Gates 36479 Accessory Drive Belt Idler Pulley - Lower

OE-Style Accessory Drive Belt Idler Pulley

The Gates DriveAlign Premium OE Pulley 36479 is an accessory drive belt idler pulley built for OE-quality fit and function. It is used on select BMW applications where a smooth backside pulley is required for proper belt routing and tension control.

Compatible with 2007-2010 BMW 335i, 2009-2010 BMW 335i xDrive, 2007-2008 BMW 335xi, 2008-2010 BMW 535i, 2009-2010 BMW 535i xDrive, 2010 BMW 535i GT, 2008 BMW 535xi, 2008-2010 BMW 135i, 2011 BMW 1 Series M, and 2011-2013 BMW 335is in the lower position.

Key Features

• Gates DriveAlign Premium OE Pulley line for OE-style replacement fit
• Accessory drive belt idler pulley for the lower belt path
• Smooth/backside contact surface with no grooves
• Thermoplastic pulley construction
• OE Exact comparison rating for application matching
• Includes pulley, bolt, and retainer in the listed contents
• Cross-references Continental 50053 and Dayco 89518 for the same application

Product Details

Part number 36479 is engineered as a single-pulley solution for accessory drive belt systems. The pulley measures 90 mm outside diameter, 30 mm width, and uses 10 mm and 18 mm bearing bore inside diameters. Its smooth backside contact surface supports belt tracking where a non-grooved idler is specified. The DriveAlign Premium OE Pulley line focuses on OE-quality fit for passenger cars and light trucks, and this unit is listed as an exact OE comparison match.

For BMW 335i, BMW 535i, BMW 135i, and related models, Gates 36479 is a direct-fit lower idler pulley option for restoring proper belt path operation. The part number 36479 is also referenced by other aftermarket catalogs for the same application.

Common Problems This Part Addresses

• Worn or noisy accessory belt idler pulley
• Belt misalignment at the lower pulley location
• Rough pulley rotation that can affect belt operation
• Visible pulley wear on the smooth backside contact surface
• Replacement need during accessory drive belt service on BMW applications

Installation Notes

Verify the lower pulley location and compare the existing pulley dimensions before installation. Confirm the belt routing matches the vehicle’s accessory drive layout and inspect the belt, tensioner, and adjacent pulleys for wear at the same time. Use the included bolt and retainer only if they match the vehicle’s service requirements and follow the manufacturer service procedure for torque and alignment.

Quality Assurance

Gates positions the DriveAlign Premium OE Pulley line as an OE-quality replacement series for passenger cars and light trucks. This pulley is built to OE Exact comparison standards for the listed BMW fitments, including 2007-2010 BMW 335i and 2008-2010 BMW 535i applications.