) Install the cylinder head cover.
2) Tighten the cylinder head cover nuts and bolts

to the specified torque in the numerical order
shown in the illustration.

Tighten:
Cylinder head cover nut and bolt to 18 N

⋅m (1.8 kg⋅m/13

lb

⋅ft)

4. Nozzle Cover

• Connect the negative battery cable.
• Lower the cab.
• Start engine and check for oil leakage carefully.

N6A1630E

Legend

1. Mounting rubber
2. Nut
3. Bolt
4. Stud
5. Gasket
6. Head cover

N6A0383E

ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-15

INLET COVER / INLET CASE

Component

For 4HF1

Removal

Preparation

• Disconnect battery ground cable.
• Tilt the cab.

1. Intake Air Duct

1) Remove the clips at the connections with the in-

let cover and with the air cleaner.

2) Remove the intake air duct with the connector

hose attached.

2. Vacuum Hose
3. Nozzle Cover

Legend

1. Intake air duct

7. Injection pipe

2. Vacuum hose

8. Engine harness

3. Nozzle cover

9. Oil level guide tube

4. Leak off pipe

10. Inlet cover

5. Fuel pipe

11. Inlet case

6. PCV hose

N6A0384E