Dayco 89379 Accessory Drive Belt Tensioner Assembly

Overview of Dayco Accessory Drive Belt Tensioner Assembly 89379

The Dayco Accessory Drive Belt Tensioner Assembly 89379 is designed for reliable serpentine belt tensioning in select Nissan and INFINITI vehicles. Engineered for clockwise operation with a single pulley, this automatic tensioner ensures consistent belt performance and longevity.

• Compatible with Nissan Armada, NV3500, Pathfinder, Pathfinder Armada, TITAN, and INFINITI QX56
• Serpentine belt type tensioner assembly
• Automatic tensioner with clockwise direction
• Single pulley design with 102 mm diameter and 35 mm width
• Pulley features a flat surface for optimal belt contact

Technical Details and Specifications

This Dayco accessory drive belt tensioner assembly (part number 89379) features an automatic tensioning mechanism that maintains proper belt tension without manual adjustment. The tensioner operates in a clockwise direction and includes one pulley with a diameter of 102 mm and a width of 35 mm. The pulley surface is flat, which supports smooth serpentine belt engagement and reduces wear. This component is specifically engineered for use with serpentine belts, ensuring compatibility with the accessory drive systems of Nissan and INFINITI models such as the Armada, NV3500, Pathfinder, Pathfinder Armada, TITAN, and QX56.

Applications and Problem Resolution

This tensioner assembly is used to maintain the correct tension on the serpentine belt, which drives multiple engine accessories. It addresses common issues such as:

• Excessive belt slack causing slipping or noise
• Premature belt wear due to improper tension
• Accessory drive system misalignment
• Vibration or squealing noises from the belt system
• Failure of manual tensioners in compatible Nissan and INFINITI models

Installation Notes and Tips

• Ensure the serpentine belt is properly routed before installing the tensioner
• Verify the tensioner pulley rotates clockwise as specified
• Inspect the belt and pulleys for wear during installation
• Use appropriate tools to relieve tension safely when removing the old tensioner
• Confirm proper alignment of the pulley to prevent belt damage

Quality Assurance and Warranty Information

Dayco manufactures this accessory drive belt tensioner assembly to meet or exceed OEM specifications for durability and performance. The part number 89379 undergoes rigorous quality control to ensure reliable operation in Nissan and INFINITI vehicles. While specific warranty terms may vary, Dayco typically offers coverage against defects in materials and workmanship to support long-term use.