Dayco 89677 No Slack Automatic Belt Tensioner Assembly

The Dayco 89677 No Slack Automatic Belt Tensioner is engineered to maintain constant tension on serpentine belt drives, eliminating belt squeal, improper tracking, and accessory performance issues. This premium tensioner assembly is designed for automotive and light truck applications.

Key Features:

• Patented flat spring technology provides consistent tension throughout belt life, compensating for stretch and wear
• Heavy-duty cast aluminum spring case and arm resist cracking, fatigue, and distortion
• PTFE string wound within spring resists abrasion and dampens noise
• Rust-resistant coated flat spring for extended durability
• Steel locator pins and arm plates for enhanced stability
• Smooth pulley design for optimal belt contact
• Thermoplastic rubber spring slot plugs and O-ring seals keep out contaminants
• Zinc-coated mounting bolt resists corrosion

This tensioner reduces the risk of premature accessory bearing failure caused by excessive tension when installing new belts, while preventing belt noise and slippage from low tension as belts wear. Built to outperform and outlast OEM parts, the Dayco 89677 delivers quieter operation and longer service life in demanding conditions.