Dayco 89719 Accessory Drive Belt Tensioner Assembly

Overview of Dayco Accessory Drive Belt Tensioner Assembly 89719

The Dayco 89719 accessory drive belt tensioner assembly is designed for precise serpentine belt tension control in select BMW models. This automatic tensioner ensures consistent belt performance and durability, supporting optimal engine accessory operation.

• Serpentine belt type for smooth power transmission
• Counter clockwise rotation direction
• Single pulley design with 65 mm diameter
• Pulley width of 25 mm with flat surface
• Automatic tensioner type for maintenance-free operation

Technical Details and Specifications

This Dayco accessory drive belt tensioner assembly (part number 89719) features a single pulley with a 65 mm diameter and a 25 mm width, designed with a flat surface to ensure proper belt alignment and reduce wear. The tensioner operates in a counter clockwise direction, matching the belt routing requirements of compatible BMW vehicles. As an automatic tensioner, it maintains consistent tension on the serpentine belt, reducing the need for manual adjustments and helping to extend belt life.

Compatible BMW Models

This tensioner assembly is compatible with a range of BMW models, including the 228i, 228i xDrive, 320i, 320i xDrive, 328i, 328i GT xDrive, 328i xDrive, 428i, 428i Gran Coupe, 428i xDrive, 428i xDrive Gran Coupe, 528i, 528i xDrive, X1, X3, X4, and Z4. Ensure fitment by verifying your vehicle’s model and year before installation.

Common Applications and Problem Resolution

• Maintains proper serpentine belt tension to prevent slippage
• Reduces belt noise caused by improper tension
• Prevents premature belt wear and damage
• Supports smooth operation of engine accessories like alternator and power steering
• Eliminates the need for manual tension adjustments

Installation Notes and Tips

When installing the Dayco 89719 tensioner assembly, ensure the belt routing matches the counter clockwise direction of the pulley. Verify pulley alignment and belt condition before installation. Use appropriate tools to relieve tension safely and avoid damage to the tensioner or belt. It is recommended to inspect the serpentine belt and related components during installation for optimal performance.

Quality Assurance and Warranty

Dayco manufactures this accessory drive belt tensioner assembly to meet OEM specifications for durability and performance. The automatic tensioner design supports consistent belt tension over time. While specific warranty details may vary, Dayco products typically come with a limited warranty covering defects in materials and workmanship. Consult product documentation or your supplier for exact warranty terms.