Dayco 89688 Automatic Serpentine Belt Tensioner Assembly

The Dayco 89688 No Slack automatic belt tensioner is engineered to maintain constant tension on serpentine belt drives, eliminating belt squeal, improper tracking, and accessory failure. This premium tensioner assembly 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 compared to conventional tensioners
• Heavy-duty cast aluminum spring case and arm resist cracking, fatigue, and distortion
• Steel locator pins and arm plates for enhanced durability and stability
• PTFE string wound within the spring resists abrasion and dampens noise
• Smooth pulley design for optimal belt contact
• Corrosion-resistant coated spring and zinc-plated mounting hardware
• Thermoplastic rubber spring slot plugs and O-ring seals keep contaminants out

Built to outperform and outlast OEM parts, the Dayco 89688 tensioner reduces the risk of premature accessory bearing failure due to excessive tension with new belts, while preventing belt noise and slippage caused by low tension as belts age. This tensioner is sold individually and meets or exceeds original equipment specifications.

OEM Cross-Reference Numbers: Toyota 16620-0T010, 16620-37010, 16620-37011, 16620-37030 | Gates 39396 | Bando 780019, 780091 | Litens 999915A