Dayco 89318 Accessory Drive Belt Tensioner Assembly

Overview of Dayco Accessory Drive Belt Tensioner Assembly 89318

The Dayco 89318 accessory drive belt tensioner assembly is designed for reliable serpentine belt tensioning in select Ford, Mazda, and Mercury vehicles. This automatic tensioner ensures consistent belt tension for optimal engine accessory performance in models like the Ford Escape, Mazda Tribute, and Mercury Cougar.

• Serpentine belt type compatible
• Automatic tensioner design for consistent belt tension
• Counter clockwise direction operation
• Single pulley with 70 mm diameter and 28.3 mm width
• Pulley features 6 grooves and a non-flat surface

Technical Details and Specifications

The Dayco 89318 tensioner assembly features a single pulley with a diameter of 70 mm and a width of 28.3 mm, designed to accommodate serpentine belts with six grooves. The pulley surface is non-flat, which helps maintain proper belt alignment and grip. This tensioner operates in a counter clockwise direction and uses an automatic mechanism to maintain optimal belt tension without manual adjustment. These specifications make it suitable for accessory drive belt systems in various Ford, Mazda, and Mercury vehicles, including the Ford Focus, Contour, and Mystique.

Compatible Vehicles and Applications

This accessory drive belt tensioner assembly is compatible with the following makes and models:

• Ford Contour
• Ford Escape
• Ford Focus
• Mazda Tribute
• Mercury Cougar
• Mercury Mystique

It is specifically designed to replace worn or faulty tensioners in these vehicles, ensuring proper serpentine belt operation and accessory function.

Common Issues Addressed by Part Number 89318

• Excessive belt slack causing slipping or noise
• Worn pulley leading to belt misalignment
• Loss of automatic tensioner function resulting in belt wear
• Vibration or squealing noises from the accessory drive system
• Reduced performance of engine accessories due to improper belt tension

Installation Notes and Tips

When installing the Dayco 89318 tensioner assembly, ensure the serpentine belt is properly routed according to the vehicle’s belt diagram. The automatic tensioner requires no manual adjustment but verify the pulley rotates smoothly in the counter clockwise direction. Inspect the belt for wear and replace if necessary to maintain system reliability. Use appropriate tools to relieve tension safely during removal and installation.

Quality Assurance and Warranty

Dayco manufactures the 89318 tensioner assembly to meet OEM specifications for durability and performance. This part undergoes rigorous quality control to ensure reliable operation in the specified Ford, Mazda, and Mercury models. Warranty coverage details should be confirmed at the point of purchase, typically including protection against defects in materials and workmanship.