Dayco 89618 No Slack Automatic Belt Tensioner Assembly

The Dayco 89618 No Slack Automatic Belt Tensioner Assembly is engineered to maintain constant tension on serpentine belt drive systems, ensuring optimal performance and longevity. This precision-manufactured tensioner features Dayco's patented flat spring technology that compensates for belt stretch and wear while maintaining consistent tension throughout the belt's service life.

Key Features:

• Patented flat spring design provides less operating range variation in tension, reducing the risk of premature accessory bearing failure
• Heavy-duty cast aluminum spring case and arm resist cracking, fatigue, and distortion for enhanced durability
• Lubricated nylon pivot tube bushing and spring bushing promote quieter operation
• Zinc-coated mounting bolt resists rust and corrosion
• Aluminum retainer ring locks the spring case and arm together while sealing against corrosion
• Thermoplastic rubber spring slot plug keeps out harmful contaminants
• PTFE strip wound within the spring for superior abrasion resistance
• Coated flat spring ensures high resistance to rust and oxidation
• Clockwise rotation with 65mm diameter pulley and 31mm pulley width

This tensioner eliminates common belt drive problems including belt squeal, improper tracking, and accessory failure by automatically adjusting to compensate for belt stretch. The robust construction and engineered design make it suitable for both automotive and light truck applications, outperforming and outlasting competitive OE parts.