Dayco 89610 No Slack Automatic Belt Tensioner Assembly

The Dayco 89610 Automatic Belt Tensioner is a direct-replacement accessory drive belt tensioner engineered to maintain constant, consistent tension on serpentine belt drive systems. Built to OE standards and beyond, this tensioner is designed to resolve common belt drive issues including belt squeal, improper tracking, and accessory performance loss.

Patented Flat Spring Technology:

Unlike tensioners that rely on coil springs, the Dayco 89610 features Dayco's original, patented flat spring design to provide less operating range variation in tension. This innovative approach reduces the risk of premature accessory bearing failure caused by excess tension when a new belt is installed, while also minimizing the risk of belt noise, slippage, and poor accessory performance that can result from low tension as the belt stretches and wears over time.

Key Features:

• Patented flat spring design for consistent, stable belt tension throughout the belt's life
• Heavy-duty cast aluminum spring case and arm to resist cracking, fatigue, and distortion
• Steel pivot tube for enhanced stability and strength at critical torque points
• Thermoplastic rubber spring slot plugs and rubber O-ring seals to keep harmful contaminants out
• PTFE strip wound within the spring to resist abrasion and dampen noise
• Zinc-coated mounting bolts for rust resistance
• Lubricated nylon pivot tube bushing and spring bushing for quieter operation
• Genuine Dayco part — includes original packaging and hardware
• Direct OE replacement — no modifications required

The Dayco 89610 is built to outperform and outlast competitive OE parts, enduring tough underhood conditions while promoting quieter performance and extended service life for serpentine belt drive systems.