Dayco 89211 No Slack Automatic Belt Tensioner Assembly

The Dayco 89211 is a high-quality automatic belt tensioner designed to maintain constant tension on serpentine belt drive systems. Part of Dayco's renowned No Slack product line, this tensioner features the company's original patented flat spring design that provides superior performance and reliability for automotive accessory drive systems.

Key Features:

• Patented flat spring technology provides less operating range variation in tension
• Heavy-duty cast aluminum spring case and arm resists cracking and fatigue
• PTFE string wound within the spring resists abrasion and dampens noise
• Flat spring is specially coated to resist rust and corrosion
• Steel locator pin built to withstand extreme drive demands
• Thermoplastic rubber spring slot plug helps keep out harmful contaminants
• Rubber O-ring seal protects against dust and grime
• Zinc-coated mounting bolt resists rust
• Made in USA

Performance Benefits:

• Reduces risk of premature accessory bearing failure due to high tension when new belts are installed
• Lessens risk of belt noise, slippage, and poor accessory performance caused by low tension
• Maintains constant tension throughout the life of the belt, compensating for stretch and wear
• Engineered to outperform and outlast OEM parts
• Promotes quieter performance and longer service life

This automatic belt tensioner assembly is designed for professional installation and provides reliable tension control for serpentine belt systems. The deflected arm plate design dampens arm movement, prolonging tensioner life by limiting rotational movement. Ideal for repair shops and automotive professionals seeking OEM-quality replacement parts.