Dayco 89597 Accessory Drive Belt Idler Pulley

Accessory Drive Belt Idler Pulley for Mercedes-Benz

Dayco 89597 is an accessory drive belt idler pulley built with a polymer body and a single bearing for serpentine belt systems. It is a direct-fit service part for a wide range of Mercedes-Benz applications, including CLA250, GLA250, GLC300, GLB250, Sprinter 2500, and Metris models.

Key Features

• Polymer pulley construction for accessory drive belt service
• Serpentine belt type application
• Single bearing design
• Bearing inner diameter: 17 mm
• Bearing width: 12 mm
• Flat pulley profile
• Maximum belt width: 6 rib
• Dayco part number 89597

Detailed Description

This Dayco accessory drive belt idler pulley is specified for Mercedes-Benz vehicles that use a serpentine accessory drive system. The polymer pulley body and single-bearing layout are matched to the belt routing requirements found on many late-model Mercedes-Benz platforms, including 2014-2023 CLA250, 2016-2023 GLC300, 2018-2023 GLA250, 2020-2024 GLB250, and 2019-2023 Sprinter 2500 applications. Dayco 89597 is also listed for select AMG and Metris coverage, making it a practical replacement when servicing the accessory drive belt system.

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

What It Helps Address

• Accessory belt noise from a worn idler pulley bearing
• Belt tracking issues caused by pulley wear
• Serpentine belt vibration in the drive system
• Visible pulley surface wear or cracking
• Maintenance replacement during belt service on Mercedes-Benz engines

Installation Notes and Tips

Verify pulley diameter, belt width, and bearing dimensions before installation. Confirm the belt path and mounting location against the vehicle’s accessory drive layout, especially on Mercedes-Benz CLA250, GLA250, GLC300, and Sprinter 2500 models. Inspect the serpentine belt, tensioner, and adjacent pulleys at the same time so the new idler pulley is installed into a clean, fully serviced drive system. Dayco 89597 should be matched to the exact engine and belt routing listed in the vehicle catalog.

Quality Assurance

Dayco is a recognized supplier in the belt drive and cooling category, and this pulley is built to the listed dimensional specifications for accurate service replacement. Part number 89597 is engineered for the confirmed Mercedes-Benz fitments shown above.