Dayco 89485 Accessory Drive Belt Tensioner Assembly

Dayco 89485 Accessory Drive Belt Tensioner Assembly

Dayco 89485 is an automatic accessory drive belt tensioner assembly for serpentine belt systems. It uses a single flat pulley with a 74 mm diameter and counter clockwise rotation to maintain proper belt tension in the accessory drive system.

Key Features

• Accessory drive belt tensioner assembly for serpentine belt applications
• Automatic tensioning design helps maintain consistent belt load
• Single pulley configuration
• Pulley 1 diameter: 74 mm
• Pulley 1 width: 39.25 mm
• Flat pulley surface: Yes
• Counter clockwise rotation

Product Details

This Dayco accessory drive belt tensioner assembly, part number 89485, is built for vehicles that use a serpentine belt routing system and an automatic tensioner. The pulley design and counter clockwise direction are important for proper belt tracking and tension control in the accessory drive system. Dayco 89485 is also cross-referenced with ACDelco 38508 for the same application.

Compatible vehicle coverage includes Saab applications listed in the catalog data, making this a relevant replacement choice when searching for a Dayco 89485 serpentine belt tensioner assembly or a Saab accessory drive belt tensioner assembly.

Common Problems This Part Can Address

• Belt slack in the accessory drive system
• Noise from a worn or weak tensioner assembly
• Uneven serpentine belt tracking
• Loss of proper belt tension on driven accessories
• Wear related to a failing tensioner pulley assembly

Installation Notes and Tips

Verify pulley diameter, rotation direction, and belt type before installation. Confirm that the serpentine belt routing matches the vehicle’s accessory drive layout and inspect the belt, idlers, and adjacent pulleys for wear at the same time. For Saab fitment searches, confirm the application against the vehicle’s original tensioner specifications before ordering.

Quality Assurance

Dayco is a recognized name in belt drive system components, and this tensioner assembly is cataloged with OE-style interchange references for application matching. Part number 89485 is listed with interchange coverage including ACDelco 38508, supporting cross-reference verification during replacement selection.