Dayco 89716 No Slack Automatic Serpentine Belt Tensioner Assembly

The Dayco 89716 No Slack Automatic Belt Tensioner is a direct-fit serpentine belt tensioner designed for automotive and light truck applications. It maintains consistent belt tension across all engine operating conditions, helping to protect accessory components and extend belt life.

At the core of this tensioner is Dayco's original patented flat spring design, which delivers tighter operating range variation than conventional coil spring tensioners. This means proper tension is maintained whether a fresh belt is installed or as the belt stretches with age — reducing the risk of belt noise, slippage, and premature accessory bearing wear.

Key Features:

• Patented flat spring design for reduced tension variation and consistent serpentine belt performance
• PTFE-wound spring strip resists internal abrasion and dampens operating noise
• Rust-resistant coated flat spring for long-term durability in harsh underhood environments
• Heavy-duty cast aluminum spring case and arm resist cracking, fatigue, and distortion
• Rubber O-ring seals and thermoplastic rubber spring slot plugs keep contaminants out of internal components
• Steel pivot tube (on applicable designs) provides added stability during operation
• Zinc-coated mounting bolts included to resist corrosion
• Engineered to meet or exceed OEM specifications for proper fit and function

The Dayco 89716 is built to endure demanding underhood conditions while promoting quieter operation and a longer service life for the entire accessory drive system. It is a reliable replacement tensioner for automotive and light truck serpentine belt drive systems.