Dayco 89947 Accessory Drive Belt Tensioner Assembly - Main Drive

Accessory Drive Belt Tensioner Assembly for Serpentine Systems

Dayco 89947 is an automatic accessory drive belt tensioner assembly for serpentine belt systems. It is built with a clockwise operating direction and a 3-pulley layout to maintain proper belt tension and routing in the accessory drive system.

Replaces 89498 and 89498A, making Dayco 89947 a direct-reference option for service work on select vehicle applications, including Honda Civic and Acura Integra fitments where this tensioner assembly is specified.

Key Features

• Accessory drive belt tensioner assembly for serpentine belt systems
• Automatic tensioning design for consistent belt load control
• Clockwise direction
• 3-pulley configuration
• Pulley 1: 74 mm diameter, 40.5 mm width, flat surface
• Pulley 2: 74 mm diameter, 32.9 mm width, flat surface
• Dayco 89947 replaces 89498 and 89498A

Product Details

This Dayco accessory drive belt tensioner assembly is engineered for serpentine belt routing in the accessory drive belt system. The automatic design helps maintain belt tension as engine speed and accessory load change, while the clockwise rotation and dual flat pulleys support proper alignment in the belt path. For buyers searching for a Dayco 89947 tensioner assembly, this part number is tied to replacement applications that include Honda Civic and Acura Integra service needs.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Issues This Part Can Address

• Loose or inconsistent serpentine belt tension
• Belt squeal caused by worn tensioner components
• Improper belt tracking in the accessory drive system
• Noise from a failing automatic tensioner assembly
• Reduced accessory drive belt stability under changing engine load

Installation Notes and Tips

Verify belt routing, pulley alignment, and rotation direction before installation. Inspect the serpentine belt, idler pulleys, and related accessory drive components for wear at the same time, since a worn belt or damaged pulley can shorten the service life of the new tensioner. Confirm the replacement matches the original part number and application details for your vehicle before installation.

Quality Assurance

Dayco is a recognized name in accessory drive belt system components, and this tensioner assembly is built to replace the specified OE-style references 89498 and 89498A. Use the confirmed vehicle application data for Honda Civic and Acura Integra fitments when selecting the correct Dayco 89947 part.