Dayco 89349 Automatic Accessory Belt Tensioner Assembly

The Dayco 89349 is an automatic accessory drive belt tensioner designed as a direct OE replacement for serpentine belt drive systems. Engineered to maintain consistent belt tension across all engine operating conditions, this tensioner helps protect accessory components and extend the life of the entire drive belt system.

At the heart of this tensioner is Dayco's original patented flat spring design, which provides less operating range variation compared to conventional coil spring tensioners. This reduces the risk of premature accessory bearing failure caused by excessive tension when a new belt is installed, and minimizes the chance of belt squeal, slippage, or poor accessory performance due to insufficient tension.

Key Features:

• Patented flat spring design for consistent, stable belt tension
• Rust-resistant coating on the flat spring for long-term durability
• Heavy-duty cast aluminum spring case resists cracking and fatigue
• Heavy-duty cast aluminum arm provides additional strength and reduced distortion
• Rubber O-ring seals help keep contaminants out of internal components
• Direct OE replacement — sold individually
• Aluminum construction for lightweight strength
• Spring-type tensioner pulley

The Dayco 89349 is built to outperform and outlast OE parts, delivering quieter operation and longer service life for vehicles equipped with alternator and power steering accessory drives.