The Mitsubishi 4N14 is a 2.2-liter diesel engine that has been available since 2010 and is fitted to a number of popular car models such as the Outlander, ASX and Delica D:5. This engine features state-of-the-art technology including the MIVEC phase control system, variable geometry turbine and Common Rail injection system. The 4N14 engine has established itself as a powerful and economical unit, but has a number of features and problems that should be taken into account during operation.
Mitsubishi 4N14 engine specifications
| Characteristics | Reference |
|---|---|
| Modification | 4N14 MIVEC 2.2 Di-D 16v |
| Volume | 2268 cm³ |
| Power | 150 – 177 hp |
| Torque | 360 – 380 Nm |
| Power system | Common Rail |
| Compression ratio | 14.9 |
| Cylinder diameter | 86 mm |
| Piston stroke | 97.6 mm |
| Cylinder block | Aluminum |
| Cylinder head | Aluminum, 16 valves |
| Transmission timing | Chain |
| Fasor regulator | MIVEC |
| Turbocharger | Variable geometry turbine |
| Oil | 7.5 liters, 5W-30 |
| Environmental class | Euro 5/6 |
| Example service life | 350,000 km |
The 4N14 engine has been designed using modern technology, making it efficient and environmentally friendly. However, its design also implies high sensitivity to fuel quality and the need for regular maintenance.
Which vehicles are fitted with the 4N14 engine.
| Vehicle Model | Production period |
|---|---|
| Mitsubishi ASX 1 (GA) | 2013 – present |
| Delica D:5 (CV) | 2013 – present |
| Outlander 2 (CW) | 2010 – 2012 |
| Outlander 3 (GF) | 2012 – 2022 |
| L200 5 (KK) | 2018 – 2024 |
The 4N14 engine is installed in vehicles of various classes, from crossovers such as Outlander and ASX to commercial vehicles including Delica and L200. This confirms its versatility and high performance in different operating conditions.
Main engine problems and shortcomings
Although the 4N14 engine demonstrates good performance and life, there are some peculiarities and problems faced by owners:
- Engine rumbling. Diesel engines have a naturally “loud” sound, but in the case of the 4N14, some owners have noted a particularly strong sound.
- Solar oil leaking into the oil when the particulate filter is burned. During the particulate filter cleaning process, diesel fuel can penetrate the engine crankcase, causing the oil to liquefy and reduce its efficiency.
- Piezo injectors. These injectors are high-tech, but are extremely demanding to fuel quality. In the Russian market, where the quality of fuel can be low, injectors can fail earlier than expected – sometimes up to 100,000 km of mileage.
- Clogging of the EGR valve and intake flaps. Over time, exhaust fouling clogs the EGR system and intake flaps, resulting in reduced engine power and poor idling performance.
- Adjustment of valve thermal clearances. Every 45,000 kilometers, it is necessary to perform valve clearance adjustment, which requires removing the injectors, which increases the complexity and cost of maintenance.
Piezo injectors and their problems
One of the key technologies used in the 4N14 engine are piezo injectors. They provide more precise and faster fuel injection control than conventional injectors, which improves engine economy and environmental friendliness. However, their main problem is their high sensitivity to diesel fuel quality.
Piezo injectors are difficult to repair and can fail when using poor quality fuel. Replacing these injectors is an expensive procedure, which adds to the operating costs for owners of vehicles with the 4N14 engine.
Variable Geometry Turbine
Another feature of this engine is the presence of a variable geometry turbine (VGT). This turbine allows an optimal boost level to be maintained at different loads, which improves engine performance, especially at low speeds. However, like injectors, the variable geometry turbine is sensitive to fuel quality. Bad fuel causes clogging of the turbine’s mechanisms, which can cause a reduction in power and the need for repairs.
Particulate Filter and Maintenance
The particulate filter fitted to the 4N14 cleans soot from the exhaust gases, making the engine comply with the strict EURO 5 and EURO 6 environmental standards. However, clogging of the particulate filter reduces engine power and puts more strain on the engine’s systems. An important aspect is the need to burn the filter regularly, which reduces the likelihood of clogging.
How reliable is the Mitsubishi 4N14?
The Mitsubishi 4N14 engine is a modern and high-tech diesel unit that provides excellent dynamic and environmental performance. It is installed on a wide range of cars and has a significant resource – up to 350,000 km. Nevertheless, high requirements to fuel quality and complexity of maintenance of piezo injectors and turbocharging system can cause problems for owners, especially when operating in conditions where diesel fuel does not always meet high standards.