Gates T42010 Engine Timing Belt Idler Pulley - Upper

Gates Timing Belt Idler Pulley T42010

The Gates T42010 timing belt idler pulley is a smooth-backside pulley built for upper timing belt applications on select Mazda, Ford, and related engines. It uses a plastic construction with a 60 mm outside diameter, 33 mm width, and 10.3 mm inside diameter for the specified engine layouts.

Gates PowerGrip idler pulleys are offered as fixed idlers or as replacements for tensioner bracket applications, with smooth or grooved contact surfaces depending on the engine design. This Gates timing belt pulley is the smooth/backside style used in upper timing belt routing.

Key Features

• Brand: Gates Timing Belt Pulley line
• Part number: T42010
• Plastic pulley construction
• Smooth/backside contact surface
• Outside diameter: 60 mm
• Width: 33 mm
• Inside diameter: 10.3 mm
• Flanged end: No
• Contents: Pulley

Detailed Description

Gates T42010 is an engine timing belt idler pulley for upper timing belt applications where a smooth backside pulley is required. It is listed for Mazda 626, Mazda Millenia, Mazda MX-6, Mazda MX-3, and Ford Probe applications, including 1993-2002 Mazda 626 upper timing belt pulley service and 1993-1997 Ford Probe upper timing belt pulley service. The Gates T42010 also appears in Mazda Millenia and Mazda MX-6 upper timing belt applications, making it a direct-match service part for the specified engine layouts.

This part cross-references GMB 445-8520 for the same application.

What It Helps Address

• Timing belt tracking issues caused by a worn idler pulley
• Noise from a rough or failing pulley bearing
• Uneven belt wear at the upper timing belt path
• Service replacement for a damaged smooth-backside pulley
• Restoration of proper belt routing on Mazda and Ford timing systems

Installation Notes

Verify pulley dimensions, contact surface type, and upper mounting position before installation. Confirm the engine uses a smooth/backside idler pulley and compare the old part to the Gates T42010 before assembly. For Mazda 626, Mazda Millenia, Mazda MX-6, Mazda MX-3, and Ford Probe timing belt service, inspect the belt, tensioner, and adjacent pulleys at the same time to avoid repeat labor.

Quality Assurance

Gates PowerGrip idler pulleys are engineered for timing system service and are offered in fixed-idler and tensioner-bracket replacement styles. The T42010 follows the listed dimensional and application specifications for the confirmed fitments.