The problem has to do with aluminum bolts in the variable camshaft timing adjustment unit, a setup that BMW calls VANOS. This part helps determine when the engine’s valves open and close.

The N52 engine uses four of them, and the part number of the VANOS housing bolt is 8602263 in BMW's parts system. Regarding the 155,627 affected vehicles, the list kicks off with the Z4 sDrive30i ...

Another notable issue is vanos bolt failure ... which can seriously impact engine performance. While BMW has acknowledged this issue in some of its models, it has not issued a recall for ...

The BMW S65, a 4.0-liter naturally ... explainer on how to rebuild an engine: which parts go where, what each part does, and even the precise degree every bolt should be torqued.

Bolts within the engine's VANOS setup could break and cause the vehicle to stall while in motion By Keith Barry BMW is recalling 2010-2012 1 Series coupes and convertibles; 6 Series coupes and ...