Dayco 89356 Automatic Belt Tensioner Assembly

The Dayco 89356 No Slack Automatic Belt Tensioner is engineered to maintain constant tension on serpentine belt drives, resolving common issues like belt squeal, improper tracking, and accessory failure. This accessory drive belt tensioner assembly features Dayco's original patented flat spring technology that provides less operating range variation compared to conventional designs, ensuring consistent performance throughout the belt's service life.

Key Features:

• Patented flat spring design increases torque transmission when needed, compensating for belt stretch and wear
• Heavy-duty cast aluminum spring case and arm resist cracking, fatigue, and distortion
• PTFE string wound within the spring resists abrasion and dampens noise for quieter operation
• Steel locator pins and arm plates provide enhanced stability and durability
• Premium thermoplastic rubber spring slot plugs and rubber O-ring seals keep contaminants out
• Zinc-coated mounting bolts resist rust and corrosion
• Hydraulic damper assembly reduces vibration and extends component life

This tensioner assembly reduces the risk of premature accessory bearing failure caused by high tension while preventing belt noise, slippage, and poor performance from low tension. Engineered to meet or exceed OEM specifications, the Dayco 89356 delivers reliable performance and longevity for automotive serpentine belt systems.