Keep the accessory drive belt tracking true and running quietly with the INA US Accessory Drive Belt Idler Pulley FP03421, an INA BDC front-end auxiliary drive (FEAD) pulley that drops in as a direct-fit replacement for the listed 2004-2011 BMW V8-4.4L and V8-4.8L applications. Mounted in the accessory belt path, it spins on its bearing to guide and support the belt, helping maintain proper tension and alignment while limiting vibration and noise.
- FEAD design: engineered for effective vibration damping within the tight installation spaces of today's high-load engines.
- Precision bearing: filled with speed- and temperature-matched lubricant intended to support bearing life and consistent rotation.
- Smoother, quieter drive: helps manage belt tension and reduce vibration for calmer engine accessory operation.
- Belt support: provides essential support to the accessory drive belt system, helping reduce belt wear when the pulley is in good condition.
A worn idler bearing often shows up as a whine, growl, or rumble from the belt area, belt squeal, or roughness and play when the pulley is turned by hand. If a failing idler pulley is the cause, this replaces it. Country of origin: Germany.
Fitment: 2004-2006 BMW 545i (V8-4.4L); 2004-2005 BMW 645Ci (V8-4.4L); 2004-2005 BMW 745i (V8-4.4L); 2004-2005 BMW 745Li (V8-4.4L); 2004-2006 BMW X5 (V8-4.4L and V8-4.8L); 2006-2010 BMW 550i (V8-4.8L); 2006-2011 BMW 650Ci (V8-4.8L); 2006-2010 BMW 650i (V8-4.8L); 2006-2009 BMW 750i (V8-4.8L); 2006-2008 BMW 750Li (V8-4.8L); 2009 BMW 750Li (V8-4.4L).
Manufacturer part number FP03421.
This part cross-references / interchanges with the following part numbers:
11 28 1 440 237, 11 28 7 549 557, 1 440 237, 7 549 557, 50054, APV3219, 55062, 36483, 7803-21583, T36483, 5320342100, 15-3132, VKM 38351, V20-3214
