Dayco 89425 Heavy Duty Automatic Belt Tensioner Assembly

The Dayco 89425 Automatic Belt Tensioner is engineered for heavy-duty vehicle applications, delivering superior performance and durability in demanding serpentine belt drive systems. This tensioner features Dayco's patented flat spring design that maintains constant, even tension throughout the belt's service life, reducing operating range variations compared to conventional coil spring tensioners.

Key Features:

• Heavy-duty cast aluminum construction resists cracking, fatigue, and rust for extended service life
• Flat spring design reduces risk of premature accessory bearing failure from over-tensioning
• PTFE-coated spring dampens noise and resists abrasion
• Single flat pulley with 26mm width and 76mm diameter
• Minimizes belt noise, slippage, and poor accessory performance caused by improper tension
• Lubricated bearings for quiet, reliable operation
• Made in USA

Designed specifically for heavy-duty diesel engine accessory drive applications, this tensioner provides the consistent tension control needed to maximize belt life while protecting expensive accessory components. The robust aluminum body and arm construction offers superior strength and resistance to distortion under high-torque conditions.