Dayco 89646 Automatic Drive Belt Tensioner Assembly

The Dayco 89646 Automatic Belt Tensioner is engineered to maintain constant tension on serpentine belt drives, ensuring optimal accessory performance and extended belt life. This tensioner assembly features Dayco's original patented flat spring design that provides less operating range variation compared to traditional coil spring tensioners, reducing the risk of premature accessory bearing failure due to high tension.

Key Features:

• Patented flat spring design for consistent tension control throughout service life
• PTFE string wound within spring resists abrasion and dampens noise
• Heavy-duty cast aluminum spring case and arm resist cracking and fatigue
• Flat spring coating resists rust and corrosion
• Reduces risk of belt noise, slippage, and poor accessory performance
• Designed to meet or exceed OEM specifications

Dayco automatic belt tensioners are built to endure the toughest operating conditions while promoting quieter performance. The robust construction with cast aluminum components offers additional strength and lessens the risk of distortion under demanding engine bay environments. This complete tensioner assembly includes the spring, arm, and pulley for direct replacement installation.