The Mitsubishi 4D68 and 4D65 diesel engines were part of a line of engines developed by Mitsubishi Motors that were popular throughout the 1980s and 1990s. These engines were under the hood of models such as the Mitsubishi Galant, Lancer and Colt and were offered in both atmospheric and turbocharged versions.
Mitsubishi 4D68 engine
Technical specifications
The 4D68 engine was produced from 1991 to 2002 and had two main modifications:
4D68 Non-Turbo 2.0 D 8v
- Volume: 1998 cm³
- Power system: forkamers
- Power: 68 hp
- Torque: 123 Nm
- Cylinder block: cast iron R4
- Cylinder head: aluminum 8v
- Cylinder bore: 82.7 mm
- Piston stroke: 93 mm
- Compression ratio: 22.4
- Transmission timing: belt drive
- Turbocharging: none
- Fuel type: diesel
- Environmental class: EURO 2
- Example service life: 300 000 km
4D68T Turbo 2.0 TD 8v
- Volume: 1998 cm³
- Power system: pre-chamber
- Power: 90 hp
- Torque: 191 – 202 Nm
- Cylinder block: cast iron R4
- Cylinder head: aluminum 8v
- Cylinder bore: 82.7 mm
- Piston stroke: 93 mm
- Compression ratio: 22.4
- Transmission: belt drive
- Turbocharging: yes
- Fuel type: diesel
- Environmental class: EURO 3
- Example service life: 250,000 km
Fuel consumption
For example, let’s take a 1998 Mitsubishi Galant 2.0 TD with manual transmission:
- City cycle: 9.3 liters
- Highway: 5.7 liters
- Mixed cycle: 7.0 liters
Application
Engine 4D68 was installed on:
- Mitsubishi Colt 4 (CA) and 5 (CJ)
- Mitsubishi Lancer 4 and 5
- Mitsubishi Galant 7 (E5) and 8 (EA)
- Proton Wira 1
Mitsubishi 4D65 engine
Specifications
The 4D65 engine was produced from 1983 to 1995 and also had two main modifications:
4D65 Non-Turbo 1.8 D 8v
- Volume: 1795 cm³
- Power system: forkamers
- Power: 60 hp
- Torque: 113 Nm
- Cylinder block: cast iron R4
- Cylinder head: aluminum 8v
- Cylinder bore: 80.6 mm
- Piston stroke: 88 mm
- Compression ratio: 22.2
- Transmission timing: belt drive
- Turbocharging: none
- Fuel type: diesel
- Environmental class: EURO 1
- Example service life: 250,000 km
4D65T Turbo 1.8 TD 8v
- Volume: 1795 cm³
- Power system: pre-chamber
- Power: 75 hp
- Torque: 152 Nm
- Cylinder block: cast iron R4
- Cylinder head: aluminum 8v
- Cylinder bore: 80.6 mm
- Piston stroke: 88 mm
- Compression ratio: 22.2
- Transmission: belt drive
- Turbocharging: yes
- Fuel type: diesel
- Environmental class: EURO 2
- Example service life: 220,000 km
Fuel consumption
For example, let’s take a 1990 Mitsubishi Galant 1.8 TD with manual transmission:
- City cycle: 9.5 liters
- Highway: 5.4 liters
- Mixed cycle: 7.3 liters
Application
Engine 4D65 was installed on:
- Mitsubishi Colt 2
- Mitsubishi Lancer 2, 3, and 4
- Mitsubishi Galant 5 (E1) and 6 (E3)
Disadvantages, breakdowns, and problems with Mitsubishi 4D6 series engines
The 4D6 series engines, such as the 4D68 and 4D65, have gained a reputation for their advantages, but they also have a number of disadvantages and common problems experienced by owners.
The main problems are:
Oil leaks
Frequent oil leaks from gaskets and oil seals cause significant inconvenience to owners. This requires regular inspection and replacement of problematic components.
G timing belt
The timing belt is designed to last up to 90,000 kilometers, but often breaks before that. If the belt breaks, the rockers can be damaged, resulting in costly repairs.
Balancer Shaft Belt
The balance shaft belt lasts approximately 50,000 km. If it breaks, it can get caught under the timing belt, which is also dangerous for the engine.
Engine pulleys
Pulleys bursting, especially the one on the crankshaft, is another common problem. This requires pulleys to be replaced and can affect engine performance.
Cracks in the block head
At high mileage, cracks often appear in the area of the block head’s foramen. This can lead to coolant leaks and poor engine performance.
Low turbine life
Turbocharged versions of engines (e.g. 4D68T and 4D65T) are notorious for low turbine life. The turbine may need to be replaced at a mileage of about 100,000 km.
EGR valve clogging
The exhaust gas recirculation (EGR) valve quickly becomes clogged with carbon deposits, which reduces engine efficiency and requires regular cleaning or replacement of the valve.
Mitsubishi 4D68 and 4D65 engines were reliable and popular diesel vehicle solutions of their time. They offered a good balance between power and economy, as well as ease of maintenance. Despite their years, these engines still find use in older models of Mitsubishi vehicles, proving their durability and reliability.