Engine Isuzu 4JJ3

The 3.0-liter Isuzu 4JJ3 diesel engine has been assembled at a plant in Japan since 2019 and is installed in the popular MU-X SUV, D-Max pickup truck or similar Mazda BT-50. This power unit is essentially a seriously upgraded version of the 4JJ1 engine.

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


Production years since 2019
Displacement, cc 2999
Fuel system Common Rail
Power output, hp 190
Torque output, Nm 450
Cylinder block cast iron R4
Block head aluminum 16v
Cylinder bore, mm 95.4
Piston stroke, mm 104.9
Compression ratio 16.3
Features DOHC
Hydraulic lifters no
Timing drive chain and gears
Phase regulator no
Turbocharging IHI RHS4
Recommended engine oil 5W-30
Engine oil capacity, liter 7.0
Fuel type diesel
Euro standards EURO 5
Fuel consumption, L/100 km (for Isuzu D-Max 2021)
— city
— highway
— combined
Engine lifespan, km ~500 000
Weight, kg 320

The engine was installed on:

  • Isuzu D-Max 3 (RG) since 2019;
  • Isuzu MU-X 2 (RJ) since 2020;
  • Mazda BT-50 III (TF) since 2020.

Disadvantages of the Isuzu 4JJ3 engine

  • On specialized forums, he is not particularly scolded and often complains only about vibration loading.
  • The fuel system from Denso turned out to be quite demanding on the quality of diesel fuel.
  • As always, a lot of trouble is caused by contamination of the particulate filter and the EGR valve.
  • There are no hydraulic lifters here and periodically you need to adjust the valve clearance.

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