Dorman 419-112 Accessory Drive Belt Tensioner Assembly - Accessory Drive or Water Pump

Reliable Accessory Drive Belt Tensioner for GM and More

The Dorman 419-112 accessory drive belt tensioner assembly is engineered to maintain optimal serpentine belt tension for a range of vehicles including Buick, Chevrolet, GMC, and Cadillac models. Designed for durability and precise fitment, this tensioner supports smooth engine operation and accessory performance.

• Compatible with multiple GM and related makes such as Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, and Saab
• Designed for serpentine belt systems with a single pulley and six grooves
• Features a pulley made from polyamide 6.6 reinforced with 30% glass fiber for strength and wear resistance
• Includes one pulley bearing with a 40 mm diameter for smooth rotation
• Clockwise (CW) tensioner rotation to match factory specifications
• Dimensions: 82.5 mm outside diameter, 17 mm inside diameter, with widths of 20 mm and 28.5 mm for precise fit

Detailed Product Description

The Dorman 419-112 accessory drive belt tensioner assembly is designed to maintain proper tension on the serpentine belt, ensuring reliable power delivery to engine accessories such as the alternator, power steering pump, and air conditioning compressor. The tensioner features a robust polyamide 6.6 pulley reinforced with 30% glass fiber, providing enhanced durability and resistance to wear. Its single pulley design with six grooves accommodates serpentine belts commonly found on vehicles like the Chevrolet Silverado 1500, GMC Sierra 2500 HD, Cadillac Escalade, and Buick Enclave. The pulley bearing diameter of 40 mm supports smooth rotation, reducing noise and vibration. This tensioner rotates clockwise, matching the original equipment specifications for proper belt alignment and tension.

Compatible Vehicles and Applications

This accessory drive belt tensioner assembly is compatible with a wide range of vehicles, including but not limited to:

• Buick models such as Enclave and Rainier
• Cadillac Escalade, Escalade ESV, and Escalade EXT
• Chevrolet Avalanche, Silverado 1500, Suburban 1500, and Trailblazer
• GMC Canyon, Sierra 1500, Sierra 2500 HD, and Yukon XL 1500
• Hummer H2, H3, and H3T
• Isuzu Ascender and Saab 9-7x

Common Issues Addressed by This Tensioner

• Eliminates belt slippage caused by worn or weak tensioners
• Prevents squealing noises from improper belt tension
• Reduces premature serpentine belt wear and damage
• Maintains consistent accessory drive performance
• Helps avoid engine overheating due to accessory failure

Installation Notes and Tips

When installing the Dorman 419-112 tensioner, ensure the serpentine belt is properly routed according to the vehicle’s belt diagram. Use appropriate tools to relieve tension safely and avoid damage to the tensioner or belt. Verify the clockwise rotation direction matches the original tensioner. Inspect the belt for wear and replace if necessary to ensure optimal 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 pulley material and bearing specifications are selected for durability and long service life. While specific warranty details are not provided here, Dorman products typically come with a limited warranty covering defects in materials and workmanship.