Isuzu N-Series. Service manual - part 622

6C-58 ENGINE FUEL

Adjustment specification of aneroid compensator

N6A3466E

Pump rotation

(rpm)

Altitude

(m)

Air pressure 

difference

(kPa (mmHg))

Amount of reduction

(mm

3

/ST)

Rate of reduction

(%)

1000

0

0

0

0

(500)

-5.9

±3.3

(-44

±3)

Inflation point

Inflation point

2000

-21.9

(-164)

-4.6

±1

-11

±3

N6A3467E

ENGINE FUEL 6C-59

Engine ; 4JB1 
Injection pump identification No. ; 104746-1230, 1240, 1250, 1260, 1280, 1290, 1370 
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

—

50

±2

2100

12.9

±3.0

4.0

52

±2

390

6.7

±2.0

2.0

48

±2

100

60 -100

—

48

±2

N6A3468E

Pump rotation

(rpm)

Timer piston stroke

(mm)

At pressure of pump

(MPa(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

—

0.49

±0.02

(5.0

±0.2)

Standard

1950

—

7.0

+ 0.4 

-0.3

—

—

6C-60 ENGINE FUEL

Adjustment specification of aneroid compensator (For 104746-1230,14746- 1280)

N6A3469E

Pump rotation

(rpm)

Altitude

(m)

Air pressure 

difference

(kPa (mmHg))

Amount of reduction

(mm

3

/ST)

Rate of reduction

(%)

1000

0

0

0

0

(500)

-5.9

±3.3

(-44

±25)

Inflation point

Inflation point

2000

-21.9

(-164)

-4.6

±1

-11

±3

N6A3470E

ENGINE FUEL 6C-61

Engine ; 4JG2 (For 

′91/542B) (Belt drive)

Injection pump assembly No. ; 897138-8422 (196000-1042)
Adjustment specification of injection volume

Pump rotation

(rpm)

Average injection quantity

(mm

3

/ST)

Uneven amplitude

(mm

3

/ST)

Remarks

100

78

±12

—

350

64

±6.0

—

500

52

±3.0

—

720

55.9

±3.4

—

1000

62.6

±1.0

4.0

1250

60.9

±3.5

—

1700

574

±3.5

4.0

2100

13

±5.0

—

2250

Below 5.0

—

360

15.9

±3.0

2.5

550

Below 3.0

—

N6A3752E

N6A3753E

N6A3754E

N6A3755E