Dorman 419-036 Accessory Drive Belt Tensioner Assembly - Alternator and Water Pump

Overview of Dorman Accessory Drive Belt Tensioner Assembly 419-036

The Dorman 419-036 accessory drive belt tensioner assembly is engineered for reliable performance in various BMW models. Designed to maintain proper tension on V-belts, this tensioner assembly supports smooth operation of your vehicle's accessory drive system.

• Compatible with BMW 320i, 323Ci, 323i, 325i, 325is, 325xi, 328Ci, 328i, 330Ci, 330i, 330xi, 525i, 525iT, 528i, 530i, M3, X3, X5, Z3, and Z4 models
• Part number 419-036 ensures precise fit and function
• Features a single polyamide 6.6 pulley reinforced with 30% glass fiber for durability
• Includes one pulley bearing with a 40 mm diameter for smooth rotation
• Designed for V-belt systems with a 16 mm inside diameter and 26 mm width
• Counterclockwise tensioner rotation for proper belt alignment

Technical Specifications and Design Details

This accessory drive belt tensioner assembly by Dorman is built to exacting standards to meet the demands of BMW vehicles listed in the fitment. The pulley has an outside diameter of 70 mm and is constructed from polyamide 6.6 with 30% glass fiber fill, providing a balance of strength and lightweight performance. The assembly includes one pulley with no grooves, optimized for V-belt applications. The single bearing incorporated has a 40 mm diameter, ensuring smooth and consistent rotation. The tensioner rotates counterclockwise, matching the original equipment specifications for proper belt tension and alignment.

Applications and Problem Resolution

This tensioner assembly is used to maintain correct tension on the accessory drive belt, which is critical for the operation of components such as the alternator, power steering pump, and air conditioning compressor. It addresses common issues including:

• Excessive belt slack causing slipping or noise
• Premature belt wear due to improper tension
• Vibration or misalignment in the accessory drive system
• Failure of pulley bearings leading to rough operation
• Reduced accessory component performance

Installation Notes and Tips

When installing the Dorman 419-036 tensioner assembly, ensure the belt type matches the V-belt specifications (16 mm inside diameter, 26 mm width). Verify the tensioner rotation direction is counterclockwise to align with the vehicle’s original setup. Inspect the accessory drive belt for wear and replace if necessary to ensure optimal performance. Proper torque specifications should be followed during installation to avoid damage to the tensioner or mounting points.

Quality Assurance and Warranty

Dorman manufactures this accessory drive belt tensioner assembly to meet or exceed OEM standards for fit, form, and function. The use of durable materials such as polyamide 6.6 with glass fiber reinforcement and precision bearings contributes to long service life. This part is backed by Dorman’s limited warranty, providing coverage against defects in material and workmanship under normal use conditions.