Isuzu N-Series. Service manual — part 392
6C-46 FUEL SYSTEM
5. Tighten the injection pump fixing nuts (1) to the
specified torque.
Tighten:
Injection pump fixing nut to 25 N
⋅m (2.6 kg⋅m / 19 lb⋅ft)
Notice:
If there are two marks on the crank pulley, the front side
of mark is for setting BTDC 49
° and the rear side of mark
is for setting TDC.
Injection Timing Check (4HF1-2 model
only)
1. Set No. 1 Cylinder to the TDC in the compression
stroke.
2. Disconnect Injection Pipe.
3. Put down Wax CSD lever, insert a spacer 10 — 12
mm (0.39 — 0.47 in) thick between the plunger and
adjust bolt, and cancel the Wax CSD.
4. Remove the pump rear plug, connect a dial gage
and set the lift at 1 mm (0.039 in).
Special Tool
Measuring device: 5-9940-0145-0
5. Set the crankshaft damper pulley TDC mark to the
pointer or 45
° before TDC.
N6A0936E
N6A0937E
Legend
1. Lever
2. Spacer
3. Water hose
4. Wax CSD
N6A0939E
N6A0940E
FUEL SYSTEM 6C-47
6. Set the dial gage to the “0” position.
7. Turn the crankshaft leftwise and rightwise a little
and make sure that the needle stays in the “0” po-
sition.
8. Turn the crankshaft in the normal direction and
read the measuring device’s indication at the 12
°
before TDC position.
Notice:
As there is no 12
° mark, set midway between the 11°
and 13
° marks.
Standard value: 0.5 mm (0.0197 in)
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.
Injection Timing Adjustment (4HF1-2 model
only)
If injection timing is out of the specified range, follow the
following procedure for adjustment:
1. Loosen injection pump fixing nuts (1) and bracket
bolt (2).
2. Adjust the mounting angle of injection pump:
• If injection timing is too fast, bring the injection
pump closer to the engine.
• If injection timing is too slow, put the injection
pump more distant from the engine.
3. When the dial gage has indicated the specified val-
ue, tighten the fixing nuts and bolt to specified
torque.
Tighten:
• Nut to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
• Bolt to 48 N
⋅m (4.9 kg⋅m / 35 lb⋅ft)
N6A0941E
N6A0933E
N6A0055E
N6A0944E
6C-48 FUEL SYSTEM
4. Disconnect the dial gage, install and tighten the
plug to specified torque. (Make sure of a coper
washer being attached to the plug)
Tighten:
Plug to 17 N
⋅m (1.7 kg⋅m / 12 lb⋅ft)
5. Release the wax CSD and connect the injection
pipe.
Tighten:
Pipe sleeve nut to 29 N
⋅m (3.0 kg⋅m / 22 lb⋅ft)
Idling Speed Adjustment (Except 4HF1-2
model)
1. Idling Rotation Check
1) Idle the engine.
2) Measure the number of the idling rotations with
a tachometer.
3) When the number of the idling rotations is out-
side the specified value, adjust it with the idling
adjust bolt (arrow-marked).
Number of idling rotations:
550 — 600 rpm
(4HE1-TC)
775 — 825 rpm
Idling Speed Check & Adjustment (4HF1-2
model only)
1. Warm up the engine.
2. Measure idling speed by means of tachometer.
3. If idling speed is out of the standard, adjust with an
idling adjust bolt (indicated by arrow mark).
Idling speed: 575 — 625 rpm
N6A0938E
N6A0945E
FUEL SYSTEM 6C-49
INJECTION PUMP DATA
Injection Volume Adjustment (4HF1 Engine)
Test Conditions
4HF1 Engine
Identification Plate and Number
Use the data following the injection pump identification
number to adjust the injection volume.
Item
Condition
Injection nozzle and holder assembly
Bosch AS Part No.: 105118-6051
Injection nozzle
Bosch AS Part No.: 105017-1860
Nozzle holder
Bosch AS Part No.: 105048-3673
Injection nozzle opening pressure
kPa (kg/cm
2
/ psi)
18,142 (185 / 2,631)
Injection line dimensions
Inside diameter
mm (in)
2.0 (0.079)
Outside diameter
mm (in)
6.0 (0.236)
Length
mm (in)
500 (19.7)
Fuel delivery pressure
kPa (kg/cm
2
/ psi)
156.9 (1.6 / 22.75)
Test fuel
SAE Standard Test Diesel Fuel (SAE J967d)
ISO Standard Test Diesel Fuel (ISO 4113)
Test fuel temperature
°C (°F)
40 — 45 (104 — 113)
Identification numbers
101401-7070
101401-7060
101401-7090
101401-7311
Legend
A. Isuzu part No. (Pump assembly No.)
B. Bosch pump assembly No.
N6A0946E
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