Gates 90K-39390A Serpentine Belt Drive Component Kit

Accessory Belt Drive Kit for Mazda Applications

Restore the accessory belt drive system with the Gates 90K-39390A Accessory Belt Drive Kit (Standard). This kit is built around OE-equivalent service parts for Mazda 3, Mazda 3 Sport, CX-3, and CX-5 applications, helping address belt wear and front-end drive noise with a complete service approach.

The Gates Accessory Belt Drive Kit (Standard) line is focused on replacing the belt drive system as a unit rather than servicing only one wear item. For Mazda 3 and Mazda CX-5 owners, that means a more complete repair strategy for the serpentine drive system.

Key Features

• Gates part number 90K-39390A
• Serpentine Belt Drive Component Kit for accessory drive service
• Includes OE-equivalent belt, tensioner, idler pulley, and necessary hardware with installation instructions and tech tips
• Contents listed as 2 belts and tensioner
• Tensioner assembly part number 39390
• Belt part numbers K060378 and K030309SF
• Outside circumference values listed: 31.7, 38.5, 805, and 978
• Belt top width values listed: .42, .807, 11, and 20

Detailed Description

Gates 90K-39390A is a complete serpentine belt drive component kit for restoring the accessory belt drive system on select Mazda vehicles. It is engineered to service the belt, tensioner, and pulley components together, which helps reduce repeat repairs caused by leaving worn front-end drive parts in place. This kit is a direct fit for 2014-2018 Mazda 3, 2014-2018 Mazda 3 Sport, 2014 and 2016-2017 Mazda CX-5, and 2016-2020 Mazda CX-3 applications, with 2019-2020 Mazda 3 and Mazda 3 Sport W/SKYACTIV coverage also listed.

For buyers searching for a Mazda 3 serpentine belt drive kit, Mazda CX-5 accessory belt drive service parts, or a Gates 90K-39390A replacement kit, this package brings together the major wear items in the accessory drive system. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Squealing or chirping from the accessory belt drive
• Visible belt wear, cracking, or glazing
• Weak or noisy belt tensioner operation
• Idler pulley noise or rough rotation
• Repeat belt replacement caused by worn supporting components

Installation Notes and Tips

Follow the included installation instructions and tech tips for accurate service. Before installation, inspect the belt routing path, pulley surfaces, and surrounding accessory drive components for wear or contamination. Confirm vehicle-specific fitment by year, model, and engine configuration, including W/SKYACTIV listings where noted, before ordering or installation.

Quality Assurance

Gates designs this kit as an OE-equivalent service solution for the accessory belt drive system. The goal is to restore the system with matched components that support accurate, complete maintenance on compatible Mazda applications.