Engine Mitsubishi 6G71

The Mitsubishi 6G71 2.0-liter 12-valve V6 engine was produced only from 1986 to 1992 and was installed on such popular models as the fifth generation Diamante, Debonair and Galant. There were versions with distributed or single injection, gas and with a Mikuni compressor.

The 6G7 family also includes engines: 6G72, 6G72TT, 6G73, 6G74 and 6G75.

The engine was installed on:

  • Mitsubishi Debonair 2 (S1) in 1986 – 1992;
  • Mitsubishi Diamante 1 (F1) in 1990 – 1992;
  • Mitsubishi Galant 5 (E1) in 1986 – 1990.


Production years 1986-1992
Displacement, cc 1998
Fuel system single injection (SPI SOHC)
distributed injection (MPI SOHC)
distributed injection (6G71-T Supercharger)
Power output, hp 105 (SPI SOHC)
120 – 125 (MPI SOHC)
150 (6G71-T Supercharger)
Torque output, Nm 158 (SPI SOHC)
172 (MPI SOHC)
221 (6G71-T Supercharger)
Cylinder block cast iron V6
Block head aluminum 12v
Cylinder bore, mm 74.7
Piston stroke, mm 76
Compression ratio 8.9 (SPI SOHC)
8.9 (MPI SOHC)
8.0 (6G71-T Supercharger)
Features SOHC (SPI SOHC)
SOHC, intercooler (6G71-T Supercharger)
Hydraulic lifters yes
Timing drive belt
Phase regulator no
Turbocharging no (SPI SOHC)
Mikuni DM51 (6G71-T Supercharger)
Recommended engine oil 5W-40
Engine oil capacity, liter 4.3
Fuel type petrol
Euro standards EURO 1 (SPI SOHC)
EURO 2 (6G71-T Supercharger)
Fuel consumption, L/100 km (for Mitsubishi Debonair 1989)
— city
— highway
— combined
Engine lifespan, km ~300 000
Weight, kg 190

Disadvantages of the Mitsubishi 6G71 engine

  • The motors of the first years of production were damp and caused a lot of problems.
  • Then the quality increased and the owners often complained only about oil consumption.
  • The main thing is not to miss the lubrication level, since the liners are not uncommon.
  • The main cause of floating speed is contamination of the throttle or idle speed controller.
  • Weaknesses include an unreliable ignition system and hydraulic lifters.

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