Engine Isuzu 4JX1

The Japanese company assembled the 3.0-liter Isuzu 4JX1 diesel engine from 1998 to 2004 and installed it on many of its models, such as the Wizard, Trooper or the similar Opel Monterey. This 16-valve DOHC engine was fundamentally different from its OHV predecessors.

The J-engine line also includes diesels: 4JB1, 4JX1, 4JG2, 4JJ1, 4JJ3.


Production years 1998-2004
Displacement, cc 2999
Fuel system HEUI
Power output, hp 145 – 160
Torque output, Nm 295 – 335
Cylinder block cast iron R4
Block head aluminum 16v
Cylinder bore, mm 95.4
Piston stroke, mm 104.9
Compression ratio 19.0
Features DOHC, intercooler
Hydraulic lifters no
Timing drive belt
Phase regulator no
Turbocharging IHI RHF5
Recommended engine oil 5W-30
Engine oil capacity, liter 7.5
Fuel type diesel
Euro standards EURO 2/3
Fuel consumption, L/100 km (for Isuzu Trooper 2000)
— city
— highway
— combined
Engine lifespan, km ~300 000
Weight, kg 280

The engine was installed on:

  • Isuzu MU 2 (UE) in 1998 – 2004;
  • Isuzu Rodeo 2 (UE) in 1998 – 2002;
  • Isuzu Trooper 2 (UB2) in 1998 – 2002;
  • Isuzu Wizard 2 (UE) in 1998 – 2004;
  • Opel Monterey A (M92) in 1998 – 1999;
  • Honda Horizon 1 in 1998 – 1999.

Disadvantages of the Isuzu 4JX1 engine

  • This is one of the most problematic Isuzu diesels.
  • Most of its breakdowns are related to the vagaries of the unusual HEUI fuel system.
  • There are especially many complaints about the ingress of diesel fuel into the oil through nozzle seals.
  • Monitor the condition of the timing belt, if it breaks at high speed, the valves bend.
  • There are no hydraulic lifters here and periodically you need to adjust the valve clearances.

2 thoughts on “Engine Isuzu 4JX1”

    1. In general, the frame number should be on the frame on the right side in the direction of travel in the area of the rear right wheel. Sometimes under the right front door. Sometimes in the right rear arch.

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