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.
6G7 family: 6G71, 6G72, 6G72TT, 6G73, 6G74, 6G75.
Specifications
| 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 (MPI SOHC) SOHC, intercooler (6G71-T Supercharger) |
| Hydraulic lifters | yes |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | no (SPI SOHC) no (MPI 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 (MPI SOHC) EURO 2 (6G71-T Supercharger) |
| Fuel consumption, L/100 km (for Mitsubishi Debonair 1989) — city — highway — combined |
14.3 9.1 11.0 |
| Engine lifespan, km | ~300 000 |
| Weight, kg | 190 |
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.
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.
Frequently asked questions about the Mitsubishi 6G71
How much power does the Mitsubishi 6G71 make?
Power output of the Mitsubishi 6G71, hp: 105 (SPI SOHC); 120 - 125 (MPI SOHC); 150 (6G71-T Supercharger). Torque, Nm: 158 (SPI SOHC); 172 (MPI SOHC); 221 (6G71-T Supercharger).
How much oil does the Mitsubishi 6G71 take and which one?
Engine oil capacity: 4.3 liters. Recommended oil: 5W-40.
Does the Mitsubishi 6G71 have a timing belt or chain?
The Mitsubishi 6G71 uses a timing belt.
Is the Mitsubishi 6G71 turbocharged?
Yes, the Mitsubishi 6G71 is turbocharged (no (SPI SOHC); no (MPI SOHC); Mikuni DM51 (6G71-T Supercharger)).
Does the Mitsubishi 6G71 need valve clearance adjustment?
No, the Mitsubishi 6G71 has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Mitsubishi 6G71 last?
The typical lifespan of the Mitsubishi 6G71 is ~300 000 km with proper maintenance.
What is the fuel consumption of the Mitsubishi 6G71?
Mitsubishi Debonair 1989: city 14.3, highway 9.1, combined 11.0 L/100 km.
What cars was the Mitsubishi 6G71 installed on?
Mitsubishi Debonair 2 (S1) in 1986 - 1992; Mitsubishi Diamante 1 (F1) in 1990 - 1992; Mitsubishi Galant 5 (E1) in 1986 - 1990.
What are the common problems of the Mitsubishi 6G71?
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. All known problems.
