Alternator Decoupler Pulley for BMW

This URO alternator decoupler pulley is a direct-fit replacement for select BMW charging system applications. It restores proper alternator pulley function on vehicles such as the BMW 128i, BMW 328i, and BMW 525i while helping reduce repair cost versus replacing the complete alternator assembly.

• Direct-fit alternator decoupler pulley for select BMW applications
• Manufactured to OE pulley dimensions for correct belt alignment and clearances
• High-strength alloy or composite construction for heat and belt vibration resistance
• Corrosion-resistant surface coating on metal versions
• Backed by a 24 month unlimited mileage warranty
• Part number 12317516105 for easy identification

Fitment Details

• Fits 2008-2013 BMW 128i, N/A, d=55mm
• Fits 2010 BMW 328i, N/A, only for use with Valeo alternator
• Fits 2009-2010 BMW 328i xDrive, N/A, only for use with Valeo alternator
• Fits 2007-2009 BMW 328i, N/A, d=55mm
• Fits 2007-2008 BMW 328xi, N/A, only for use with Valeo alternator
• Fits 2006-2007 BMW 525i, N/A, d=55mm
• Fits 2006-2007 BMW 525xi, N/A, d=55mm
• Fits 2006-2007 BMW 530i, N/A, d=55mm
• Fits 2006-2007 BMW 530xi, N/A, d=55mm
• Fits 2006 BMW 325i, N/A, d=55mm
• Fits 2006 BMW 325xi, N/A, only for use with Valeo alternator
• Fits 2006 BMW 330i, N/A, d=55mm
• Fits 2006 BMW 330xi, N/A, only for use with Valeo alternator

Common Repair Uses

• Worn or failed alternator pulley
• Belt noise caused by pulley drag or vibration
• Charging system service on BMW 128i, BMW 328i, and BMW 525i models
• Incorrect belt tracking from pulley wear
• Costly alternator replacement when only the pulley has failed

Installation Notes

Verify alternator brand and pulley diameter before ordering. Some listed BMW applications require a Valeo alternator, and others specify a 55 mm pulley diameter. Confirm the original pulley style and belt alignment during installation to ensure proper charging system operation.

Quality Assurance

URO manufactures this alternator decoupler pulley to OE dimensions for proper fit and function. Part number 12317516105 is covered by a 24 month unlimited mileage warranty.