Engine Mitsubishi 3A91

The company assembled the 1.1-liter 3-cylinder Mitsubishi 3A91 engine from 2004 to 2012 and installed it only on the sixth generation of the Colt model and the Smart hatchback similar to it. According to the nomenclature of the Daimler-Chrysler concern, such a power unit is known as the Mercedes M134.

The 3A9 family also includes engines: 3A90 and 3A92.

The engine was installed on:

  • Mitsubishi Colt 6 (Z30) in 2004 – 2012;
  • Smart Forfour 1 (W454) in 2004 – 2006.


Production years 2004-2012
Displacement, cc 1124
Fuel system distributed injection
Power output, hp 75
Torque output, Nm 100
Cylinder block aluminum R3
Block head aluminum 12v
Cylinder bore, mm 75
Piston stroke, mm 84.8
Compression ratio 10.5
Features DOHC
Hydraulic lifters no
Timing drive chain
Phase regulator MIVEC
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 3.2
Fuel type petrol
Euro standards EURO 4/5
Fuel consumption, L/100 km (for Mitsubishi Colt 2005)
— city
— highway
— combined
Engine lifespan, km ~220 000
Weight, kg 92

Disadvantages of the Mitsubishi 3A91 engine

  • In the early years there were problems with floating speeds, but everyone was treated with firmware;
  • And so the main problems of this power unit are associated only with lubricant consumption;
  • Thin piston rings lie already by 100,000 km of run and an oil burner appears;
  • After 150,000 km, the timing chain often needs to be replaced and most often with a phase regulator;
  • There are no hydraulic lifters here, so do not forget about adjusting valve clearances.

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