GMB 445-8520 Engine Timing Idler - Upper

Engine Timing Idler for Mazda and Ford Applications

GMB 445-8520 is an engine timing idler built for upper-position applications on select Mazda and Ford vehicles. Manufactured to meet or exceed OEM specifications, it supports proper belt routing and stable pulley operation in timing-driven engine systems.

Compatible With 1992-2002 Mazda MX-3, MX-6, 626, Millenia, and 1993-1997 Ford Probe upper timing applications. This part number, 445-8520, is also referenced in aftermarket catalogs for the same application.

Key Features

• Engine timing idler for upper mounting positions
• Metal pulley construction for durability
• Serpentine and V-belt pulley type
• Single-groove pulley design
• Built to meet or exceed OEM specifications
• Cross-reference: Gates T42010

Detailed Product Overview

GMB 445-8520 is a timing idler pulley used in the engine valve train area to guide and maintain belt path alignment. The metal pulley design and single-groove configuration support consistent belt tracking in upper timing applications across select Mazda 626, Mazda Millenia, Mazda MX-6, Mazda MX-3, and Ford Probe models. If you are replacing a worn upper timing idler on a 1993-2002 Mazda 626 or a 1995-2002 Mazda Millenia, this part number 445-8520 matches the listed application range.

This part cross-references Gates T42010 for the same application.

Common Issues This Part Can Address

• Noise from a worn or rough idler pulley
• Belt misalignment in the upper timing path
• Visible pulley wear or surface damage
• Uneven belt tracking on serpentine or V-belt systems
• Replacement needs during timing system service

Installation Notes and Tips

Verify the vehicle year, make, model, and upper position before ordering. Compare the original pulley diameter, groove style, and mounting location to the existing part to confirm a proper match for Mazda 626, Mazda Millenia, Mazda MX-6, Mazda MX-3, or Ford Probe applications. Inspect the surrounding belt path and related components for wear before installation.

Quality Assurance

GMB manufactures this timing idler to meet or exceed OEM specifications, providing an OE-style replacement for select upper timing applications.