BMW N57 3.0 Engine Rebuild
Common BMW N57 3.0 Engine Failures
The BMW N57 3.0 diesel engine (6 cylinder) shares similar failures with the 4 cylinder N47 engine.
The N57 3.0 engines also suffer from timing failure, the resulting damage is also similar: the timing chain can stretch or snap causing damage to rocker arms, cam carrier, vales and guides. The turbocharger failures are not specific to a single variation of this platform and can occur on any. Some of these examples are engines that have not been maintained with regular oil changes. These cases are usually a little more severe and we have seen crankshaft failure and spun bearings. More often the plastic timing guides leave small fragments which make their way down and can block oil feed and galleries, therefore causing turbocharger failure and like most engine failures this can cause multiple following failures in the form of oil starvation etc.
Another failure we have encountered is over-fuelling fuel injectors, this causes the pistons themselves to melt.
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BMW 3.0 Diesel Engine (N57)
In 2008 BMW released the N57 3.0 6 cylinder diesel engine to replace the older generation M57 engine. Most commonly known as the N57D30, this engine was fitted to 3 Series, 5 Series, 7 Series and X Series vehicles in multiple configurations. The N57D30O variants use a single turbocharger while the N57D30T variants use twin turbocharging. There is also a less common N57S variant which utilizes 3 turbochargers of different sizes. The engine block is made from aluminium as opposed to a more conventional graphite iron block.
Although the N57 3.0 engine is what we call a repairable engine compared to other engines we have encountered, a bottom end failure is still very possible and can cause engine block damage. This means an engine surcharge is slightly more common than with the 4 cylinder N47. Even still a complete engine rebuild is very conventional and we commonly work on this engine here at Dieselheads.