Cloyes B40409 Accessory Drive Belt Kit

Accessory Drive Kit Overview

Cloyes B40409 is a specific-fit accessory drive belt kit for Mercedes-Benz applications. It combines the main wear items in the serpentine drive system into one matched repair package for consistent belt tracking and system operation.

Fits 2006-2015 Mercedes-Benz models listed below, with application-specific coverage by model and engine configuration. Part number B40409 is built as a standard replacement kit for the accessory drive system.

Key Features

• Specific-fit accessory drive belt kit for confirmed Mercedes-Benz applications.
• Grooved EPDM belt construction for resistance to stretching and cracking.
• Steel pulley construction for stable belt alignment and reduced vibration.
• 6-groove pulley design for proper belt engagement.
• Standard replacement grade for routine accessory drive service.

Detailed Description

This Cloyes accessory drive belt kit is engineered for vehicles that rely on a serpentine belt system to drive engine accessories. The kit is centered around a grooved black belt and steel pulleys, with components selected to restore proper tension, alignment, and smooth operation in the accessory drive path. Part number B40409 is a direct service solution for Mercedes-Benz models including E-Class, ML-Class, GL-Class, and others listed in the fitment data.

Cloyes B40409 is intended for buyers replacing worn belt-drive components at the same time rather than servicing one part at a time. The matched kit format helps maintain consistent belt routing and pulley engagement across the system. This part cross-references Monroe Shocks & Struts (e.g., BK5377) for the same application.

What It Is Used For

• Replacing a worn or stretched accessory drive belt.
• Addressing pulley wear that can affect belt tracking.
• Restoring proper belt tension in the serpentine drive system.
• Correcting noise or vibration from aging belt-drive components.
• Servicing the accessory drive system on Mercedes-Benz vehicles listed in fitment.

Installation Notes and Tips

Verify the exact vehicle application against the fitment data before ordering. Inspect the belt path, pulleys, and tensioner condition during installation so the full accessory drive system is serviced together. Confirm engine-specific notes where shown, including the listed Mercedes-Benz C350 and E350 applications.

Quality Assurance

Cloyes backs this accessory drive kit with an industry-leading warranty and technical support. The brand also notes more than a century of professional use in drivetrain and engine-related components.