Isuzu N-Series. Manual — part 396
6C-62 FUEL SYSTEM
Injection Volume Adjustment (4HE1-TC Engine)
Test Conditions
4HE1-TC 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.: 105118-6462
Injection nozzle
Bosch AS Part No.: 105017-2181
Nozzle holder
Bosch AS Part No.: 105048-4510
Injection nozzle opening pressure
kPa (kg/cm
2
/ psi)
18,142 (185 / 2,631)
Injection line dimensions
Inside diameter
mm (in)
3.0 (0.118)
Outside diameter
mm (in)
8.0 (0.315)
Length
mm (in)
600 (23.6)
Fuel delivery pressure
kPa (kg/cm
2
/ psi)
254.9 (2.6 / 36.97)
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
107492-1023
107492-1062
107492-1032
107492-1100
107492-1110
107492-1120
107492-1130
897212-9351 (ISUZU NO.)
Legend
A. Isuzu part No. (Pump assembly No.)
B. Bosch pump assembly No.
N6A0946E
FUEL SYSTEM 6C-63
Injection Volume and Governor Performance Diagram
Injection Volume
Identification Numbers
: 107492-1110
[4HE1-TC Engine]
Pre-stroke
: No. 1 plunger 4.0
±0.03 mm (0.1575±0.0012 in)
Injection order
: 1 — 3 — 4 — 2 (interval 90
°±15′) 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
1,000
82.5
±1.6
±4
Basic
H
400
19
±1.5
±14
Z
500
—
—
A
1,000
82.5
±1
—
Basic
B
1,450
92.5
±2
—
C
500
67
—
D
1,450
89.5
—
I
150
220
—
6C-64 FUEL SYSTEM
Governor Adjustment
N6A1658E
FUEL SYSTEM 6C-65
Injection Volume and Governor Performance Diagram
Injection Volume
Identification Numbers
: 107492-1023 / 107492-1100
[4HE1-TC Engine]
Pre-stroke
: No. 1 plunger 4.0
±0.03 mm (0.1575±0.0012 in)
Injection order
: 1 — 3 — 4 — 2 (interval 90
°±15′) 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
1,000
107.5
±1.6
±4
Basic
H
400
22
±1.5
±10.0
Z
510
—
—
Basic
A
1,000
107.5
±1
—
B
1,200
112.5
±2
—
C
500
(78)
—
D
1,200
(103)
—
I
150
(235)
—
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