Dorman 419-386 Accessory Drive Belt Tensioner Assembly

Reliable Accessory Drive Belt Tensioner for Audi and Volkswagen

The Dorman 419-386 accessory drive belt tensioner assembly is engineered to maintain optimal serpentine belt tension for select Audi and Volkswagen models. Designed with durable aluminum and steel components, this tensioner ensures consistent performance and longevity in your vehicle's accessory drive system.

• Constructed from lightweight aluminum with a steel pulley for durability
• Compatible with serpentine belt systems on Audi A4, A4 Quattro, A6, A6 Quattro, Allroad Quattro, Cabriolet, Passat, RS4, and S4 models
• Features a single pulley with a 40 mm bearing diameter for smooth operation
• Maximum adjustment range of 45 mm to accommodate belt tension variations
• Clockwise rotation tensioner designed for precise belt alignment
• Includes one mounting hole with a 13 mm diameter for secure installation

Detailed Product Description and Specifications

The Dorman 419-386 accessory drive belt tensioner assembly is crafted from aluminum, providing a balance of strength and weight savings. The tensioner features a black and silver finish, complementing the engine bay aesthetics while resisting corrosion. Its pulley is made of steel and contains a single bearing with a 40 mm diameter, ensuring smooth and reliable belt movement. The tensioner measures 155 mm in length, with an outside diameter of 76 mm and an inside diameter of 17 mm, designed specifically for serpentine belt systems. This assembly includes one mounting hole with a 13 mm diameter, facilitating straightforward installation on compatible Audi and Volkswagen vehicles.

Compatible Vehicles and Applications

This accessory drive belt tensioner assembly is compatible with a range of Audi and Volkswagen models, including the Audi A4, A4 Quattro, A6, A6 Quattro, Allroad Quattro, Cabriolet, RS4, S4, and the Volkswagen Passat. It is designed to maintain proper tension on serpentine belts, which drive essential engine 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 loose tensioners
• Prevents premature serpentine belt wear and damage
• Reduces noise from squealing or chirping belts
• Maintains consistent accessory drive performance
• Helps avoid engine overheating due to accessory failure

Installation Notes and Tips

When installing the Dorman 419-386 tensioner, ensure the serpentine belt is properly routed according to the vehicle’s service manual. Use appropriate tools to relieve tension from the old belt tensioner before removal. Verify the mounting hole alignment and torque specifications to secure the new tensioner assembly. The clockwise rotation design requires attention to correct orientation during installation to maintain proper belt tension and alignment.

Quality Assurance and Warranty

Dorman manufactures this accessory drive belt tensioner assembly to meet or exceed OEM specifications, using high-quality materials such as aluminum and steel for durability. The product undergoes rigorous testing to ensure reliable performance in demanding automotive environments. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship for this part number 419-386.