Isuzu 4ja1 User Manual

6A – 4 ENGINE MECHANICAL
MAIN DATA AND SPECIFICATIONS
Engine model
Item
4JA1T (L) 4JA1TC
Engine type
Combustion chamber type
Cylinder liner type
Timing gear train system
Four-cycle, overhead valve, water cooled
Direct injection
Dry type, chrome plated
Gear drive
No. of cylinders-bore × stroke mm (in) 4 – 93 × 92 (3.66 × 3.62)
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
Compression pressure MPa (kg/cm
2
/psi) 3.0 (31.0/441) – 200 rpm
SEngine weight (dry) kg (lb) Approximately 239 (527)
Fuel injection order 1 – 3 – 4 - 2
Fuel injection timing BTDC deg 8 -
JIS No. 2, DIN/EN590, GB252-1944 Diesel fue
730 ± 25 (A/C OFF)
850 ± 25 (A/C ON)
730 ± 25 (A/C OFF)
780 ± 25 (A/C ON)
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
0.4 (0.016)
0.4 (0.016)
24.5
55.5
54.0
26.0
Injection pump type BOSCH distributor VE type BOSCH distributor VP44 type
Governor type Mechanical (Half all speed
type)
Electronically controled
Injection nozzle type
Injection nozzle opening pressure
Hole with 5 orifices
MPa (kg/cm
2
/psi) 1st 19.1 (195 / 2,773) 1st 19.0 (194 / 2,755)
2nd (Reference)
25.5∼27.0
(260∼275 / 3,702∼3,920)
2nd (Reference)
34.0∼35.5
(347∼362 / 4,936∼5,154)
Main fuel filter type
Lubricating system
Lubricating method
Cartridge paper element and water separator
Pressure circulation
Specified engine oil (API grade) ISUZU genuine 10W – 30 (API CD of ACEA B2/B3)

Isuzu 4ja1 Specifications

General

Brand	Isuzu
Model	4ja1
Category	Engine
Language	English