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Timing chain failure may call for engine replacement or a costly repair. The most seriously affected units which require the most extensive repairs were produced from 01.03.2007 to 05.01.2009. [4] However, there have been reports of timing chain failure in BMW diesel engines manufactured until 2015.
The earliest versions of the M42 developed problems with the timing chain. The hydraulic tensioner, [6] chain guides, idler wheel and rear lower chain case were updated to resolve wear problems experienced in the early versions of the M42. [7] The updated cam chain tensioner is shared with that of the later M44 engine. [8]
Aside from the belt/chain itself, also common is a failure of the tensioner, and/or the various gear and idler bearings, causing the belt/chain to derail. Furthermore, in engines where the timing belt drives the water pump, failure of the water pump can cause the pump to seize, which can break the timing belt or chain.
In 2011, as part of BMW's shift to turbocharging, the N43 was replaced by the BMW N13 turbocharged four-cylinder engine. The N43 suffered various problems in service - breakage of the cam chain plastic guides leading to oil starvation as the debris blocked the oil strainer, and problems with the injectors, coil packs and the NOx sensor.
The BMW M57 is a straight-6 diesel engine produced from 1998 up to 2013 in BMW's upper Austrian ... valves as well as two chain-driven ... common problems.
A successor to the BMW M60, the M62 features an aluminium engine block [2] and a single row timing chain. [3] In 1998, a Technical Update included VANOS (variable valve timing) for the intake camshafts. The S62 engine is the BMW M high performance version of the M62, which was released in the E39 M5, BMW Z8, Ascari KZ1, and the Ascari A10.
The B48 engine was revised in 2018, dubbed "B48TU" ("Technical Update"), with notable changes and improvements; a new one-part timing chain as opposed to the earlier two-part, a new separate cooling circuits for the cylinder head and crankcase, and forged conrods and forged crankshaft is now 2.03 lb (1 kg) lighter due to the use of lighter ...
The S63 is the BMW M version of the N63, which debuted in the BMW X6 M and was used in the BMW M5 models from 2011 to 2023. The S63 uses two twin-scroll turbochargers plus a pulse tuned, cross-engine exhaust manifold [ 8 ] to keep constant exhaust pulses flowing to the turbos at every 180 degree rotation.