Isuzu N-Series. Manual - part 623

6C-62 ENGINE FUEL

Engine ; 4JB1 (For 

′91/542A) (Gear drive)

Injection pump identification No. ; 104742-1451, 1461, 1471
Adjustment specification of injection volume

N6A3470E

Pump rotation

(rpm)

Average injection 

quantity

(mm

3

/ST)

Uneven amplitude

(mm

3

/ST)

Oil temperature

(

°C)

Remarks

500

(29.7

±4.5)

—

48

±2

1000

(46.4

±3.5)

—

50

±2

1150

47.6

±1.0

3.5

50

±2

Standard

1800

(55.5 

+0.4

-6.0

)

—

50

±2

2100

14.9

±3.0

4.0

52

±2

Standard

375

7.3

±2.0

2.0

48

±2

Standard

N6A3471E

ENGINE FUEL 6C-63

Adjustment specification of timer and pump case pressure

Adjustment specification of aneroid compensator (For 104742-1471)

Pump rotation

(rpm)

Timer piston stroke

(mm)

At of pressure pump

(MPa(kg/cm

2

))

Remarks

Solenoid timer

Solenoid timer

ON

OFF

ON

OFF

700

Over 0.5

—

—

—

1400

—

1.5

±0.4

—

—

1600

—

3.0

±0.2

—

0.53

±0.02

(5.4

±0.2)

Standard

2100

—

5.7 

+0.4

-0.3

—

—

N6A3617E

Pump rotation

(rpm)

Altitude

(m)

Air pressure differ-

ence

(kPa (mmHg))

Amount of reduction

(mm

3

/ST)

Rate of reduction

(%)

1150

0

0

0

0

(500)

−5.9±3.3

(

−44±25)

Inflation point

Inflation point

2000

−21.9

(

−164)

(

−5.2±1.3)

(

−11±3)

6C-64 ENGINE FUEL

Engine ; 4JB1 (For 

′91/542A) (Gear drive)

Injection pump identification No. ; 104742-1480, 1490
Adjustment specification of injection volume

N6A3470E

Pump rotation

(rpm)

Average injection 

quantity

(mm

3

/ST)

Uneven amplitude

(mm

3

/ST)

Oil temperature

(

°C)

Remarks

500

(29.7

±4.5)

—

48

±2

1000

(46.4

±3.5)

—

50

±2

1150

47.6

±1.0

3.5

50

±2

Standard

1800

(55.5 

+0.4

-6.0

)

—

50

±2

2100

14.9

±3.0

4.0

52

±2

Standard

375

7.3

±2.0

2.0

48

±2

Standard

100

(60 -100)

—

48

±2

N6A3471E

ENGINE FUEL 6C-65

Adjustment specification of timer and pump case pressure

Pump rotation

(rpm)

Timer piston stroke (mm)

At pressure of pump

(MPa (kg/cm

2

))

Remarks

1400

(1.5

±0.4)

—

1600

3.0

±0.2

0.53

±0.02

(5.4

±0.2)

Standard

2100

5.7 

+0.4

-0.3

—

N6A3619E

N6A3470E