Dayco 84023 No Slack Automatic Serpentine Belt Tensioner

The Dayco 84023 No Slack Automatic Belt Tensioner is a direct-fit, spring-loaded tensioner engineered to maintain constant tension on serpentine belt drives. Sold individually, this tensioner is designed to resolve common belt drive issues including belt squeal, improper tracking, and accessory slippage.

Key Features:

• Patented flat spring design provides less operating range variation in tension compared to conventional coil spring tensioners, reducing the risk of premature accessory bearing failure from over-tension on new belt installation
• Heavy-duty cast aluminum spring case resists cracking and fatigue under continuous engine stress
• Heavy-duty cast aluminum arm offers additional structural strength and minimizes distortion
• PTFE (Teflon) strip wound within the spring resists abrasion and extends service life
• Rust-resistant coated flat spring for long-term durability
• Steel locator pin (where application demands) ensures precise installation alignment
• Steel pivot tube (where application demands) provides additional strength for critical torque requirements
• Thermoplastic rubber spring slot plug keeps out harmful contaminants
• Lubricated nylon pivot tube bushing and spring bushing promote quieter operation
• Rubber O-ring seal protects against dust and grime intrusion
• Zinc-coated mounting bolt resists rust and provides concentric seating for consistent tension
• Aluminum retainer ring locks the spring case and arm together and seals against corrosion

The No Slack tensioner automatically compensates for belt stretch and wear over time, maintaining proper drive belt tension throughout the belt's service life. This helps prevent belt noise, slippage, and degraded accessory performance — keeping the alternator, power steering pump, A/C compressor, and water pump operating at peak efficiency. Sold as one (1) tensioner assembly.