Dorman 419-388 Accessory Drive Belt Tensioner Assembly

Durable Accessory Drive Belt Tensioner for Ford Super Duty

The Dorman 419-388 accessory drive belt tensioner assembly is engineered to provide reliable belt tension for Ford F-250 Super Duty and F-350 Super Duty trucks. Constructed with aluminum and featuring a hexagonal bolt head, this tensioner ensures consistent performance and durability under demanding conditions.

• Material: High-quality aluminum housing for strength and corrosion resistance
• Hexagonal bolt head design for secure and easy installation
• Flanged pulley made of durable plastic to reduce wear
• Dimensions: 6.9 inches length, 78.55 mm outside diameter, 35.26 mm inside diameter
• Includes bushing for smooth operation and extended service life
• Color: Silver and black components for corrosion protection

Technical Details and Construction

The Dorman 419-388 tensioner assembly features an aluminum body that balances lightweight design with structural integrity. The pulley is constructed from plastic and includes a flange to maintain belt alignment and reduce slippage. The tensioner’s hexagonal bolt head allows for straightforward installation using standard tools. With a width of 52.67 mm and a bearing bore inside diameter of 2.6 mm, this component is designed to fit precisely within the accessory drive belt system of Ford F-250 and F-350 Super Duty models.

Compatible Vehicles and Applications

This accessory drive belt tensioner assembly is compatible with the following Ford trucks:

• Ford F-250 Super Duty
• Ford F-350 Super Duty

It is designed to maintain proper tension on the accessory drive belt, ensuring optimal operation of engine components such as the alternator, power steering pump, and air conditioning compressor.

Common Issues Addressed by This Tensioner

• Eliminates belt slippage caused by worn or weak tensioners
• Prevents premature belt wear and noise
• Reduces risk of accessory drive system failure
• Maintains consistent belt tension for improved engine performance
• Helps avoid overheating due to accessory belt malfunction

Installation Notes and Tips

When installing the Dorman 419-388 tensioner assembly, ensure the hexagonal bolt head is properly torqued to manufacturer specifications. Verify belt alignment on the flanged pulley to prevent premature wear. It is recommended to inspect the accessory drive belt for damage and replace it if necessary during installation. Proper installation will help maintain the longevity and performance of the tensioner and the entire belt system.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards, providing reliable fit and function. The 419-388 tensioner assembly undergoes rigorous quality control to ensure durability and performance. Please refer to Dorman’s warranty policy for specific coverage details.