Vemo V20-23-0001 Alternator Pulley

Alternator Pulley for BMW Charging Systems

The Vemo V20-23-0001 alternator pulley is a direct-fit replacement for select BMW charging system applications. Built with a 6-rib design, clockwise rotation, and an M16 thread size, it is specified for BMW 128i, 328i, 328i xDrive, X3, X5, and Z4 models across multiple years.

Key Features

• Part number: V20-23-0001
• Alternator pulley for BMW electrical, charging, and starting systems
• 6-rib belt interface for the listed applications
• Clockwise rotation
• Torx bolt head/nut design
• Bore diameter: 17 mm
• Diameter: 49 mm
• Thread size: M16
• Requires special tools for mounting

Detailed Description

VEMO V20-23-0001 is an alternator pulley engineered for BMW vehicles that use the specified pulley dimensions and drive configuration. The pulley measures 49 mm in diameter, 55 mm in width, 34 mm in height, and 54 mm in length, with a 17 mm bore and 11.1 mm depth. Its 6-rib profile and clockwise rotation match the listed BMW charging system applications, helping maintain proper belt engagement and alternator drive operation. VEMO is the brand line used for this OE-style replacement component, and this part cross-references BMW OE numbers such as 12 31 4 466 273 and 12 31 7 516 103 for the same application.

Vehicle Fitment

• Fits 2010-2013 BMW 128i, N/A. Notes: Grade: OEM - Made in Germany (Q+); VEMO
• Fits 2013 BMW 128i, N/A. Notes: Grade: OEM - Made in Germany (Q+); Bosch Alternator; VEMO
• Fits 2010-2013 BMW 328i, N/A. Notes: Grade: OEM - Made in Germany (Q+); VEMO
• Fits 2010-2013 BMW 328i xDrive, N/A. Notes: Grade: OEM - Made in Germany (Q+); VEMO
• Fits 2011-2012 BMW 128i, N/A. Notes: Grade: OEM - Made in Germany (Q+); Bosch Alternator; Vendor:BOSCH; VEMO
• Fits 2010 BMW 128i, N/A. Notes: Grade: OEM - Made in Germany (Q+); Diameter-49mm; VEMO
• Fits 2010 BMW 328i, N/A. Notes: Grade: OEM - Made in Germany (Q+); Diameter-49mm; VEMO
• Fits 2010 BMW 328i xDrive, N/A. Notes: Grade: OEM - Made in Germany (Q+); Diameter-49mm; VEMO
• Fits 2009-2010 BMW X3, N/A. Notes: Grade: OEM - Made in Germany (Q+); VEMO
• Fits 2010 BMW X5, N/A. Notes: Grade: OEM - Made in Germany (Q+); 6 Rib; Vendor:BOSCH; VEMO
• Fits 2007-2009 BMW X5, N/A. Notes: Grade: OEM - Made in Germany (Q+); 6 Rib; VEMO
• Fits 2006-2008 BMW Z4, N/A. Notes: Grade: OEM - Made in Germany (Q+); VEMO

Common Uses

• Replacing a worn or noisy alternator pulley on BMW 128i, 328i, or 328i xDrive models
• Restoring proper belt drive engagement in BMW X3, X5, and Z4 charging systems
• Addressing pulley wear that can contribute to charging irregularities
• Correcting belt tracking concerns tied to pulley dimension or rib mismatch
• Servicing alternator drive components during charging system repair

Installation Notes

Installation requires special tools for mounting. Confirm the pulley diameter, rib count, rotation direction, bore size, and thread size against the original part before installation. This part number, V20-23-0001, is intended for the listed BMW applications and should be matched to the alternator type noted in the fitment details, including Bosch-equipped vehicles where specified.

Quality Assurance

VEMO V20-23-0001 is listed with OEM-grade fitment references and application-specific dimensions for the covered BMW models. The part is built for the charging system requirements shown in the fitment data and is identified by OE cross-reference numbers for direct replacement selection.