Isuzu KB P190. Manual - part 202

ENGINE MECHANICAL   6A – 3 

Lubricating Flow ........................................................................................................  6A- 126 

Oil Pump and Oil Filter ..............................................................................................  6A- 127 

Oil Pump .....................................................................................................................  6A- 128 

Disassembly ........................................................................................................... 6A- 128 

Inspection and Repair............................................................................................  6A- 129 

Reassembly ............................................................................................................ 6A- 130 

Oil Filter and Oil Cooler.............................................................................................  6A- 131 

Disassembly ........................................................................................................... 6A- 131 

Inspection and Repair............................................................................................  6A- 132 

Reassembly ............................................................................................................ 6A- 133 

Inter Cooler  ................................................................................................................... 6A- 135 

Removal .................................................................................................................  6A- 136 

Installation .............................................................................................................  6A- 136 

Special Tools .................................................................................................................  6A- 137 

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 

Engine weight (dry) 

kg (lb)

Approximately 239 (527) 

Fuel injection order 

1 – 3 – 4 - 2 

Fuel injection timing BTDC 

deg

8 

- 

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 

JIS No. 2, DIN/EN590, GB252-1944 Diesel fuel 

730 

± 25 (A/C Off) 

780 

± 25 (A/C ON) 

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) 

ENGINE MECHANICAL   6A – 5 

Engine model

Item 

4JA1T (L) 

4JA1TC 

Cooling system 

 

  Water pump type 

Centrifugal 

  Thermostat type 

Wax pellet with jiggle valve 

Air cleaner type 

Dry paper element 

Viscous paper element 

Battery type/voltage 

× No. of units 

80D26L 

× 1 

 

95D31L 

× 1 (OPT) 

Generator capacity 

V-A

12 – 60 

 

12 – 80 

Starter motor output 

V-kW

12 – 2.3 

Turbocharger model 

 Turbine 

type 

 Compressor 

type 

*IHI RHF 4H 

Mixed flow type 

Backward & rake 

 

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

 

6A – 6  ENGINE MECHANICAL 

MAIN DATA AND SPECIFICATIONS 

Engine model

Item 

4JH1TC 

Engine type 

Four-cycle, overhead valve, water cooled 

Combustion chamber type 

Direct injection 

Cylinder liner type 

Timing gear train system 

Dry type, chrome plated 

Gear drive 

No. of cylinders-bore 

× stroke 

mm (in)

4 – 95.4 

× 104.9 (3.76 × 4.13) 

No. of piston rings 

Compression ring: 2 / Oil ring: 1 

Total piston displacement 

liter

Compression ratio (to 1) 

2,999  

18.3 

Compression pressure 

MPa (kg/cm

2

/psi)

3.0 (31.0/441) – 200 rpm 

Engine weight (dry) 

kg (lb)

MT: Approximately 249 (549) 

AT: Approximately 236 (520) 

Fuel injection order 

1 – 3 – 4 - 2 

Specified fuel type 

JIS No.2, DIN/EN590, GB252-1944 Diesel fuel 

Idling speed 

rpm

700 

± 25 (A/C OFF) 

800 

± 25 (A/C ON) 

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 

0.4 (0.016) 

0.4 (0.016) 

24.5 

55.5 

54.0 

26.0 

 

BOSCH distributor VP44 type 

  Injection nozzle type 

  Injection nozzle opening pressure 

     

MPa (kg/cm

2

/psi)

Hole with 5 orifices 

 

1st  19.5 (199/2,828) 

2nd (Reference) 34.3

∼35.8 (350∼365/4,980∼5,197) 

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) 

  Oil pump type 

  Oil filter type 

Gear 

Cartridge paper element 

  Oil capacity 

lit (US/UK gal)

 

6.2 (1.64/1.36) (For 4 

× 2) 

7.0 (1.85/1.54) (For 4 

× 4) 

  Oil cooler type 

Water cooled