Genuine OEM Volkswagen crankshaft pulley, part number 028105243AC. Also known as a vibration damper, this pulley is mounted on the front of the crankshaft. Its primary function is to absorb torsional vibrations generated by the engine's combustion process, thereby reducing stress on the crankshaft and improving engine smoothness. It also serves as a drive pulley for accessory belts such as the alternator and power steering pump. Manufactured to precise specifications for balance and durability. Genuine OEM parts ensure correct engine timing and accessory drive function.