Isuzu N-Series. Manual — part 388

6C-30 FUEL SYSTEM

Final Inspection

1. Remove the dial gauge (1), nut (2) and dial gauge

holder (3).

2. Remove the adjustment retaining nut and gasket.
3. Install the original retaining nut, confirm that the

pins are inserted fully into the nozzle, and then
hand-tighten the retaining nut. Then, tighten the
original retaining nut to the specified torque.
Torque: 29 — 39 N

⋅m (3.0 — 4.0 kg⋅m / 22 — 29

lb

⋅ft)

4. Set the nozzle holder (1) to the nozzle tester (2)

and check first nozzle opening pressure, spray

condition, seat oil tightness and each part for oil
leaks.

5. When replacing the nozzle, replace the nozzle, lift

piece, pins and spacer as a set with the nozzle ser-
vice kit.

Caution:
Pre-lift will not be as specified if only the nozzle is re-
placed.

Installation

1. Injection Nozzle Assembly

1) Install a new injection nozzle (1) gasket and O-

ring (2) to the nozzle holder, and then install the
nozzle holder to the cylinder head as shown in
the illustration.

2) Tighten the nozzle holder flange nuts to the

specified torque in the numerical order.

Tighten:
Nozzle holder flange nuts to 19 N

⋅m (1.9 kg⋅m / 14 lb⋅ft)

Legend

1. Thickness

Legend

1. Torque wrench
2. Retaining nut (special tool)

N6A0886E

N6A0866E

N6A0867E

N6A0889E

FUEL SYSTEM 6C-31

2. Fuel 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.
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)

3. Fuel Injection Pipe (4HF1-2 model only)

1) Connect Injection Pipe and fix with clips as il-

lustrated.

Tighten:

• Injection pipe to 29 N

⋅m (3.0 kg⋅m / 22 lb⋅ft)

• Clip to 3 N

⋅m (0.3 kg⋅m / 26 lb⋅in)

N6A0115E

N6A1631E

6C-32 FUEL SYSTEM

4. Leak Off Pipe

Leak-off pipe joint bolt 13 N

⋅m (1.3 kg⋅m / 113 lb⋅in)

5. Nozzle Cover

• Connect battery ground cable.

N6A1632E

N6A0893E

FUEL SYSTEM 6C-33

INJECTION PUMP ASSEMBLY (Except 4HF1-2 model)

Component

Removal

Preparation

• Disconnect the battery ground cable
• Drain coolant

1. Intake Air Duct
2. Vacuum Hose
3. Oil Level Guide Tube

• Remove the guide tube fixing bolt and pull out

the guide tube.

Legend

1. Intake air duct

10. Fuel feed hose

2. Vacuum hose

11. Nozzle cover

3. Oil level guide tube

12. Leak off pipe

4. Engine stop cable

13. Fuel pipe

5. Accelerator control cable

14. Fuel filter assembly

6. Engine control wire

15. PCV hose

7. Engine control lever

16. Injection pipe

8. Oil pipe

17. Injection pump assembly

9. Fuel return hose

18. Injection rubber spacer

N6A0894E