Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 541

6A – 2 ENGINE MECHANICAL

MAIN DATA AND SPECIFICATIONS

Engine model

Item

4JA1 4JB1T

Engine type
Combustion chamber type
Cylinder liner type
Timing gear train system

Four-cycle, overhead valve, water cooled

Direct injection

Dry type, chrome plated, stainless steel tube

Gear drive

No. of cylinders-bore

× stroke

mm (in)

4 – 93

× 92 (3.66 × 3.62)

4 – 93

× 102 (3.66 × 4.02)

No. of piston rings

Compression ring: 2 / Oil ring: 1

Total piston displacement

cm

3

(in

3

)

Compression ratio (to 1)

2,499 (152.4)

18.5

2,771 (169.0)

18.1

Compression pressure

kg/cm

2

(psi/MPa)

31 (441/3.0) – 200 rpm

Engine weight

kg (lb)

Approximately 226 (498)

Approximately 250 (550)

Fuel injection order

1 – 3 – 4 - 2

Fuel injection timing BTDC

deg

12

11

Specified fuel type
Idling speed

rpm

Valve clearances (At cold): Intake

mm (in)

Exhaust

mm

(in)

Intake valves

Open at (BTDC)

deg

Close

at

(ABDC)

deg

Exhaust valves

Open at (BBDC)

deg

Close

at

(ATDC)

deg

Fuel system
Injection pump type

SAE No. 2 diesel fuel

750

0.4 (0.016)
0.4 (0.016)

24.5
55.5
54.0
26.0

BOSCH distributor VE type

Governor type

Mechanical (Variable speed) Mechanical (Limit speed)

Injection

nozzle

type

Injection nozzle opening pressure

(Design

value)

kg/cm

2

(psi/MPa)

Single

spring

type

Main fuel filter type

Lubricating system

Lubricating

method

Hole with 5 orifices

185 (2,631/18.1)

Cartridge paper element and water separator

Pressure circulation

Specified engine oil (API grade)

CC or CD

CD

Oil pump type

Oil

filter

type

Oil capacity

lit(US/UK gal)

Oil

cooler

type

Gear

Cartridge paper element

6.5 (1.7/1.43)

Water cooled

4JB1T : 4JB1 Engine with turbocharger.

ENGINE MECHANICAL 6A – 3

Engine model

Item

4JA1 4JB1T

Cooling system

Water

pump

type

Thermostat

type

Air cleaner type

Battery type/voltage

× No. of units

Centrifugal

Wax pellet with jiggle valve

Dry paper element

95D31R-12

× 1

Generator capacity

V-A (kw)

12 – 40 (480)

12 – 50 (600)

Starter motor output

V-kw

12 – 2.0 or 12 – 2.8

Turbocharger model

Turbine

type

Compressor

type

*IHI RHF4H

Radial-inflow

Radial-outflow

*IHI : Ishikawajima-Harima Heavy Industries., Ltd.

6A – 4 ENGINE MECHANICAL

MAIN DATA AND SPECIFICATIONS

Engine model

Item

4JA1T (L)

4JG2T

Engine type

Four-cycle, overhead valve, water cooled

Combustion chamber type

Direct injection

In Direct injection

Cylinder liner type
Timing gear train system

Dry type, chrome plated, stainless steel tube

Belt drive

No. of cylinders-bore

× stroke

mm (in)

4 – 93

× 92 (3.66 × 3.62)

4 – 95.4

× 107 (3.76 × 4.21)

No. of piston rings

Compression ring: 2 / Oil ring: 1

Total piston displacement

cm

3

(in

3

)

Compression ratio (to 1)

2,499 (152.4)

18.5

3,059 (186.6)

20.0

Compression pressure

kg/cm

2

(psi/MPa)

31 (441/3.0) – 200 rpm

Engine weight

kg (lb)

Approximately 226 (498)

Approximately 267 (588.7)

Fuel injection order

1 – 3 – 4 - 2

Fuel injection timing BTDC

deg

12

0

Specified fuel type

EC diesel fuel

Idling speed

rpm

770

720

Valve clearances (At cold): Intake

mm (in)

Exhaust

mm

(in)

Intake valves

Open at (BTDC)

deg

Close

at

(ABDC)

deg

Exhaust valves

Open at (BBDC)

deg

Close

at

(ATDC)

deg

Fuel system
Injection pump type
Governor

type

0.4 (0.016)
0.4 (0.016)

24.5
55.5
54.0
26.0

BOSCH distributor VE type

Mechanical (HALF variable speed)

Injection

nozzle

type

Injection nozzle opening pressure
(Design value)

kg/cm

2

(psi/MPa)

Hole with 5 orifices

185 (2,631/18.1)

Throttle

150 (2,133/14.7)

Single

spring

type

Main fuel filter type
Lubricating system
Lubricating

method

Cartridge paper element and water separator

Pressure circulation

Specified engine oil (API grade)

CD

Oil pump type

Oil

filter

type

Gear

Cartridge paper element

Oil capacity

lit (US/UK gal)

6.5 (1.7/1.4)

6.5 (1.7/1.4) For 4

× 2

7.3 (1.9/1.6) For 4

× 4

Oil cooler type

Water cooled

4JG2T : 4JG2 Engine with turbocharger. 4JA1T : 4JA1 Engine with turbocharger.

ENGINE MECHANICAL 6A – 5

Engine model

Item

4JA1T (L)

4JG2T

Cooling system

Water

pump

type

Thermostat

type

Air cleaner type

Battery type/voltage

× No. of units

Generator capacity

V-A (kw)

Centrifugal

Wax pellet with jiggle valve

Wet paper element

95D31R-12

× 1

12 – 50 (600)

Starter motor output

V-kw

12 – 2.3

12 – 2.8

Turbocharger model

IHI RHF 4H

IHI RHB52W (manual T/M)

IHI RHF5 (automatic T/M)

Turbine

type

Compressor

type

Radial-inflow

Radial-outflow

*IHI : Ishikawajima-Harima Heavy Industries., Ltd.