Isuzu N-Series. Service 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
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