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.