Dorman 419-358 Accessory Drive Belt Tensioner Assembly

Reliable Accessory Drive Belt Tensioner for Chevrolet and GMC

The Dorman 419-358 Accessory Drive Belt Tensioner Assembly is engineered to maintain optimal belt tension in heavy-duty vehicles. Designed for select Chevrolet, GMC, and Hummer models, this tensioner ensures consistent performance and durability under demanding conditions.

• Constructed with aluminum and plastic components for strength and lightweight durability
• Hexagonal bolt head type for secure and easy installation
• Flanged pulley design with 6 grooves to accommodate multi-rib belts
• Compatible with clockwise and counter-clockwise rotation systems
• Metallic gray and black finish for corrosion resistance and long service life
• Inside diameter of 10.2 mm and length of 5 units for precise fitment

Durable Materials and Design Features

This accessory drive belt tensioner assembly combines aluminum and plastic materials to balance strength and weight. The aluminum body provides rigidity and heat resistance, while the plastic components reduce overall weight and noise. The hexagonal bolt head type allows for straightforward installation using standard tools. The pulley is flanged and features six grooves, designed to securely guide the accessory drive belt and prevent slippage. Its metallic gray and black color finish offers additional protection against wear and corrosion, extending the component's lifespan.

Compatible Vehicles and Applications

The Dorman 419-358 tensioner assembly is compatible with a range of Chevrolet, GMC, and Hummer heavy-duty models, including:

• Chevrolet Express 2500 and 3500
• GMC Savana 2500 and 3500
• GMC Sierra 2500 HD, 2500 HD Classic, 3500, 3500 Classic, and 3500 HD
• Chevrolet Silverado 2500 HD, 2500 HD Classic, 3500, 3500 Classic, and 3500 HD
• Hummer H1

Common Issues Addressed by This Tensioner

• Accessory belt slippage causing noise or reduced accessory performance
• Loss of proper belt tension leading to premature belt wear
• Vibration or misalignment in the accessory drive system
• Failure of original tensioner components due to wear or corrosion
• Inconsistent belt tension affecting alternator, power steering, or AC operation

Installation Notes and Tips

When installing the Dorman 419-358 tensioner assembly, ensure the correct orientation for clockwise or counter-clockwise rotation based on your vehicle’s configuration. Use a hex socket or wrench to tighten the hexagonal bolt securely without over-torquing. Verify that the flanged pulley aligns properly with the accessory drive belt grooves to prevent premature belt wear. It is recommended to inspect the belt condition and replace it if necessary during installation.

Quality Assurance and Warranty

Dorman manufactures this accessory drive belt tensioner assembly to meet or exceed OEM specifications for fit, form, and function. The combination of aluminum and plastic materials is selected for durability and resistance to environmental factors. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in materials and workmanship.