Dayco 89374 No Slack Automatic Belt Tensioner Assembly

The Dayco 89374 No Slack Automatic Belt Tensioner Assembly is engineered to maintain constant tension on serpentine belt drives, ensuring optimal performance of your vehicle's engine accessories. This professional-grade tensioner eliminates common belt problems including squealing, improper tracking, and accessory failure.

Advanced Flat Spring Technology:

Featuring Dayco's proprietary flat spring design, this tensioner automatically compensates for belt stretch and wear throughout the belt's service life. The innovative flat spring technology provides consistent tension with minimal operating range variations, reducing the risk of premature accessory bearing failure from excessive tension and preventing belt noise or slippage from insufficient tension.

Premium Construction Features:

• Heavy-duty cast aluminum housing and arm resists cracking and fatigue
• Steel locator pins and arm plates for precise positioning
• PTFE strip wound within spring resists abrasion
• Rust-resistant coating on flat spring mechanism
• 70mm smooth pulley with 31mm width
• Clockwise rotation direction

OEM Cross-References:

Replaces Toyota 16620-31021, 16620-31040, ACDelco 38410/39140, Gates 38410/39140, CARQUEST 38410/39140, NAPA 38410/39140, Duralast 305374, and Goodyear 49424.

Engineered to outperform and outlast OEM parts, this Dayco tensioner delivers quieter operation and extended service life for serpentine belt systems powering alternators, air conditioning compressors, power steering pumps, water pumps, and other critical engine accessories.