Engine Overview and Common Failures
The M57 engine number is located near the oil filter. The weight of the complete M57 engine is 210 kg. First generation of this diesel engine was equipped with steel intake swirl flaps, which could detach and fall into the engine cylinders, which usually resulted in a fatal outcome. With the upgrade, plastic flaps were introduced and they are relatively safe. The fuel system uses Bosch Common Rail system with electromagnetic injectors, which is highly reliable and has a long service life. It is important not to compromise on fuel quality and maintenance. On high mileage, leaks in the pressure regulator on the rail and failure of the main pump (sometimes it is sufficient to simply replace its filter) can occur periodically. The turbocharger itself is quite durable and does not cause much trouble, but problems with boost are usually related to cracks in vacuum tubes or a clogged pressure regulator. It should be noted that the turbocharger can leak oil if the crankcase ventilation is faulty. The timing chains of the engines from the first two generations last for a very long time, sometimes more than 500,000 km, but the engines of the third generation were upgraded and received a new timing drive, which may require replacement before reaching 300,000 km, and it is not cheap. Other malfunctions include occasional leaks in the plastic coolant pipes, thermostat failures, viscous fan clutch, damper pulley, or glow plug control unit. It is also worth noting that the second generation of the engine had a steel exhaust manifold and it often cracked, while the first and third generations were equipped with a cast iron manifold.