Isuzu engine 4j series. Manual - part 8

SERVICE INFORMATION  00 – 31

Item

Engine Model

4JB1 / 4JB1T / 4JB1TC

4JG2 (G. EXP & EC)

Lubricating system

Lubrication method

Pressurized circulation

Specified engine oil (API grade)

CC (4JB1)

CD (4JB1T/4JB1TC)

CC

Oil pump type

Gear

Oil filter type

Disposable cartridge (Spin-on) Paper element

Oil capacity (Including oil filter)

lit (US/UK gal)

6.6 - 7.1 (1.74 - 1.87/2.62 - 2.82)

(For EC  6.2 - 8.2 (2.17 - 1.64 / 1.36 - 1.80))

Oil cooler type

Water cooled

Fuel system

Injection pump type

Bosch distributor

Governor type

Mechanical (Partially variable speed) (For EC Variable speed)

Injection nozzle type

Hole

Pinttle

Injection nozzle 

kPa (kg/cm

2

/psi)

opening pressure

18,142 (185 / 2,631)

(4JB1/4JB1T)

1st:

19,500 (199 / 2,830)

2nd: 26,500 (270 / 3,840)

(4JB1TC)

14,710 (150/2,133)

Main fuel filter type

Cartridge paper element and water separator

Air cleaner type

Dry paper element

Generator capacity

V-A (W)

12 - 40 (480) and 12 - 50 (600)

12 - 50 (600)

(For EC 12 - 60 (720))

Starter motor output

V-kW

12 - 2.0 and 12 - 2.2

12 - 2.2

(For EC 12 - 2.0)

Turbocharger

IHI RHB5 (4JB1T)

IHI RHF4 (4JB1TC)

00 – 32

  SERVICE INFORMATION

Engine Cooling

Cooling system
Radiator
Heat radiation capacity

kcal/h

Heat radiation area

m

2

 (ft

2

)

Front area

m

2

 (ft

2

)

Dry weight

N (Kg/lb)

Radiator cap
Valve opening pressure

kPa (Kg/cm

2

/psi)

Coolant capacity

lit (Imp.qt./US qt.)

Coolant forced circulation

(2 tube in row) Tube type Corrugated

71400

11.78 (126.8)
0.216 (2.325)

105 (10.7/23.6)

88.2 - 116.7 (0.899 - 1.199/12.78 - 17.05)

3.1 (2.73/3.28)

(For EC 5.8 (5.1/6.13))

Coolant pump
Pulley type
Pulley ratio

Centrifugal impeller type

1.2

Thermostat type

Valve opening

°C (°F)

Valve full open

°C (°F)

wax pellet with jiggle valve.

Without jiggle valve (Thailand only)

82 (180)
95 (203)

Coolant total capacity

Iit (Imp.qt./US qt.)

10 (8.80/10.57) (For EC 7.3 (6.42/7.71))

Starting System

Manufacturer

DENSO

Engine Model

4JB1 / 4JB1T / 4JB1TC

4JG2 (G.EXP & EC)

Rating

Voltage

V

12

Output

kW

2.0

2.2

Time

Sec

30

Number of tooth of pinion

9

Rotating direction (as viewed from pinion)

Clockwise

Weight (approx.)

kg

4.6

5.4

No-load characteristics

Voltage/current

V/A

Speed

rpm

11.5/100 or less

3700 or more

Load characteristics

Voltage/current

V/A

Torque

N•m(Kg•m/lb•ft)

7.5/500 or less
13.7 (1.4/10.1)

Speed

rpm

1200 or more

1400 or more

Locking characteristics

Voltage/current

V/A

Torque

N•m(Kg•m/lb•ft)

2.4/800 or less

18 (1.8/13) or more

2.0/850 or less

16 (1.6/12) or more

SERVICE INFORMATION  00 – 33

Charging System

Manufacturer

HITACHI LR150-449B

DENSO

Rated voltage

V

12

12

Rated output 

A

50

40

Rotating direction
(As viewed from pulley)

Clockwise

Clockwise

Pulley effective diameter 

mm (in)

80 (3.15)

82 (3.23)

Weight (with pump)

kg (lb)

6.0 (13.27)

4JB1TC for G.E

4JB1TC for EC

6.7 (14.77)

4JB1TC for Thailand

00 – 34

  SERVICE INFORMATION

SERVICE STANDARD

Engine Mechanical

mm (in)

Service standard

Service limit

Parts

Items

4JG2

4JB1 / 4JB1T /

4JB1TC

4JG2

4JB1 / 4JB1T /

4JB1TC

Remarks

Cylinder head deck, and
exhaust manifold mating
surface for flatness

0.05 (0.002) or less

0.2 (0.0079)

Cylinder head height

92.0 (3.622)

91.55 (3.6043)

Cylinder
Head

Cylinder Head Lower Face
Warpage.

Manifold Warpage.

Hot plug sinking

Hot plug exert pressure

0.05 (0.002)or less

0.05 (0.002) or less

-

4,500 – 5,500 kg

(9922.5 - 12127.5 lbs)

0.20 (0.008)

0.20 (0.008)

0.02 (0.0008)

-

Cannot be
Reground

Valve
Spring

Free height

Squareness

Spring tension

N (kg/lb)

48.0 (1.891)

-

296 (30.2/66.4)

47.10 (1.856)

1.7 (0.067)

257.9 (26.3/57.9)

At installed

height

38.9 (1.531)

7.946 - 7.961

(0.3128 - 0.3134)

7.921 - 7.936

(0.3118 - 0.3124)

0.039 - 0.069

(0.0015 - 0.0027)

0.064 - 0.096

(0.0025 - 0.0038)

13.0 (0.512)

1.1 (0.0433)

7.880 (0.3102)

7.850 (0.3090)

0.200 (0.0079)

0.250 (0.0098)

-

1.6 (0.0630)

1.41 (0.0556)

1.39 (0.0547)

1.79 (0.0705)

1.83 (0.0720)

1.1 (0.0433)

1.1 (0.0433)

1.5 (0.06)

1.5 (0.06)

Valve
and
Valve
Guide

Diameter Valve Stem

IN

EX

Valve and valve guide
clearance

IN

EX

Valve guide upper end
height (Measured from the
Cylinder head upper face)

Valve guide margin

Valve thickness

IN

EX

Valve seat contact surface
angle

Valve seat contact width

IN

EX

45°

1.7 (0.0669)

2.0 (0.0787)

2.2 (0.0866)

2.5 (0.0984)