Dorman 419-118 Accessory Drive Belt Tensioner Assembly

Reliable Accessory Drive Belt Tensioner for Chevrolet, GMC, and Isuzu

The Dorman 419-118 accessory drive belt tensioner assembly is engineered to maintain optimal tension on serpentine belts in select Chevrolet, GMC, and Isuzu vehicles. Designed for durability and precise fitment, this tensioner supports smooth engine operation and accessory performance.

• Compatible with Chevrolet S10, S10 Blazer, S15, S15 Jimmy, Sonoma, GMC S15 Jimmy, and Isuzu Trooper models
• Features a single polyamide 6.6 pulley reinforced with 30% glass fiber for strength and wear resistance
• Includes one pulley bearing with a 40 mm diameter for reliable rotation
• Counterclockwise tensioner rotation to match factory specifications
• Designed for serpentine belt systems with an outside diameter of 90.3 mm and inside diameter of 17 mm
• Width options of 20 mm and 27 mm accommodate specific belt configurations

Technical Details and Construction

The Dorman 419-118 tensioner assembly is built with a polyamide 6.6 pulley reinforced with 30% glass fiber fill, providing enhanced durability and resistance to heat and wear. The pulley has an outside diameter of 90.3 mm and an inside diameter of 17 mm, ensuring precise belt alignment. This assembly includes one pulley bearing measuring 40 mm in diameter, designed to support smooth and consistent rotation. The tensioner rotates counterclockwise, matching the original equipment specifications for the Chevrolet S10, S10 Blazer, S15, S15 Jimmy, Sonoma, and Isuzu Trooper models it supports.

Applications and Problem Resolution

This accessory drive belt tensioner assembly is intended for use in serpentine belt systems on compatible Chevrolet, GMC, and Isuzu vehicles. It helps address common issues such as:

• Excessive belt slack causing slipping or noise
• Worn or damaged tensioner pulley bearings leading to rough operation
• Misalignment of the serpentine belt affecting accessory performance
• Loss of proper belt tension resulting in accessory drive failure
• Premature belt wear due to inconsistent tension

Installation Notes and Tips

When installing the Dorman 419-118 tensioner assembly, ensure the serpentine belt is properly routed according to the vehicle’s service manual. Verify the tensioner rotation is counterclockwise to match factory design. Inspect the belt for wear and replace if necessary to maintain system integrity. Use appropriate tools to avoid damage to the pulley or bearing during installation. Confirm belt tension after installation to prevent slippage or noise.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 419-118 accessory drive belt tensioner assembly undergoes rigorous quality control to ensure durability and reliable performance. This part is backed by Dorman’s limited warranty, providing coverage against defects in material and workmanship under normal use.