Isuzu N-Series. Manual — part 394
6C-54 FUEL SYSTEM
Injection Volume Adjustment (4HF1-2 Engine)
Test Conditions
4HF1-2 (Bosch distributor type)
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.: 105118-4680
Injection nozzle
Bosch AS Part No.: 105017-2200
Nozzle holder
Bosch AS Part No.: 105048-3673
Injection nozzle opening pressure
kPa (kg/cm
2
/ psi)
13,042 (133 / 1,891)
Injection line dimensions
Inside diameter
mm (in)
2.0 (0.079)
Outside diameter
mm (in)
6.0 (0.236)
Length
mm (in)
450 (17.7)
Fuel delivery pressure
kPa (kg/cm
2
/ psi)
19.6 (0.2 / 2.84)
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
101742-1630
Legend
A. Isuzu part No. (Pump assembly No.)
B. Bosch pump assembly No.
N6A0946E
FUEL SYSTEM 6C-55
Injection Volume and Governor Performance Diagram
Injection volume
Timing Advance Specification
Governor Adjustment (4HF1-2)
Identification Numbers
: 104742-1630
[4HF1-2 Engine]
Pre-stroke
: No. 1 plunger 0.45
±0.05 mm (0.0177±0.0020 in)
Injection order
: 1 — 3 — 4 — 2 (interval 90
°±30′) Plungers are numbered from the Governor side
Pump speed (rpm)
Injection volume
(mm
3
/strokes)
Uneven amplitude
(mm
3
/strokes)
Oil temperature
(
°C (°F))
Remarks
500
48.2
± 4.5
—
48
±2 (118±36)
960
60.3
±1.0
5.0
50
±2 (122±36)
Basic
1280
63.9
±3.5
—
50
±2 (122±36)
1600
61.4
±4.5
—
50
±2 (122±36)
1925
17.9
±3.0
5.5
50
±2 (122±36)
Basic
300
10.1
±2.0
2.0
48
±2 (118±36)
Basic
150
37.0
±10
—
48
±2 (118±36)
Pump Speed (r.p.m.)
1,100
1,280
1,600
1,800
Degree for Angle of Lead (deg.)
0.7
2.8
6.2
Finish 6.5
N6A1656E
6C-56 FUEL SYSTEM
Injection Volume Adjustment (4HG1 Engine)
Test Conditions
4HG1 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.: 105118-6041
Injection nozzle
Bosch AS Part No.: 105017-1850
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)
600 (23.6)
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
101401-7430
101401-7440
Legend
A. Isuzu part No. (Pump assembly No.)
B. Bosch pump assembly No.
N6A0946E
FUEL SYSTEM 6C-57
Injection Volume and Governor Performance Diagram
Injection Volume
Timing Advance Specification
Identification Numbers
: 101401-7430/101401-7440
[4HG1 Engine]
Pre-stroke
: No. 1 plunger 4.1
±0.05 mm (0.1614±0.0020 in)
Injection order
: 1 — 3 — 4 — 2 (interval 90
°±30′) Plungers are numbered from the Governor side
Tappet clearance
: Bolt adjustment type
: More than 0.3 mm (0.0118 in) for all cylinders.
: Shim adjustment type
: Manually rotate the camshaft 2 — 3 times and confirm that it
rotates smoothly.
Adjusting point
Pump speed (r.p.m.)
Injection volume (cc/
1000 strokes)
Variance (%)
Remarks
1,310
70.5
±1.6
±4
Basic
H
315
10
±1.3
±10.0
A
1,310
70.5
±1
—
Basic
B
1,600
(75.5)
±2
—
C
520
(64)
±2
—
D
960
(70.5)
+2
−0
—
I
150
(95)
+16
−0
—
Pump Speed (r.p.m.)
1,050 or less
1,000
1,600 or more
Degree for Angle of Lead (deg.)
Start
0.5 or less
Finish 5
±0.5
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