Engine Isuzu 4JB1

The 2.8-liter Isuzu 4JB1 diesel engine was assembled at a factory in Japan from 1988 to 1998 and installed on such popular concern models as the Trooper, Wizard or Faster pickup truck. Now the production of clones of this unit has been mastered by numerous Chinese companies.

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


Production years 1988-1998
Displacement, cc 2771
Fuel system direct injection
Power output, hp 87 – 90
95 – 115 (4JB1T or 4JB1-TC)
Torque output, Nm 180 – 185
220 – 235 (4JB1T or 4JB1-TC)
Cylinder block cast iron R4
Block head cast iron 8v
Cylinder bore, mm 93
Piston stroke, mm 102
Compression ratio 18.2
18.1 (4JB1T or 4JB1-TC)
Features OHV
OHV, intercooler (4JB1T or 4JB1-TC)
Hydraulic lifters yes
no (4JB1T or 4JB1-TC)
Timing drive gears
belt (4JB1T or 4JB1-TC)
Phase regulator no
Turbocharging no
IHI RHB5 or RHF4 (4JB1T or 4JB1-TC)
Recommended engine oil 5W-40
Engine oil capacity, liter 4.2
Fuel type diesel
Euro standards EURO 1
EURO 2/3 (4JB1T or 4JB1-TC)
Fuel consumption, L/100 km (for Isuzu MU 1994)
— city
— highway
— combined
Engine lifespan, km ~450 000
Weight, kg 240

The engine was installed on:

  • Isuzu Faster 3 (TF) in 1992 – 1998;
  • Isuzu MU 1 (UC) in 1989 – 1998;
  • Isuzu Trooper 1 (UB1) in 1988 – 1991;
  • Isuzu Wizard 1 (UC) in 1992 – 1998;
  • Opel Frontera A (U92) in 1995 – 1996.

Disadvantages of the Isuzu 4JB1 engine

  • These are very reliable diesel engines, analogues of which are often used in industry;
  • Zexel fuel equipment runs for a long time, but there are problems with its spare parts;
  • Monitor the condition of the timing belt, or if it breaks, at least the rods will bend;
  • Sometimes it cuts off the gears of the oil pump and breaks the keyway on the crankshaft;
  • According to the regulations, the thermal clearances of the valves must be adjusted every 40,000 km.

3 thoughts on “Engine Isuzu 4JB1”

  1. Very good information! in contrast to the 4JA1, what are its differences with the 4JB1? and some of its variants, if I could obtain that information I would be very grateful

      1. Very informative.
        How good are the Chinese mfg 4JB1 engine?
        I recently got one in a standby generator. It starts right up and runs excellent so far. Just would love your opinion on this engine.
        Thanks, Ray

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