Dayco 89445 Heavy Duty Automatic Belt Tensioner Assembly

The Dayco 89445 Heavy Duty Automatic Belt Tensioner Assembly is engineered to maintain constant tension on serpentine belt drive systems in demanding applications. This professional-grade tensioner is designed for vehicles requiring heavy-duty performance and durability.

Key Features:

• Heavy-duty cast aluminum spring case and arm construction resists cracking, corrosion, and fatigue
• Patented flat spring design provides consistent tension with less operating range variation
• Reduces risk of premature accessory bearing failure caused by excessive belt tension
• Dual lifetime lubricated bearings deliver long-lasting, dependable service
• Thermoplastic rubber spring slot plugs and O-ring seals help keep contaminants out
• Zinc-coated mounting hardware resists rust and corrosion
• Direct replacement design for easier installation

Unlike tensioners with coil springs, the Dayco 89445 features an original flat spring design that prevents fluctuations to the tensioner body, reducing the risk of belt noise and housing separation. The robust construction handles higher torque and power pulses while promoting quieter performance and extended service life in even the toughest operating conditions.