Dorman 419-378 Accessory Drive Belt Tensioner Assembly

Reliable Accessory Drive Belt Tensioner for Ford Trucks

The Dorman 419-378 Accessory Drive Belt Tensioner Assembly is engineered to maintain optimal belt tension in Ford trucks, including the E-350 Super Duty, F-150, F-250 Super Duty, and F-350 models. Constructed with durable aluminum, this tensioner ensures consistent performance and longevity under demanding conditions.

• Constructed from high-quality aluminum for strength and corrosion resistance
• Hexagonal bolt head type for secure and easy installation
• Flanged pulley design enhances belt alignment and reduces slippage
• Compatible with Ford E-350 Super Duty, F-150, F-250 Super Duty, and F-350 models
• Part number 419-378 ensures precise fit and function

Durable Aluminum Construction and Design Features

This accessory drive belt tensioner assembly features an aluminum body and pulley, providing a lightweight yet robust component that resists wear and corrosion. The pulley has a flanged design to help maintain proper belt tracking, reducing the risk of belt misalignment or premature wear. The tensioner’s hexagonal bolt head type allows for straightforward installation using standard tools. With an outside diameter and width of 73.66 mm, it fits precisely within the accessory drive system of compatible Ford trucks.

Compatible Ford Models and Part Number Details

The Dorman 419-378 tensioner assembly is specifically designed for use with Ford E-350 Super Duty, F-150, F-250 Super Duty, and F-350 trucks. Using the correct part number ensures compatibility and reliable operation within the accessory drive belt system. This part is engineered to maintain proper belt tension, which is critical for the performance of engine-driven accessories 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 due to misalignment
• Reduces noise from loose or failing belt tension components
• Maintains consistent belt tension for optimal accessory performance
• Helps avoid engine overheating by ensuring proper operation of the water pump belt

Installation Notes and Tips

Installation requires standard hand tools compatible with hexagonal bolt heads. Ensure the belt is properly routed before tensioner installation. Rotate the tensioner clockwise or counter-clockwise as needed to relieve belt tension during replacement. Verify pulley alignment and belt tension after installation to prevent premature wear or noise.

Quality Assurance and Warranty Information

Dorman manufactures this accessory drive belt tensioner assembly to meet or exceed OEM specifications. The aluminum construction provides durability and corrosion resistance for extended service life. While specific warranty details are not provided, Dorman parts typically come with a limited warranty covering defects in material and workmanship.