Overview of the Engine
The Mitsubishi 4G37 is a 1.8-liter inline-four engine that has carved out a niche in the automotive world due to its robust design and versatile performance. Launched in the late 1970s, this engine is part of Mitsubishi’s well-regarded 4G family, which has been a foundation for various models over the years. The 4G37 is known for its reliability and efficiency, making it a popular choice for both everyday drivers and enthusiasts alike.
This engine features a SOHC (Single Overhead Camshaft) configuration, which allows for a simpler design while still delivering respectable power output. It typically produces around 85 to 100 horsepower, depending on the specific model and tuning. The engine’s design prioritizes fuel efficiency, which was particularly appealing during an era of rising fuel prices. Its compact size and lightweight construction also contribute to improved handling characteristics in the vehicles it powers.
Applications in Various Vehicles
The Mitsubishi 4G37 engine has been utilized in a range of vehicles, showcasing its adaptability across different automotive segments. Some notable applications include:
– Mitsubishi Galant: The 4G37 engine found a home in the Galant, particularly in the late 1970s and early 1980s models. Known for its spacious interior and comfortable ride, the Galant benefited from the engine’s balance of performance and economy.
– Mitsubishi Lancer: Another key model featuring the 4G37 is the Lancer. This compact car gained popularity for its sporty demeanor and was often favored by younger drivers seeking an affordable yet spirited driving experience.
– Mitsubishi Eclipse: In the early 1990s, the Eclipse made waves in the compact sports car market. Some variants were equipped with the 4G37, providing an engaging drive that appealed to performance enthusiasts.
– Mitsubishi Pajero: The 4G37 engine was also used in certain versions of the Pajero, a rugged SUV known for its off-road capabilities. The engine’s reliability made it a suitable choice for those venturing off the beaten path.
– Mitsubishi Colt: The Colt, a subcompact car, also utilized the 4G37 engine, offering drivers a nimble and economical option for city driving.
In addition to these models, the 4G37 engine has been used in various regional and international variants, showcasing Mitsubishi’s commitment to providing reliable powertrains across its lineup. Its longevity in production is a testament to its engineering and the trust it has garnered from both manufacturers and consumers alike.
Engine Specifications
The Mitsubishi 4G37 engine is a well-engineered powerplant that has been a reliable choice for various vehicles. Below are the detailed specifications that highlight its features and performance characteristics.
Technical Specifications
| Specification | Details |
|---|---|
| Engine Type | Inline-4, SOHC |
| Displacement | 1.8 Liters (1795 cc) |
| Compression Ratio | 8.8:1 |
| Maximum Power Output | 85-100 hp @ 5,500 rpm |
| Maximum Torque | 140-150 Nm @ 3,000 rpm |
| Fuel System | Carbureted / Multi-Point Fuel Injection (varies by model) |
| Fuel Type | Regular unleaded gasoline |
| Ignition System | Conventional distributor type |
| Cooling System | Water-cooled |
| Engine Weight | Approx. 120 kg (265 lbs) |
Performance Metrics
The performance metrics of the 4G37 engine are quite respectable for its class, making it suitable for both daily commuting and spirited driving.
| Performance Metric | Value |
|---|---|
| 0-60 mph | Approximately 10-12 seconds (varies by vehicle weight) |
| Top Speed | Approximately 110-120 mph |
| Fuel Economy (City) | 20-25 mpg |
| Fuel Economy (Highway) | 25-30 mpg |
Oil Capacity and Recommendations
Maintaining proper oil levels and using the right type of oil is crucial for the longevity and performance of the 4G37 engine.
| Specification | Details |
|---|---|
| Oil Capacity (with filter) | Approx. 4.2 liters (4.4 quarts) |
| Oil Type | SAE 10W-30 or 10W-40 (conventional or synthetic) |
| Oil Change Interval | Every 5,000 to 7,500 miles |
This combination of specifications highlights the Mitsubishi 4G37 engine’s capabilities, making it a noteworthy option in its category. Its balance of power, efficiency, and reliability has allowed it to remain a favorite among drivers and mechanics alike.
Common Problems and Reliability
The Mitsubishi 4G37 engine has built a reputation for reliability over the years, but like any mechanical system, it is not without its issues. Understanding these common problems can help owners and mechanics prepare for maintenance and repairs, ensuring longevity and optimal performance.
Common Issues
While the 4G37 is generally dependable, some specific problems have been reported by users:
1. Oil Leaks
– Oil leaks are a common issue, particularly around the valve cover gasket and oil pan. Over time, gaskets can wear out and fail, leading to oil seepage.
– Regular inspections can help catch these leaks early, preventing more significant issues down the line.
2. Cooling System Failures
– The engine’s cooling system can experience problems, particularly with the water pump and radiator.
– Overheating can occur if the cooling system is not maintained, leading to potential engine damage.
3. Timing Belt Issues
– The 4G37 engine uses a timing belt, which should be replaced according to the manufacturer’s recommended intervals.
– A worn or broken timing belt can lead to severe engine damage, including bent valves and piston damage.
4. Carburetor Problems
– For models equipped with a carburetor, issues such as clogging and improper tuning can affect performance.
– Regular maintenance and cleaning can help mitigate these problems.
5. Ignition System Failures
– The ignition system, particularly the distributor and spark plugs, can experience wear over time.
– Poor ignition performance can lead to misfires, reduced fuel efficiency, and a rough idle.
Reliability Factors
Despite these potential issues, many owners find the 4G37 engine to be quite reliable when properly maintained. Several factors contribute to its overall dependability:
- Build Quality: Mitsubishi is known for its solid engineering, and the 4G37 is no exception. The materials used in construction are generally durable, contributing to a longer lifespan.
- Simplicity of Design: With its SOHC configuration, the 4G37 is less complex than some modern engines. This simplicity often translates to easier repairs and lower maintenance costs.
- Availability of Parts: Being a popular engine, parts for the 4G37 are widely available and often affordable, making repairs more accessible for owners.
- Community Support: A robust community of enthusiasts and mechanics familiar with the 4G37 can provide valuable advice and support for troubleshooting and repairs.
In summary, while the Mitsubishi 4G37 engine has its share of common problems, its overall reliability is commendable. Regular maintenance and timely repairs can significantly extend its lifespan, ensuring that it continues to perform well for years to come.