Dayco 89717 No Slack Automatic Belt Tensioner Assembly

The Dayco 89717 No Slack Automatic Belt Tensioner Assembly is engineered to maintain constant tension on serpentine belt drives, ensuring optimal performance of your vehicle's accessory drive system. This tensioner features Dayco's proven flat spring technology that provides consistent operating range with minimal tension variations throughout the belt's service life.

Key Features:

• Flat spring design compensates for belt stretch and wear automatically
• Cast aluminum housing and arm for durability and heat dissipation
• Steel locator pins and arm plates for precise alignment
• Smooth pulley design for quiet operation
• Resolves common belt issues including squeal, improper tracking, and slippage
• OE-quality construction engineered to meet or exceed original equipment specifications

This accessory drive belt tensioner assembly is designed for gasoline engines and includes the complete tensioner unit with pulley. The automatic tensioning mechanism increases torque transmission to the belt when needed, maintaining proper tension and extending belt life while reducing noise and preventing premature wear on engine accessories.