Dorman 419-104 Accessory Drive Belt Tensioner Assembly

Reliable Accessory Drive Belt Tensioner for GM Vehicles

The Dorman 419-104 accessory drive belt tensioner assembly is engineered to maintain optimal serpentine belt tension for a range of General Motors vehicles. Designed for durability and precise fitment, this tensioner supports smooth operation of the accessory drive system in Buick, Chevrolet, Oldsmobile, Pontiac, and Saturn models.

• Compatible with Buick Alero, Chevrolet Equinox, Malibu, Montana, Pontiac G6, Grand Am, and more
• Serpentine belt type with 6 grooves for secure belt engagement
• Single pulley design with a 40 mm diameter bearing for reliable rotation
• Polyamide 6.6 pulley material reinforced with 30% glass fiber for strength and wear resistance
• Counterclockwise tensioner rotation to match factory specifications
• Includes belt tensioner assembly and one washer for installation
• Precise dimensions: 82.5 mm outside diameter, 17 mm inside diameter, and pulley widths of 20 mm and 28.5 mm

Detailed Product Description and Specifications

The Dorman 419-104 accessory drive belt tensioner assembly is designed to replace worn or faulty tensioners in select GM vehicles, ensuring proper tension on the serpentine belt. The tensioner features a single pulley with six grooves, matching the belt profile for consistent grip and reduced slippage. The pulley is constructed from polyamide 6.6 reinforced with 30% glass fiber, providing enhanced durability and resistance to heat and wear. The pulley bearing diameter measures 40 mm, supporting smooth rotation and reducing noise. This tensioner rotates counterclockwise, aligning with the original equipment manufacturer’s design for seamless integration.

Compatible Vehicles and Applications

This tensioner assembly is compatible with a variety of GM makes and models, including Buick Alero, Chevrolet Equinox, Malibu, Montana, Relay, Pontiac G6, Grand Am, and Saturn Vue, among others. It is specifically designed for vehicles equipped with serpentine belt accessory drive systems requiring a tensioner with these exact dimensions and rotation direction.

• Maintains proper serpentine belt tension to prevent slipping and premature wear
• Eliminates belt noise caused by improper tension
• Prevents accessory drive component failures due to belt misalignment
• Addresses issues such as squealing belts, belt mis-tracking, and loss of power steering or charging system function

Installation Notes and Tips

When installing the Dorman 419-104 tensioner, ensure the serpentine belt is properly routed according to the vehicle’s belt diagram. Use the included washer during assembly to secure the tensioner in place. Verify the tensioner rotates counterclockwise and that the pulley grooves align with the belt ribs. It is recommended to inspect the serpentine belt for wear and replace it if necessary during installation to ensure optimal system performance.

Quality Assurance and Warranty

Dorman manufactures this accessory drive belt tensioner assembly to meet or exceed OEM standards for fit, form, and function. The use of reinforced polyamide material and precision bearings contributes to long service life. This product is backed by Dorman’s limited warranty, providing coverage against defects in materials and workmanship under normal use.