Dayco 89727 Automatic Belt Tensioner Assembly

The Dayco 89727 is a premium automatic belt tensioner assembly designed to maintain constant tension on serpentine belt drive systems. This complete tensioner assembly features Dayco's patented flat spring design that provides consistent tension throughout the belt's service life, reducing operating range variations compared to conventional coil spring tensioners.

Key Features:

• Heavy-duty cast aluminum spring case and arm resists cracking, fatigue, and distortion under extreme conditions
• Patented flat wire spring with special coating provides concentric internal tension for even, constant belt tension
• PTFE strip wound within spring resists abrasion and dampens noise while the spring coating resists rust
• Thermoplastic rubber spring slot plugs and rubber O-ring seals help keep contaminants out
• Zinc-coated mounting bolts resist corrosion
• Metallic locator pin ensures proper tensioner positioning during installation

Performance Benefits:

• Reduces risk of premature accessory bearing failure from high tension when new belts are installed
• Minimizes belt noise, slippage, and poor accessory performance caused by low tension as belts wear
• Promotes quieter operation and longer service life compared to OE parts
• Built to withstand extreme drive demands and the toughest operating conditions

This No Slack automatic belt tensioner assembly is engineered for vehicles equipped with serpentine belt drive systems and represents a direct replacement for original equipment. Dayco's proven design ensures reliable performance and extended component life.