Dorman 419-218 Accessory Drive Belt Tensioner Assembly

Overview of Dorman Accessory Drive Belt Tensioner Assembly 419-218

The Dorman 419-218 accessory drive belt tensioner assembly is designed for reliable performance in Ford Contour and Mercury Mystique vehicles. This serpentine belt tensioner ensures proper belt tension and smooth operation of your vehicle's accessory drive system.

• Compatible with Ford Contour and Mercury Mystique models
• Serpentine belt type with 6 grooves for optimal belt engagement
• Composite pulley material with a 40 mm bearing diameter
• Single pulley design with one pulley bearing for durability
• Counterclockwise tensioner rotation for precise belt tensioning
• Dimensions: 17 mm inside diameter, 27.9-28 mm width, 103 mm outside diameter

Technical Details and Specifications

The Dorman 419-218 tensioner assembly features a composite pulley constructed to reduce weight while maintaining strength. The pulley includes a single bearing with a 40 mm diameter, supporting smooth rotation and long service life. The tensioner is designed for serpentine belts with six grooves, ensuring compatibility with the accessory drive systems in Ford Contour and Mercury Mystique vehicles. Its counterclockwise rotation mechanism maintains consistent belt tension, preventing slippage and premature wear. The tensioner’s dimensions—17 mm inside diameter, approximately 28 mm width, and 103 mm outside diameter—are engineered to fit precisely within the specified vehicle models.

Applications and Problem Resolution

This accessory drive belt tensioner assembly is used to maintain proper tension on the serpentine belt, which drives multiple engine accessories. It addresses common issues such as:

• Excessive belt slack causing slipping or noise
• Worn or damaged tensioner pulley bearings
• Misalignment of the accessory drive belt
• Premature belt wear due to inconsistent tension
• Vibration or squealing noises from the belt system

Installation Notes and Tips

When installing the Dorman 419-218 tensioner assembly, ensure the serpentine belt is properly routed according to the vehicle’s belt diagram. Use appropriate tools to relieve tension safely before removing the old tensioner. Verify the tensioner rotation is counterclockwise to match the original equipment. Inspect the belt for wear and replace if necessary to ensure optimal performance. Tighten mounting bolts to manufacturer specifications to avoid misalignment or damage.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 419-218 accessory drive belt tensioner assembly undergoes rigorous quality control to ensure durability and reliable operation in Ford Contour and Mercury Mystique vehicles. This part is backed by Dorman’s limited warranty, providing coverage against defects in material and workmanship under normal use.