Gates 38390 Accessory Drive Belt Tensioner Assembly

OE Automatic Belt Tensioner for Mercedes-Benz AMG

The Gates DriveAlign Premium OE Automatic Belt Tensioner is built for accessory drive belt systems that demand precise belt control and consistent pulley alignment. This OE Exact replacement is engineered to match original fit, form, and function for select Mercedes-Benz AMG applications, including C63 AMG, E63 AMG, CLS63 AMG, ML63 AMG, and SLS AMG models.

• Gates DriveAlign Premium OE Automatic Belt Tensioner line for OE-style replacement performance
• OE Exact comparison rating for direct-fit replacement confidence
• Thermoplastic housing material for durable belt system operation
• Single smooth/backside pulley with no flange
• V-ribbed belt type application
• Two mounting holes for OE-style installation points
• Pulley dimensions: 2.99 in. outside diameter, 1.02 in. width, 17 mm bearing bore inside diameter
• Contents: tensioner assembly

DriveAlign Premium OE Design

Gates developed the DriveAlign Premium OE Automatic Belt Tensioner using original equipment system design knowledge to deliver the fit and operating characteristics expected in factory belt drive layouts. Manufactured to rigid tolerances and specifications, this Gates 38390 tensioner is intended for accessory drive belt systems where stable belt tension and accurate pulley tracking are critical. If you are replacing a worn Mercedes-Benz AMG belt tensioner, the 38390 offers an OE-style solution for maintaining proper belt routing and tension control.

This part cross-references Continental 49814 for the same application.

Vehicle Fitment

• Fits 2012-2015 Mercedes-Benz C63 AMG, N/A
• Fits 2008-2010 Mercedes-Benz C63 AMG, N/A
• Fits 2011-2015 Mercedes-Benz SLS AMG, N/A
• Fits 2011-2012 Mercedes-Benz SL63 AMG, N/A
• Fits 2009 Mercedes-Benz SL63 AMG, N/A
• Fits 2007-2011 Mercedes-Benz CLS63 AMG, N/A
• Fits 2007-2011 Mercedes-Benz E63 AMG, N/A
• Fits 2007-2011 Mercedes-Benz ML63 AMG, N/A
• Fits 2008-2010 Mercedes-Benz CL63 AMG, N/A
• Fits 2008-2010 Mercedes-Benz S63 AMG, N/A
• Fits 2007-2009 Mercedes-Benz CLK63 AMG, N/A
• Fits 2007 Mercedes-Benz R63 AMG, N/A

Common Issues This Part Can Address

• Accessory belt slack caused by a worn tensioner assembly
• Belt noise from inconsistent pulley pressure or alignment
• Visible tensioner wear affecting belt tracking on AMG drive systems
• Reduced belt stability in high-load Mercedes-Benz AMG accessory drive applications
• Replacement needs after pulley or internal tensioner wear

Installation Notes and Quality Assurance

Verify belt routing, mounting points, and pulley alignment before installation. Inspect the accessory drive belt, idlers, and related components for wear at the same time to help ensure proper system operation after replacement. Gates backs this DriveAlign Premium OE Automatic Belt Tensioner with OE-focused engineering and manufacturing standards designed to meet original equipment fit and function expectations.