Dayco 89051 Accessory Drive Belt Tensioner Pulley

Accessory Drive Belt Tensioner Pulley Overview

The Dayco 89051 accessory drive belt tensioner pulley is built for serpentine belt systems that require a 6-rib grooved pulley. With a steel construction and a single bearing design, it supports smooth belt tracking in a wide range of Ford, Chevrolet, GMC, Chrysler, Honda, and other vehicle applications.

Use this Dayco 89051 pulley when servicing accessory drive belt tensioner assemblies on vehicles such as the Ford F-150, Ford Mustang, Chevrolet Silverado 2500 HD, and GMC Sierra 3500 HD. It is also listed for select applications with aftermarket tensioners and dual alternator setups.

Key Features

• Steel pulley construction for accessory drive belt service
• 6-groove design for serpentine belt systems
• Single bearing layout for smooth rotation
• 17 mm bearing inner diameter and 12 mm bearing width
• 30.1 mm overall dimension with 76 mm reference dimension
• Flat: No
• Max belt width: 6 rib

Detailed Product Description

Dayco 89051 is an accessory drive belt tensioner pulley engineered for grooved serpentine belt routing. The steel pulley body and single-bearing design are suited to applications that rely on stable belt contact and consistent pulley alignment. This part number cross-references Motorcraft YS249 for the same application.

Fitment coverage includes 2002-2018 Ford E-350 Super Duty, 2002-2010 Ford F-250 Super Duty, 2002-2010 Ford F-350 Super Duty, 2002-2008 Ford F-150, 1994-2004 Ford Mustang, 2006-2016 Chevrolet Express 2500, and 2002-2016 GMC Sierra 2500 HD. It also appears in select Honda S2000 applications and other listed vehicles with grooved pulley or aftermarket tensioner requirements.

Common Problems This Part Addresses

• Worn or noisy tensioner pulley bearing
• Serpentine belt tracking issues caused by pulley wear
• Belt chirp or squeal from rough pulley rotation
• Accessory drive belt vibration from an aging pulley surface
• Service replacement for grooved pulley applications on Ford, Chevrolet, GMC, and Honda models

Installation Notes and Tips

Verify pulley style, groove count, and bearing dimensions before installation. This part is listed for multiple positions, including grooved pulley, alternator, upper, supercharger, and air conditioning applications, so match the vehicle’s original routing and tensioner configuration. Several fitments note use with aftermarket tensioners or vehicles without air conditioning, including select Ford E-Series, F-Series, and Mustang applications.

For best results, inspect the serpentine belt, tensioner arm, and adjacent idlers during service. Replace any worn belt or damaged tensioner components at the same time to maintain proper belt alignment.

Quality Assurance

Dayco is a recognized name in accessory drive components, and this pulley is built to the listed material and dimensional specifications for direct-fit service in confirmed applications.