Dayco 89257 Accessory Drive Belt Tensioner Assembly

Overview of Dayco Accessory Drive Belt Tensioner Assembly 89257

The Dayco 89257 accessory drive belt tensioner assembly is designed for reliable serpentine belt tensioning in select Ford vehicles. Engineered for clockwise rotation and featuring dual pulleys, this automatic tensioner supports optimal belt performance in Ford E-350 and Super Duty models.

• Serpentine belt type compatible
• Automatic tensioner with clockwise direction
• Two pulleys: Pulley 1 (76mm diameter, 38.1mm width, 8 grooves), Pulley 2 (76mm diameter, 37mm width, flat)
• Compatible with Ford E-350 Club Wagon, Econoline, Super Duty, Excursion, F-250 and F-350 Super Duty
• Part number 89257 for precise fitment

Technical Details and Specifications

This Dayco accessory drive belt tensioner assembly (part number 89257) features an automatic tensioning mechanism designed to maintain proper serpentine belt tension. The assembly includes two pulleys of equal diameter (76mm), with Pulley 1 having 8 grooves and a width of 38.1mm, while Pulley 2 is flat with a width of 37mm. The tensioner operates in a clockwise direction, ensuring consistent belt alignment and reducing wear. These specifications make it suitable for heavy-duty applications in Ford E-350 Club Wagon, Econoline, Super Duty variants, Excursion, and F-250/F-350 Super Duty trucks.

Compatible Ford Models and Applications

This tensioner assembly is compatible with the following Ford vehicles:

• Ford E-350 Club Wagon
• Ford E-350 Econoline and Econoline Club Wagon
• Ford E-350 Super Duty
• Ford Excursion
• Ford F-250 Super Duty
• Ford F-350 Super Duty

Using the correct tensioner assembly like Dayco 89257 ensures proper serpentine belt operation and accessory drive system reliability in these models.

Common Issues Addressed by This Tensioner Assembly

• Eliminates belt slippage caused by improper tension
• Prevents premature belt wear and damage
• Reduces noise from loose or misaligned belts
• Maintains consistent accessory drive performance
• Helps avoid engine overheating due to belt failure

Installation Notes and Tips

When installing the Dayco 89257 tensioner assembly, ensure the serpentine belt is routed correctly according to the vehicle’s belt diagram. The automatic tensioner should rotate clockwise to apply proper tension. Inspect pulleys for wear and alignment before installation. Use appropriate tools to avoid damaging the tensioner or belt. It is recommended to replace the belt simultaneously to ensure optimal system performance.

Quality Assurance and Warranty

Dayco manufactures this accessory drive belt tensioner assembly to meet or exceed OEM specifications for durability and performance. The part number 89257 undergoes rigorous quality control to ensure reliable operation in demanding Ford E-350 and Super Duty applications. Warranty coverage details are provided by Dayco and typically include protection against defects in materials and workmanship under normal use.