Dayco 89257 Accessory Drive Belt Tensioner Assembly

Dayco 89257 Accessory Drive Belt Tensioner

The Dayco 89257 is an automatic serpentine accessory drive belt tensioner assembly built for Ford truck and van applications that use a clockwise belt routing. It features a two-pulley design with one grooved pulley and one flat pulley to maintain proper belt tracking and tension across the accessory drive system.

Key Features

• Automatic accessory drive belt tensioner assembly for serpentine belt systems
• Clockwise rotation direction
• Two-pulley design for belt routing support
• Pulley 1: 76 mm diameter, 8 grooves, 38.1 mm width
• Pulley 2: 76 mm diameter, flat face, 37 mm width
• Direct-fit application for select Ford E-Series, F-Series Super Duty, and Excursion models
• Cross-references Dayco 89257 for the same application

Detailed Description

Dayco 89257 is an automatic serpentine belt tensioner assembly engineered for accessory drive belt systems that require consistent belt tension and stable pulley alignment. The dual-pulley layout includes one 8-groove pulley and one flat pulley, both measuring 76 mm in diameter, to support the belt path used on select Ford applications. This part number is listed for 1998-2003 Ford E-350 Econoline, E-350 Econoline Club Wagon, E-350 Club Wagon, E-350 Super Duty, F-250 Super Duty, F-350 Super Duty, and Excursion models. It is also a direct replacement reference for common aftermarket and OE cross numbers, including Ford F8TE-6B209-BD and Gates 38191.

For buyers searching for a Ford E-350 Super Duty serpentine belt tensioner, Ford F-250 Super Duty accessory drive belt tensioner, or a Dayco 89257 replacement tensioner assembly, this part is matched to the listed vehicle applications and pulley specifications.

What It Helps Address

• Loose or inconsistent serpentine belt tension
• Belt squeal caused by worn tensioner components
• Belt tracking issues across accessory drive pulleys
• Reduced belt control in high-load accessory drive systems
• Replacement needs for worn Ford E-Series, F-Series Super Duty, and Excursion tensioners

Installation Notes and Tips

Verify belt routing, pulley alignment, and clockwise rotation before installation. Compare the pulley diameter, groove count, and flat-pulley configuration against the original unit to confirm match-up. This part fits 1998 Ford E-350 Econoline, 1998-2002 Ford E-350 Econoline Club Wagon, 1999-2003 Ford E-350 Super Duty, 1999-2003 Ford F-250 Super Duty, 1999-2003 Ford F-350 Super Duty, 2000-2003 Ford Excursion, and 2003 Ford E-350 Club Wagon. For a Ford E-350 Super Duty or Ford Excursion belt service, confirm the accessory drive system uses the same serpentine layout before replacement.

Quality Assurance

Dayco manufactures accessory drive components for service replacement applications, and this tensioner assembly is specified with the pulley dimensions and rotation direction needed for the listed Ford fitments. Part number 89257 is cataloged against multiple OE and aftermarket references to support application matching.