Gates 39166 Accessory Drive Belt Tensioner Assembly

OE Automatic Belt Tensioner for Sprinter

The Gates DriveAlign Premium OE Automatic Belt Tensioner, part number 39166, is built for accessory drive belt systems that require consistent belt tension and OE-style fit. It is a direct replacement for select Mercedes-Benz Sprinter, Sprinter 2500, Sprinter 3500, and Sprinter 3500XD applications.

Gates applies OE system design experience to this DriveAlign Premium OE Automatic Belt Tensioner line, with manufacturing held to rigid tolerances for OE fit, form, and function. The result is a thermoplastic tensioner assembly with a smooth/backside pulley surface and OE Exact comparison rating for service replacement work.

Key Features

• Part number 39166 for accessory drive belt tensioner replacement
• OE Exact comparison rating for OE-style fit and function
• Thermoplastic tensioner body
• Single smooth/backside pulley for V-ribbed belt systems
• 2 mounting holes for direct installation on listed applications
• Pulley dimensions: 2.56 in. outside diameter, 1.02 in. width, 0.67 in. bearing bore inside diameter
• Compatible With Mercedes-Benz Sprinter, Sprinter 2500, Sprinter 3500, and Sprinter 3500XD applications listed below

Product Details

This Gates DriveAlign Premium OE Automatic Belt Tensioner is engineered for accessory drive belt system service where stable belt tension is critical to belt tracking and accessory operation. The pulley uses a smooth/backside contact surface for V-ribbed belt routing, and the assembly is manufactured to OE-level specifications for fitment on the confirmed Mercedes-Benz Sprinter platform. If you are replacing a worn belt tensioner on a Mercedes-Benz Sprinter 2500 or Mercedes-Benz Sprinter 3500, part number 39166 provides a direct-match service option.

This part cross-references Continental 49834 and Dayco 89682 for the same application.

Vehicle Fitment

• Fits 2022 Mercedes-Benz Sprinter, N/A
• Fits 2014-2016 Mercedes-Benz Sprinter, N/A
• Fits 2022 Mercedes-Benz Sprinter 2500, N/A
• Fits 2014-2016 Mercedes-Benz Sprinter 2500, N/A
• Fits 2022 Mercedes-Benz Sprinter 3500, N/A
• Fits 2014-2016 Mercedes-Benz Sprinter 3500, N/A
• Fits 2022 Mercedes-Benz Sprinter 3500XD, N/A

Common Replacement Reasons

• Accessory belt tension loss
• Belt noise from a worn tensioner pulley
• Uneven belt tracking on V-ribbed drive systems
• Visible wear in the tensioner assembly
• Service replacement on a Mercedes-Benz Sprinter belt drive system

Installation Notes and Tips

Verify belt routing and confirm the existing tensioner matches the listed pulley dimensions before installation. Inspect the accessory drive belt, idler pulleys, and related belt drive components at the same time to avoid repeat service. Confirm vehicle application by year, model, and engine-bay configuration before ordering part number 39166.

Quality Assurance

Gates is a global OE system designer, and the DriveAlign Premium OE Automatic Belt Tensioner line is manufactured to rigid tolerances and specifications to support OE fit, form, and function on the listed Mercedes-Benz Sprinter applications.