Isuzu N-Series. Service manual — part 390
6C-38 FUEL SYSTEM
7) Adjust injection pump downward so that the
“8
°” (98EPA) or “9°” (Spec EURO3) comes to
position in the timing check hole. (for 4HE1-TC
only)
Notice:
Whenever the injection pump is replaced, be sure to ad-
just the injection timing. For the details of the adjust-
ment, refer to the “SECTION 00 SERVICING:
INJECTION TIMING INSPECTION AND ADJUST-
MENT”.
8) Tighten the injection pump bracket nuts and
bolts to the specified torque.
Tighten:
Injection pump bracket nut and bolt to 48 N
⋅m (4.9 kg⋅m
/ 35 lb
⋅ft)
9) Install the injection pump rear bracket.
Tighten:
Injection pump rear bracket bolt to 48 N
⋅m (4.9 kg⋅m / 35
lb
⋅ft)
10) Install the inspection hole plug.
Tighten:
Inspection hole plug to 48 N
⋅m (4.9 kg⋅m / 35 lb⋅ft)
Notice:
In case the crank pulley has two marks as illustrated, (1)
BTDC 49
° mark on the second crest and (2) TDC mark
on the third crest (as viewed from the front side), be sure
to set at the mark (2). (If there are two different marks on
one and same crest, set at the mark which comes sec-
ond when rotated in the normal direction.) The mark (1)
is used when installing the injection pump for 4HF1-2.
Legend
1. TDC
Legend
1. 8
° mark
2. Pointer
3. 13
° mark
4. Timing check hole
N6A0910E
N6A0911E
N6A0912E
FUEL SYSTEM 6C-39
3. 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)
4. PCV Hose
5. Fuel Filter
Tighten:
Fuel filter bracket bolt to 34 N
⋅m (3.5 kg⋅m / 25 lb⋅ft)
6. Fuel Pipe
7. Leak Off Pipe
8. Nozzle Cover
9. Fuel Feed Hose
10. Fuel Return Hose
11. Oil Pipe
12. Engine Control Lever
13. Engine Control Wire
14. Accelerator Control Cable
15. Engine Stop Cable
16. Oil Level Guide Tube
17. Vacuum Hose
18. Intake Air Duct
Legend
A. 4HG1-T
N6A0055E
N6A1654E
6C-40 FUEL SYSTEM
INJECTION PUMP ASSEMBLY (4HF1-2 model only)
Component
Installation
1. Turn the crankshaft to set No. 1 cylinder to 49
° be-
fore TDC in its compression stroke. (49
° is a pump
assembling angle, not related to injection timing.)
2. Install O-ring to the injection pump.
3. Apply paint on the
• (Z) marked side of the injection
pump gear.
4. Align the pump bracket mark with the tooth (under
side of the pump) just before the
• (Z) marked
tooth.
5. Insert the pump using the block side of stud bolt as
a guide.
6. After installing the injection pump, remove the ta-
chometer sensor from the housing, and make sure
N6A0915E
N6A0916E
N6A0335E
FUEL SYSTEM 6C-41
that the painted gear is at the center of the sensor
mounting hole.
7. Tighten injection pump clamping bolt and nut to
specified torque:
Tighten:
• Bolt to 48 N
⋅m (4.9 kg⋅m / 35 lb⋅ft)
• Nut to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
8. With reference to Injection Timing Check & Adjust-
ment, set No. 1 Cylinder to 12
° before its TDC.
Notice:
In case the crank pulley has two marks as illustrated, (1)
BTDC 49
° mark on the second crest and TDC mark on
the third crest (as viewed from the front side), be sure to
set at the mark (2). (If there are two different marks on
one and same crest, set at the mark which comes sec-
ond when rotated in the normal direction.)
9. 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)
10. Fuel Pipe
Do not apply excessive force to the fuel pipe.
Tighten:
• Fuel pipe joint bolt (1) to 41 N
⋅m (4.2 kg⋅m / 30 lb⋅ft)
• Fuel pipe joint bolt (2) to 23 N
⋅m (2.3 kg⋅m / 17 lb⋅ft)
• Clip screw to 4 N
⋅m (0.4 kg⋅m / 35 lb⋅in)
N6A0918E
N6A0055E
N6A1632E
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