The 1.8-liter Mitsubishi 4G37 engine was produced by the Japanese concern from 1983 to 1994 and was installed on such popular company models as the Lancer, Galant or Eclipse. This power unit was offered in both carburetor and ECI-MULTI injection versions.
4G3 (Saturn) family: 4G32, 4G33, 4G37.
Specifications
| Production years | 1983-1994 |
| Displacement, cc | 1755 |
| Fuel system | carburetor (4G37 carburetor) injector (4G37B ECI-multi) |
| Power output, hp | 86 (4G37 carburetor) 90 – 97 (4G37B ECI-multi) |
| Torque output, Nm | 137 (4G37 carburetor) 138 – 144 (4G37B ECI-multi) |
| Cylinder block | cast iron R4 |
| Block head | aluminum 8v |
| Cylinder bore, mm | 80.6 |
| Piston stroke, mm | 86 |
| Compression ratio | 9.0 (4G37 carburetor) 9.5 (4G37B ECI-multi) |
| Features | no |
| Hydraulic lifters | no |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-40 |
| Engine oil capacity, liter | 3.9 |
| Fuel type | petrol |
| Euro standards | EURO 0 (4G37 carburetor) EURO 1/2 (4G37B ECI-multi) |
| Fuel consumption, L/100 km (for Mitsubishi Galant 1990) — city — highway — combined |
10.3 6.1 7.9 |
| Engine lifespan, km | ~350 000 |
| Weight, kg | 135 |
The engine was installed on:
- Mitsubishi Eclipse 1G in 1989 – 1994;
- Mitsubishi Galant E10 in 1983 – 1989, Galant E30 in 1987 – 1993;
- Mitsubishi Lancer CV in 1987 – 1990, Lancer CA in 1988 – 1992;
- Mitsubishi Space Wagon in 1983 – 1991;
- Dodge Colt in 1985 – 1991 (4WD wagon);
- Eagle Talon 1 in 1993 – 1994;
- Mitsubishi Tredia A210 in 1982 – 1989;
- Plymouth Laser 1 in 1989 – 1994.
Disadvantages of the Mitsubishi 4G37 engine
- Short-lived belts cause the most problems: timing belt and balancer shaft belt;
- Oil seals often ooze oil, which gets on the belts and reduces their life;
- In second place are the failures of the electronic control unit and the ignition system;
- The reason for the floating engine speed at idle is the contamination of the idle speed controller or throttle;
- Valve clearances require frequent adjustment, power unit supports do not last long.
Frequently asked questions about the Mitsubishi 4G37
How much power does the Mitsubishi 4G37 make?
Power output of the Mitsubishi 4G37, hp: 86 (4G37 carburetor); 90 - 97 (4G37B ECI-multi). Torque, Nm: 137 (4G37 carburetor); 138 - 144 (4G37B ECI-multi).
How much oil does the Mitsubishi 4G37 take and which one?
Engine oil capacity: 3.9 liters. Recommended oil: 5W-40.
Does the Mitsubishi 4G37 have a timing belt or chain?
The Mitsubishi 4G37 uses a timing belt.
Is the Mitsubishi 4G37 turbocharged?
No, the Mitsubishi 4G37 is naturally aspirated.
Does the Mitsubishi 4G37 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 4G37 last?
The typical lifespan of the Mitsubishi 4G37 is ~350 000 km with proper maintenance.
What is the fuel consumption of the Mitsubishi 4G37?
Mitsubishi Galant 1990: city 10.3, highway 6.1, combined 7.9 L/100 km.
What cars was the Mitsubishi 4G37 installed on?
Mitsubishi Eclipse 1G in 1989 - 1994; Mitsubishi Galant E10 in 1983 - 1989, Galant E30 in 1987 - 1993; Mitsubishi Lancer CV in 1987 - 1990, Lancer CA in 1988 - 1992; Mitsubishi Space Wagon in 1983 - 1991; Dodge Colt in 1985 - 1991 (4WD wagon); Eagle Talon 1 in 1993 - 1994 and 2 more (see the full list above).
What are the common problems of the Mitsubishi 4G37?
Short-lived belts cause the most problems: timing belt and balancer shaft belt. Oil seals often ooze oil, which gets on the belts and reduces their life. All known problems.
