Isuzu engine 4j series. Manual - part 77

6C - 52  ENGINE FUEL

Timer adjustment

Adjustment specification of timer and
pump case pressure

Timer

piston

stroke (mm)

At pressure

of pump

(MPa (kg/cm

2

))

Solenoid timer

Solenoid timer

Pump

rotation

(rpm)

ON

OFF

ON

OFF

Boost

Pressure

kPa

(kg/cm

2

)

Remarks

750

Over 0.5

—

—

—

72.0 (0.73)

1600

—

1.8±0.4

—

—

72.0 (0.73)

1900

—

3.7±0.2

—

618

(6.3±0.2)

72.0 (0.73) Standard

2400

—

7.0

—

—

72.0 (0.73)

Adjustment specification of injection
volume

Pump

rotation

(rpm)

Average
injection

quantity

(mm

3

/ST)

Uneven

amplitude
(mm

3

/ST)

Boost

pressure

(kPa

(kg/cm

2

))

Oil

temperature

(°C)

Remarks

500

(37.0±4.0)

—

0

48±2

750

46.9±1.0

3.5

33.3 (0.34)

50±2

Standard

1150

(60.7±3.5)

—

72.0 (0.73)

50±2

1250

61.6±1.0

5.0

72.0 (0.73)

50±2

Standard

1250

(54.7±3.5)

—

0

50±2

1900

(65.6±4.0)

—

72.0 (0.73)

50±2

2100

24.8±3.0

4.5

72.0 (0.73)

52±2

Standard

375

9.0±2.0

2.0

0

48±2

Standard

100

60

—

0

48±2

+

 40

−

   0

+

 0.4

−

 0.3

Engine ; 4JB1T
Injection pump identification No. ; 104746-6311, 104746-6380

Injection volume adjustment

F06LW004.tif

F06LW001.tif

F06LW003.tif

ENGINE FUEL  6C - 53

+

 40

−

   0

+

 0.4

−

 0.3

Timer adjustment

Adjustment specification of timer and
pump case pressure

Timer

piston

stroke (mm)

At pressure

of pump

(MPa (kg/cm

2

))

Solenoid timer

Solenoid timer

Pump

rotation

(rpm)

ON

OFF

ON

OFF

Boost

Pressure

kPa

(kg/cm

2

)

Remarks

750

Over 0.5

—

—

—

72.0 (0.73)

1600

—

1.8±0.4

—

—

72.0 (0.73)

1900

—

3.7±0.2

—

618

(6.3±0.2)

72.0 (0.73) Standard

2400

—

7.0

—

—

72.0 (0.73)

Adjustment specification of injection
volume

Pump

rotation

(rpm)

Average
injection

quantity

(mm

3

/ST)

Uneven

amplitude
(mm

3

/ST)

Boost

pressure

(kPa

(kg/cm

2

))

Oil

temperature

(°C)

Remarks

500

(33.9±4.0)

—

0

48±2

750

43.8±1.0

3.5

33.3 (0.34)

50±2

Standard

1150

(57.6±3.5)

—

72.0 (0.73)

50±2

1250

58.5±1.0

5.0

72.0 (0.73)

50±2

Standard

1250

(51.6±3.5)

—

0

50±2

1900

(62.5±4.0)

—

72.0 (0.73)

50±2

2100

24.8±3.0

4.5

72.0 (0.73)

52±2

Standard

375

9.0±2.0

2.0

0

48±2

Standard

100

60

—

0

48±2

Engine ; 4JB1T
Injection pump identification No. ; 104746-6670

Injection volume adjustment

F06LW004.tif

F06LX014.tif

F06LW003.tif

6C - 54  ENGINE FUEL

Adjustment specification of injection
volume

Pump

rotation

(rpm)

Average
injection

quantity

(mm

3

/ST)

Uneven

amplitude
(mm

3

/ST)

Boost

pressure

(kPa

(kg/cm

2

))

Oil

temperature

(°C)

Remarks

500

60.5±1.0

5.0

0

48±2

Standard

800

67.4±1.0

5.5

52.0 (0.531)

50±2

Standard

800

76.8±1.0

6.0

80.0 (0.821)

50±2

Standard

1000

(83.8±6.5)

80.0 (0.821)

50±2

1250

(91.5±6.5)

80.0 (0.821)

50±2

1700

(105.7±6.5)

80.0 (0.821)

50±2

2075

34.0±3.0

7.0

80.0 (0.821)

52±2

Standard

375

13.9±2.0

2.0

0

48±2

Standard

100

60

0

48±2

Engine ; 4JB1TC
Injection pump identification No. ; 104746-6601

Injection volume adjustment

+

40

−

  0

Adjustment specification of timer and
pump case pressure

Pump

rotation

(rpm)

Timer

piston

stroke (mm)

At pressure

of pump

(MPa (kg/cm

2

))

Boost

Pressure

kPa

(kg/cm

2

)

Remarks

1020

Below 0.5

80.0 (0.82)

1350

1.8±0.2

471±29 (4.8±0.3)

80.0 (0.82) Standard

1500

(3.0±0.4)

80.0 (0.82)

1800

4.5

80.0 (0.82)

Timer adjustment

Potentiometer adjustment

Pump
speed

(r/min)

Out-put

voltage

(V)

Average
injection

quantity

(mm

3

/st)

Boost

Pressure

kPa

(kg/cm

2

)

Remarks

1080

3.56±0.03

27.5±2.0

0

Standard

375

(0.93±0.45) 13.9±2.0

0

Standard

040LX001.tif

040LX002.tif

F06LW004.tif

+

 0.4

−

 0.3

ENGINE FUEL  6C - 55

FUEL TANK

REMOVAL

Preparation:

•

Disconnect battery ground cable.

•

Loosen fuel filler cap.

•

Drain fuel from drain plug.

•

After the drain fuel, tighten the drain plug to the
specified torque.

N∙m (Kg∙m/lb∙ft)

                                                                                                                   

29 (3/22)

                                                                                                                   

1. Evapo Fuel Hose

2. Fuel Feed Hose

3. Fuel Return Hose

•

Plug the hose to prevent fuel from getting spilt, and tie
it to the frame with the plugged end up.

4. Fuel Gauge Unit Connector

•

Remove the connector of the fuel gauge.

5. Band

•

Remove the nut of the fuel tank fixing band, and then
remove the band end on the frame side.

6C-54-1.tif