Gates 39194 Accessory Drive Belt Tensioner Assembly

OE Automatic Belt Tensioner for Mercedes-Benz

Gates DriveAlign Premium OE Automatic Belt Tensioner 39194 is built for accessory drive systems that need consistent belt control and OE-style fit. It is a direct replacement for a wide range of Mercedes-Benz applications, including SL550, E550, S550, and G63 AMG models.

As part of the Gates DriveAlign Premium OE Automatic Belt Tensioner line, this assembly reflects Gates’ OE system design background and focus on rigid manufacturing tolerances. The result is a tensioner built around OE fit, form, and function for Mercedes-Benz accessory drive belt service.

Key Features

• Part number 39194 automatic belt tensioner assembly
• OE Exact comparison rating for direct-fit replacement use
• Thermoplastic construction
• 1 smooth/backside pulley with no flange
• V-ribbed belt type application
• 2 mounting holes for OE-style installation points
• Pulley dimensions: 2.56 in. outside diameter, 1.14 in. width, 0.67 in. bearing bore inside diameter
• Designed for Mercedes-Benz accessory drive belt systems

Detailed Description

Gates 39194 is an accessory drive belt tensioner assembly engineered for OE-style replacement on Mercedes-Benz vehicles. It uses a smooth/backside pulley and thermoplastic material construction, with dimensions that match the listed OE comparison rating for accurate belt tracking and tension control. This part is a strong match for drivers searching for a Mercedes-Benz belt tensioner replacement, automatic serpentine belt tensioner, or Gates DriveAlign 39194 for models such as the SL550, E550, S550, and GLE63 AMG.

This part cross-references Continental 49839 for the same application.

What It Helps Address

• Serpentine belt slack or inconsistent belt tension
• Belt noise caused by worn tensioner components
• Accessory drive belt tracking issues
• Reduced belt control from a fatigued automatic tensioner
• Service replacement for OE-style Mercedes-Benz belt drive maintenance

Installation Notes and Tips

Verify belt routing, pulley alignment, and mounting-hole location before installation. Confirm the replacement matches the vehicle’s accessory drive belt system and compare the old tensioner to the listed dimensions: 65 mm outside diameter, 29 mm width, and 17 mm bearing bore inside diameter. For best results, inspect the belt and related pulleys at the same time so the new tensioner is not installed against worn components.

Compatible With 2011-2020 Mercedes-Benz applications listed in the fitment data, including SL550, SL63 AMG, S550, E550, G63 AMG, GLE63 AMG, GLS550, and GL550. Gates part number 39194 is also listed for multiple Mercedes-Benz V-ribbed belt systems across these model years.

Quality Assurance

Gates manufactures this DriveAlign Premium OE Automatic Belt Tensioner to rigid tolerances and specifications to support OE fit, form, and function. The brand’s OE system design experience is reflected in the construction and application matching of this Mercedes-Benz tensioner assembly.

• Fits 2013-2020 Mercedes-Benz SL550, N/A
• Fits 2016-2019 Mercedes-Benz GLE63 AMG, N/A
• Fits 2016-2019 Mercedes-Benz GLE63 AMG S, N/A
• Fits 2017-2019 Mercedes-Benz GLS550, N/A
• Fits 2017-2019 Mercedes-Benz GLS63 AMG, N/A
• Fits 2013-2019 Mercedes-Benz SL63 AMG, N/A
• Fits 2014-2018 Mercedes-Benz CLS63 AMG S, N/A
• Fits 2013-2018 Mercedes-Benz G63 AMG, N/A
• Fits 2012-2017 Mercedes-Benz CLS550, N/A
• Fits 2012-2017 Mercedes-Benz E550, N/A
• Fits 2017 Mercedes-Benz Maybach S550, N/A
• Fits 2012-2017 Mercedes-Benz S550, N/A
• Fits 2011-2017 Mercedes-Benz S63 AMG, N/A
• Fits 2016-2017 Mercedes-Benz S63L AMG, N/A
• Fits 2012-2016 Mercedes-Benz E63 AMG, N/A
• Fits 2014-2016 Mercedes-Benz E63 AMG S, N/A
• Fits 2013-2016 Mercedes-Benz GL550, N/A
• Fits 2013-2016 Mercedes-Benz GL63 AMG, N/A
• Fits 2014-2016 Mercedes-Benz SLK55 AMG, N/A
• Fits 2013-2015 Mercedes-Benz ML550, N/A
• Fits 2012-2015 Mercedes-Benz ML63 AMG, N/A
• Fits 2011-2014 Mercedes-Benz CL550, N/A
• Fits 2011-2014 Mercedes-Benz CL63 AMG, N/A
• Fits 2012-2014 Mercedes-Benz CLS63 AMG, N/A
• Fits 2013-2014 Mercedes-Benz GL450, N/A