GMB 480-9850 Engine Timing Belt Idler

Engine Timing Belt Idler for Audi and Volkswagen

The GMB 480-9850 engine timing belt idler is built to meet or exceed OEM specifications for precise belt routing and stable operation. It is a direct-fit replacement for select Audi and Volkswagen applications, including Audi A4, A6, S4, RS4, Allroad Quattro, and Volkswagen Passat models.

• Engine timing belt idler for valve train service
• Manufactured to meet or exceed OEM specifications
• Metal pulley construction for durability
• Serpentine and V-belt pulley type
• 1 mm drive belt pulley diameter specification
• 1-groove pulley design
• Fits select 1998-2005 Audi and Volkswagen applications

Fitment and Application Details

Compatible With 1998-2001 Audi A4, N/A; 1998-2001 Audi A4 Quattro, N/A; 1998-2001 Audi A6, N/A; 1998-2004 Audi A6 Quattro, N/A; 2000-2002 Audi S4, N/A; 2001-2005 Audi Allroad Quattro, N/A; 2002 Audi RS4, N/A; and 1998-2005 Volkswagen Passat, N/A. The GMB 480-9850 is a practical replacement choice when servicing timing belt components on Audi A4 and Audi A6 platforms, as well as Passat applications that require this idler configuration.

This part cross-references Gates T41227 for the same application.

What This Part Helps Address

• Timing belt tracking concerns caused by a worn idler pulley
• Belt noise from rough or damaged pulley surfaces
• Uneven belt wear from pulley misalignment or bearing wear
• Service replacement for aging timing belt hardware
• Restoration of proper belt guidance in the engine timing system

Installation Notes and Tips

Replace the idler during timing belt service and verify pulley alignment before final assembly. Inspect the belt path, adjacent rollers, and related timing components for wear, and confirm the part number matches the vehicle application before installation. For Audi A4, A6, S4, RS4, Allroad Quattro, and Volkswagen Passat repairs, accurate timing system setup is essential for proper engine operation.

Quality Assurance

GMB manufactures this timing belt idler to meet or exceed OEM specifications, supporting consistent fit and function for the listed applications. Part number 480-9850 is intended for direct replacement use in the specified Audi and Volkswagen fitments.