Dayco 89739 Accessory Drive Belt Tensioner Assembly

The Dayco 89739 is a high-quality accessory drive belt tensioner assembly designed to maintain constant tension on serpentine belt drives. This automatic belt tensioner is engineered to resolve common belt issues including belt squeal, improper tracking, and accessory component failures.

Key Features:

• Patented flat spring technology increases torque transmission to the belt when needed, compensating for stretch and wear while maintaining constant tension throughout belt life
• Cast aluminum housing and arms provide exceptional strength and long-lasting durability
• Steel locator pins and arm plates ensure precise OE fitment and reliable performance
• 6-rib serpentine pulley design for proper belt engagement
• Engineered to meet or exceed OEM specifications

Part of Dayco's No Slack automatic belt tensioner line, this assembly features durable construction with steel and thermoplastic components built to outperform and outlast original equipment parts. The tensioner maintains proper belt tension to prevent premature accessory bearing failure, belt noise, and slippage. Sold individually as a complete assembly ready for installation.

Cross-Reference Numbers: Gates 39420, Goodyear 49857, Litens 999628A, Hyundai/Kia 252812E300, 252812E350, 252812E355