Engine Isuzu 4JJ1

The 3.0-liter Isuzu 4JJ1 diesel engine has been assembled at the Japanese plant since 2004 and is installed on the popular D-Max pickup truck or the MU-X off-road vehicle. There are OHV engine versions: 4JJ1-T, 4JJ1-X, 4JJ1-TCN, 4JJ1-TCS for commercial vehicles.

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


Production years since 2004
Displacement, cc 2999
Fuel system Common Rail
Power output, hp 146 (4JJ1-TC)
163 – 177 (4JJ1-TCX)
177 (4JJ1-TC HI)
Torque output, Nm 294 (4JJ1-TC)
360 – 380 (4JJ1-TCX)
430 (4JJ1-TC HI)
Cylinder block cast iron R4
Block head aluminum 16v
Cylinder bore, mm 95.4
Piston stroke, mm 104.9
Compression ratio 17.5 (4JJ1-TC)
17.3 – 17.5 (4JJ1-TCX)
16.5 (4JJ1-TC HI)
Features DOHC
Hydraulic lifters no
Timing drive chain and gears
Phase regulator no
Turbocharging IHI RHV4 (4JJ1-TC)
Recommended engine oil 5W-30
Engine oil capacity, liter 7.0
Fuel type diesel
Euro standards EURO 2/3 (4JJ1-TC)
EURO 3/4 (4JJ1-TCX)
Fuel consumption, L/100 km (for Isuzu D-Max 2018)
— city
— highway
— combined
Engine lifespan, km ~500 000
Weight, kg 322

The engine was installed on:

  • Isuzu D-Max 1 (RA) in 2002 – 2012; D-Max 2 (RT) since 2011;
  • Isuzu MU-7 1 (510) in 2004 – 2013;
  • Isuzu MU-X 1 (RF) in 2013 – 2021.

Disadvantages of the Isuzu 4JJ1 engine

  • This is a strong and resourceful diesel engine, but quite noisy, as well as vibration-loaded.
  • The Denso fuel system is quite reliable, but demanding on the quality of diesel fuel.
  • The timing chain runs for a long time, but its hydraulic tensioner can already give up by 200,000 km.
  • Many problems of this power unit are solved after cleaning the EGR valve.
  • Periodically, you need to adjust the valves, since there are no hydraulic lifters here.

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