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The engine timing crankshaft sprocket on a BMW Mini or Peugeot vehicle is a key element in the engine's timing machine. It is responsible for riding the timing chain or belt, which controls the timing of the engine's valves and pistons.

The sprocket is usually positioned at the crankshaft, that's the main rotating shaft inside the engine. It is normally secured in place with a bolt and keyway to make sure proper alignment and synchronization with other engine additives.