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)

—