Dorman 419-113 Accessory Drive Belt Tensioner Assembly - Air Conditioning

Reliable Accessory Drive Belt Tensioner for Chevrolet and GMC Vehicles

The Dorman 419-113 accessory drive belt tensioner assembly is engineered to maintain optimal tension on serpentine belts in select Chevrolet and GMC models. Designed for durability and precise fitment, this tensioner supports smooth engine operation and accessory performance.

• Compatible with Chevrolet Astro, Express 1500/2500/3500, G10, G20, G30, Safari, and GMC Savana 1500/2500/3500
• Serpentine belt type tensioner with a single pulley
• Pulley diameter: 90.3 mm outside, 17 mm inside diameter
• Width options: 20 mm and 27 mm for versatile fitment
• Polyamide 6.6 pulley reinforced with 30% glass fiber for strength and wear resistance
• Counterclockwise rotation tensioner for proper belt alignment
• Includes one pulley bearing with a 40 mm diameter for smooth operation

Detailed Product Description and Specifications

The Dorman 419-113 accessory drive belt tensioner assembly is designed specifically for use with serpentine belt systems on various Chevrolet and GMC vans and trucks. The tensioner features a robust polyamide 6.6 pulley filled with 30% glass fiber, enhancing durability and resistance to wear under continuous engine stress. The pulley measures 90.3 mm in outside diameter and 17 mm inside diameter, with widths of 20 mm and 27 mm to accommodate different belt configurations. This assembly includes a single pulley with one bearing, sized at 40 mm in diameter, ensuring smooth rotation and consistent belt tension. The tensioner rotates counterclockwise, matching the original equipment specifications for proper belt routing and tensioning.

Applications and Common Issues Addressed

• Maintains proper serpentine belt tension to prevent slipping and premature wear
• Reduces noise caused by loose or worn belt tensioners
• Prevents accessory drive system failures such as alternator or power steering pump malfunction
• Eliminates belt misalignment issues that can cause uneven wear
• Restores reliable belt tension in Chevrolet Astro, Express, G-series vans, Safari, and GMC Savana models

Installation Notes and Tips

When installing the Dorman 419-113 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 counterclockwise rotation direction matches the original part to avoid belt misalignment. Inspect the serpentine belt for wear and replace if necessary to ensure optimal performance. Tighten mounting bolts to manufacturer torque specifications to secure the tensioner assembly.

Quality Assurance and Warranty Information

Dorman manufactures the 419-113 accessory drive belt tensioner assembly to meet or exceed OEM standards for fit, form, and function. The use of reinforced polyamide materials and precision bearings contributes to long service life. This part is backed by Dorman’s limited warranty, providing coverage against defects in material and workmanship under normal use conditions.