2006 – 2012 BMW E90 3.0 (N52 Engine) 3.0 Harmonic Balancer (Damper Pulley)
Model • Year • Description /
BMW128 • 08-13 • AT / BM325I • 06 • Sedan; SW, AT / BMW328 • 07-11 • AT / BMW328 • 12-13 •3.0L (6 cyl), AT / BMW330 • 06 •Sedan, AT / BMW525 • 06-07 • AT / B528I • 08-10 • AT / BMW530 • 06-07 • AT / BMWX3 • 07-10 • AT / BMWX5 • 07-08 • 3.0L, w/o Adaptive Drive / BMWX5 • 09-10 • 3.0L, gasoline, w/o Adaptive Drive / BMW Z4 • 06-08 • 3.0L, AT / BMW Z4 • 09-11 • (Roadster), sDrive 30i (3.0L), AT
E60 / E61 / E88 / E82 / E90 / E91 / E92 / E93
WHAT DOES IT DO?
A harmonic balancer (also called crank pulley damper, crankshaft damper, torsional damper, or vibration damper) is a device connected to the crankshaft of an engine to reduce torsional vibration and serves as a pulley for drive belts, a device fitted to the free (accessory drive) end of the crankshaft of an internal combustion engine. It is essential in engines with long crankshafts and is present on most engines as it reduces torsional vibrations that tend to peak at certain speeds. Torsional vibrations can greatly reduce crankshaft life, if not cause instantaneous failure, if the crankshaft runs at or through resonance. Because of this, dampers are designed with a specific weight and diameter to reduce mechanical Q factor, or damp, crankshaft resonances. Factory dampers are often re-sized in the same basic engine with any factory modification of crankshaft material, thickness, weight, or throw