Genuine OEM MINI Engine Crankshaft Pulley, part number 11238602800. This pulley is mounted on the crankshaft and transfers rotational power to drive various engine accessories such as the alternator, power steering pump, and air conditioning compressor. Its precise balance is crucial for smooth engine operation and accessory longevity. Genuine OEM crankshaft pulleys are manufactured to strict tolerances for optimal performance and durability.