The crankshaft pulley, also named harmonic balancer, crank pulley damper, crankshaft damper, torsional damper or vibration damper. The crankshaft pulley is designed to turn the belts that operate the engine and other accessories. It connects to a serpentine belt or separate belts for the A/C and alternator. However, the crankshaft pulley in every car can become faulty over time owing to long time usage and heat. It is common to have some non-working engine accessories and a loud knocking noise from a failing crankshaft pulley. Before the replacement, you'd better to check the rubber insert located between the center and outside section of the pulley, since the rubber can be worn or damaged over the time. You know you can save a huge amount of money by shopping here and replacing it by yourself. We are glad to offer you all BMW genuine OEM crankshaft pulley with a discounted price.