Dorman 300-397 Engine Water Pump Pulley

Engine Water Pump Pulley for BMW Applications

This Dorman engine water pump pulley is a direct replacement for the original pulley used on select BMW models. Built from steel with a bolt-on attachment design, it restores proper serpentine belt operation on BMW 540i, X5, Z8, 740i, 740iL, and 840Ci applications.

Key Features

• Direct replacement engine water pump pulley for specific BMW fitments
• Steel construction for durable, OE-style service
• Bolt-on attachment type for secure installation
• Serpentine pulley and serpentine belt design
• Regular grade replacement part for factory-style repair
• Compatible with BMW 540i, X5, Z8, 740i, 740iL, and 840Ci applications
• Part number 300-397 for easy identification

Detailed Description

Dorman 300-397 is an engine water pump pulley made to replace the original manufacturer’s pulley on specific BMW vehicles. The steel pulley is engineered for serpentine belt systems and uses a bolt-on mounting style, helping restore proper belt tracking and water pump drive performance. This part cross-references Genuine 11511742045 for the same application. Use 300-397 when servicing BMW cooling system components and replacing a worn or damaged water pump pulley on supported models.

Common Problems This Part Can Address

• Cracked or bent water pump pulley
• Wobbling pulley that affects serpentine belt alignment
• Noise from a worn pulley surface or mounting area
• Belt tracking issues related to pulley damage
• Cooling system service requiring pulley replacement

Installation Notes and Tips

Verify vehicle fitment before installation by matching the year, make, and model to the listed applications. This pulley uses a bolt-on attachment and is intended for serpentine belt systems. Installation instructions are not included, so follow the vehicle service procedure and inspect the belt, tensioner, and adjacent cooling components during replacement. Confirm the pulley matches the original configuration before tightening fasteners.

Quality Assurance

Dorman manufactures replacement components for direct-fit repair applications, and this pulley is built to match the original part style for the listed BMW vehicles. Part number 300-397 is intended for factory-style restoration of the engine water pump drive system.

Compatible BMW Fitment

• Fits 1997-2003 BMW 540i, N/A
• Fits 2000-2003 BMW X5, N/A
• Fits 2003 BMW Z8, N/A
• Fits 1997-2001 BMW 740i, N/A
• Fits 1996-2001 BMW 740iL, N/A
• Fits 1994-1995 BMW 840Ci, N/A