Isuzu N-Series. Manual - part 621

6C-54 ENGINE FUEL

INJECTION PUMP DATA

Test Conditions

Notice:
′91/542A; Euro 1
′91/542B; Euro 2

Items

Conditions

Engine Type

4JB1 (Gear)

4JG2 (Belt)

(For 

′91/542B)

Euro 2

4JB1 (Gear)

(For 

′91/542A)

Euro 1

Injection Nozzle

ZEXEL Part Number

105780-0000

105780-0000

Bosch Type Number

DN12SD12T

DN12SD12

Injection Nozzle holder

ZEXEL Part Number

105780-2080

105780-2080

Bosch Type Number

EF8511/9

EF8511/9

Injection Nozzle Opening Pressure

MPa (kg/cm

2

/psi)

14.7 (150 / 2,133)

13.0 (133 / 1,891)

Injection Line di-
mensions

mm (in)

Inside Diameter

2 (0.079)

Outside Diameter

6 (0.236)

Length

840 (33.1)

450 (17.7)

Fuel delivery Pres-
sure 

kPa (kg/cm

2

/psi)

20 (0.2 / 2.84)

Test Fuel

SAE Standard Test Diesel Fuel (SAE967D)

ISO Standard Test Diesel Fuel (ISO4113) 

Test Fuel Tempera-
ture

°C(°F)

48 - 52 (118-126)

Identification Numbers

104746-1230

196000-1042

104742-1451

104746-1240

104742-1461

104746-1250

104742-1471

104746-1260

104742-1480

104746-1270

104742-1490

104746-1280

104746-1290

104746-1370

ENGINE FUEL 6C-55

Notice:
′91/542A ; Euro 1
′91/542B ; Euro 2

Items

Conditions

Engine Type

4JB1-TC

Injection Nozzle

ZEXEL Part Number

105780-0060

Bosch Type Number

Injection Nozzle holder

ZEXEL Part Number

105780-2150

Bosch Type Number

—

Injection Nozzle

MPa (kg/cm

2

/psi)

13.0 (133 / 1,891)

Opening Pressure

Injection Line di-
mensions

mm (in)

Inside Diameter

2 (0.079)

Outside Diameter

6 (0.236)

Length

450 (17.7)

Fuel delivery Pres-
sure 

kPa (kg/cm

2

/psi)

20 (0.2 / 2.84)

Test Fuel

SAE Standard Test Diesel Fuel (SAE967D)

ISO Standard Test Diesel Fuel (ISO4113) 

Test Fuel Tempera-
ture

°C(°F)

48 — 52 (118 — 126)

Identification Numbers

104746-6601

104766-6620

6C-56 ENGINE FUEL

Identification Plate and Number

Use the data following the injection pump identification
number to adjust the injection volume.

N6A3462E

N6A3463E

N6A3464E

ENGINE FUEL 6C-57

INJECTION VOLUME AND GOVERNOR PERFORMANCE DIAGRAM

Governor Performance Diagram

Engine ; 4JB1
Injection pump assembly No. ;
8943616830 (104741-6410)
8943616850 (104741-6430)
Adjustment specification of injection volume

Adjustment specification of timer and pump case pressure

Pump rotation

(rpm)

Average injection 

quantity

(mm

3

/ST)

Uneven amplitude

(mm

3

/ST)

Oil temperature

(

°C)

Remarks

500

(38.6)

—

48

±2

700

34.9

±2.5

—

50

±2

1000

42.1

±1.0

4.0

50

±2

Standard

1450

44.5

±2.5

—

50

±2

1800

47.6

±3.0

—

60

±2

2100

12.9

±3.0

4.0

52

±2

390

6.7

±3.0

2.0

48

±2

100

60 -100

—

48

±2

N6A3465E

Pump rotation

(rpm)

Timer piston stroke (mm)

Air pressure of pump

(kPa (kg/cm

2

))

Remarks

Solenoid timer

Solenoid timer

ON

OFF

ON

OFF

700

Over 0.5

—

—

—

1300

—

1.4

±0.4

—

—

1600

—

3.9

±2

—

490

±20 

(5.0

±0.2)

Standard

1950

—

7.0 

+ 0.4

-0.3

—

—