Dayco 89108 Accessory Drive Belt Tensioner Pulley

Accessory Drive Belt Tensioner Pulley Overview

Dayco 89108 is an accessory drive belt tensioner pulley built for serpentine belt systems. It uses a polymer pulley construction with a 10-groove profile and dual bearings to support smooth belt tracking in the accessory drive system.

For Volvo applications that use this style of tensioner pulley, Dayco 89108 provides a direct replacement option for maintaining proper belt routing and tensioner operation.

Key Features

• Accessory drive belt tensioner pulley for serpentine belt systems
• Polymer pulley material for lightweight construction
• 10-groove design for multi-rib serpentine belts
• Dual bearings with 17 mm inner diameter on each bearing
• Bearing width: 24 mm
• Maximum belt width: 10 rib
• Part number: 89108

Detailed Product Description

Dayco 89108 is engineered as a tensioner pulley for the accessory drive belt system, where consistent pulley alignment and bearing support are critical to belt performance. The pulley measures 74 mm in one dimension and 39.4 mm in the other, with a 10-groove serpentine belt profile and two bearings to help maintain stable rotation under accessory drive loads. This makes it a practical replacement for Volvo belt drive service and other applications that call for the same pulley specification.

This part cross-references Gates 36098 for the same application. The Dayco 89108 part number is also commonly searched alongside Volvo 3164793 and Volvo 20461114 when matching the correct accessory drive belt tensioner pulley.

Common Problems This Part Can Address

• Noise from a worn or rough tensioner pulley bearing
• Belt tracking issues caused by pulley wear
• Serpentine belt vibration from inconsistent pulley rotation
• Accessory drive belt slippage related to pulley surface wear
• Reduced belt system reliability from a damaged pulley assembly

Installation Notes and Tips

Verify pulley groove count, belt width, and bearing dimensions before installation. Confirm the pulley matches the vehicle’s accessory drive belt system layout and compare the old part to Dayco 89108 for diameter, width, and bearing configuration. For Volvo belt service, inspect the serpentine belt, tensioner arm, and adjacent pulleys at the same time to avoid repeat repairs.

Quality Assurance

Dayco is a recognized name in belt drive components, and this pulley is built to meet the dimensional and functional requirements of the accessory drive system. Confirm fitment by part number and pulley specifications before ordering.