Dayco 89660 No Slack Automatic Belt Tensioner Assembly

The Dayco 89660 is an automatic accessory drive belt tensioner assembly engineered to maintain constant tension on serpentine belt drives throughout the life of your belt. Part of Dayco's No Slack line, this tensioner features patented flat spring technology that allows for increased torque transmission when needed, automatically compensating for belt stretch and wear while maintaining consistent tension.

Key Features:

• Flat wire spring design provides concentric internal tension for constant belt tension
• Cast aluminum housing and arm construction resists cracking and corrosion
• Steel locator pin ensures precise installation and correct tensioner positioning
• Deflected arm plate reduces rotational movement and extends service life
• Smooth pulley design with 70mm diameter and 25mm width
• Counter-clockwise rotation direction
• Engineered to outperform and outlast OEM specifications

This complete tensioner assembly is designed to eliminate belt squeal, improper tracking, and accessory failure caused by worn or failing tensioners. The robust construction and advanced engineering make it ideal for demanding automotive applications where reliability is critical.

Replaces OEM Numbers: Toyota 16620-0V010, 16620-0V020, 16620-36010

Interchange Numbers: Gates 39096, 39106; ACDelco 39096, 39106; Duralast 305660; Goodyear 49438, 49449; Continental Elite 49438; Bando 780099; Litens 999912A