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.
Specifications
| 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 |
7.0 4.6 5.5 |
| Engine lifespan, km | ~220 000 |
| Weight, kg | 92 |
The engine was installed on:
- Mitsubishi Colt 6 (Z30) in 2004 – 2012;
- Smart Forfour 1 (W454) in 2004 – 2006.
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.
Frequently asked questions about the Mitsubishi 3A91
How much power does the Mitsubishi 3A91 make?
The Mitsubishi 3A91 develops 75 hp and 100 Nm of torque.
How much oil does the Mitsubishi 3A91 take and which one?
Engine oil capacity: 3.2 liters. Recommended oil: 5W-30.
Does the Mitsubishi 3A91 have a timing belt or chain?
The Mitsubishi 3A91 uses a timing chain.
Is the Mitsubishi 3A91 turbocharged?
No, the Mitsubishi 3A91 is naturally aspirated.
Does the Mitsubishi 3A91 need valve clearance adjustment?
Yes, there are no hydraulic lifters, so the valve clearances have to be checked and adjusted periodically.
How long does the Mitsubishi 3A91 last?
The typical lifespan of the Mitsubishi 3A91 is ~220 000 km with proper maintenance.
What is the fuel consumption of the Mitsubishi 3A91?
Mitsubishi Colt 2005: city 7.0, highway 4.6, combined 5.5 L/100 km.
What cars was the Mitsubishi 3A91 installed on?
Mitsubishi Colt 6 (Z30) in 2004 - 2012; Smart Forfour 1 (W454) in 2004 - 2006.
What are the common problems of the Mitsubishi 3A91?
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. All known problems.
