Gates 90K-38315 Serpentine Belt Drive Component Kit - Alternator and Water Pump, Alternator or Water Pump and Power Steering

Accessory Belt Drive Kit for Volkswagen and Audi

The Gates Accessory Belt Drive Kit 90K-38315 is a complete serpentine belt drive service kit for select Volkswagen and Audi applications. It combines the belt, tensioner, and idler pulleys into one repair solution to help restore proper accessory drive operation on vehicles such as the Volkswagen Jetta, Volkswagen Golf, and Audi TT RS Quattro.

Key Features

• OE-equivalent serpentine belt included for direct replacement service
• Includes tensioner assembly and idler pulleys for full accessory drive renewal
• Belt dimensions: 42.375 in. outside circumference and 0.667 in. top width
• Belt part number: K050418
• Tensioner assembly part number: 38315
• Idler pulley part numbers: 36105 and 36106
• Fits select Volkswagen Golf, Golf SportWagen, Bora, and Jetta applications
• Fits select Audi TT RS Quattro applications

Product Details

Gates Accessory Belt Drive Kit 90K-38315 is built to service the complete serpentine drive system rather than replacing only the belt. Gates notes that renewing the belt, tensioner, and idler pulleys together helps address wear across the front-end accessory drive and supports a more complete repair. This kit is a practical choice for Volkswagen Jetta and Volkswagen Golf owners, as well as Audi TT RS Quattro applications, where the accessory drive powers critical engine-driven components.

This part cross-references Gates 90K-38315 for the same application.

Common Problems This Kit Can Address

• Squealing or chirping from the serpentine drive area
• Visible belt wear, cracking, or glazing
• Weak or noisy tensioner operation
• Idler pulley noise or rough rotation
• Repeated belt service caused by worn accessory drive components

Installation Notes and Tips

Verify the belt routing and component alignment before installation. Gates includes installation instructions and tech tips with this kit to support accurate service. For best results, inspect the accessory drive path for pulley wear, tensioner movement, and any signs of contamination before completing the repair.

• Fits 2010-2014 Volkswagen Golf, Alternator and Water Pump
• Fits 2011-2013 Audi TT RS Quattro, Alternator, Water Pump and Power Steering
• Fits 2010-2013 Volkswagen Golf SportWagen, Alternator and Water Pump
• Fits 2005-2010 Volkswagen Bora, Alternator and Water Pump
• Fits 2005-2010 Volkswagen Jetta, Alternator and Water Pump

Quality Assurance

Gates designs this accessory belt drive kit as an OE-equivalent service solution for the listed applications. The kit format supports a complete front-end accessory drive repair using matched components for the specified Volkswagen and Audi fitments.