Isuzu N-Series. Service manual — part 395
6C-58 FUEL SYSTEM
Governor Adjustment
N6A1657E
FUEL SYSTEM 6C-59
Injection Volume Adjustment (4HG1-T Engine)
Test Conditions
4HG1-T 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.: 105118-7542
Injection nozzle
Bosch AS Part No.: 105019-1470
Nozzle holder
Bosch AS Part No.: 105048-3832
Injection nozzle opening pressure
kPa (kg/cm
2
/ psi)
18,044 (184 / 2,616)
Injection line dimensions
Inside diameter
mm (in)
2.2 (0.079)
Outside diameter
mm (in)
6.0 (0.236)
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
101401-7452
Legend
A. Isuzu part No. (Pump assembly No.)
B. Bosch pump assembly No.
N6A0946E
6C-60 FUEL SYSTEM
Injection Volume and Governor Performance Diagram
Injection Volume
Timing Advance Specification
Identification Numbers
: 101401-7452
[4HG1-T Engine]
Pre-stroke
: No. 1 plunger 3.8
±0.05 mm (0.1496±0.0020 in)
Injection order
: 1 — 3 — 4 — 2 (interval 90
°±30′) Plungers are numbered from the Governor side
Tappet clearance
: Shim adjustment type
: Manually rotate the camshaft 2 — 3 times and confirm that it
rotates smoothly.
: Bolt adjustment type
: More than 0.3 mm (0.0118 in) for all cylinders.
Adjusting
point
Rack Posi-
tion
(mm (in))
Pump
Speed
(rpm)
Injection q’ty (cm
3
/
1000strokes)
Max var
bet. cyl.
(%)
Fixed
Remarks
11.5
(0.4528)
1000
73.5
±1.6
±4
Rack
Basic
H
Approx. 8.9
(0.3504)
315
(Measure)
±1.3
±10
Rack
A
R1 (11.5
(0.4528))
1000
73.5
±1
—
Lever
Basic Boost press. kPa (mmHg/
psi)
Above 62.0 (465/8.99)
B
R1 +1.0
(0.0394)
1500
(78.5)
±2
—
Lever
Lever Boost press. kPa (mmHg/
psi)
Above 62.0 (465/8.99)
C
R2 -0.8
(0.0315)
500
(66.5)
±2
—
Lever
Boost press.
0
I
—
150
(Measure)
±16
—
Lever
Boost press.
0
Confirm that the timing of is
advanced 1
°±30′ from A.
Pump speed (rpm)
Below (N1 + 50)
N1
N3
Advance angle (
°)
Start
Below 0.5
Finish 4.0
±0.5
FUEL SYSTEM 6C-61
Governor Adjustment (4HG1-T)
N6A0955E
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