BMW E9X 335i Belt Idler Pulley 80mm OEM 11287556251

Restore smooth accessory belt operation with this INA 80mm belt idler pulley for BMW E9X 335i models. This OEM-quality idler deflection pulley supports the engine’s serpentine belt system and helps maintain consistent belt tension as the belt travels around the alternator, air conditioning compressor, and power steering components. A properly functioning pulley helps reduce belt vibration, noise, and uneven wear.

Manufactured by INA, a trusted original equipment supplier, this pulley provides a reliable replacement for a worn, noisy, or damaged factory unit. Its precise 80mm diameter matches the specified application and supports proper belt routing when installed with the correct BMW hardware and related components. Replace the pulley during accessory belt service to help protect the belt system and maintain dependable engine operation.

• OEM-quality INA belt idler pulley for BMW E9X 335i applications
• 80mm pulley diameter for the specified belt routing and fitment
• Designed for the alternator, A/C, and power steering accessory belt system
• Helps reduce belt noise, vibration, and premature belt wear
• Ideal for routine maintenance or replacement of a worn idler pulley

This BMW belt idler pulley replaces BMW part number 11 28 7 556 251, also written as 11287556251. It is a practical choice for restoring smooth accessory drive performance during a serpentine belt replacement or pulley service. Inspect the belt, tensioner, mounting bolt, and surrounding components before installation. Replace any damaged or excessively worn parts to support long-term reliability.

Important buyer note: This is the 80mm pulley. Confirm the pulley diameter, vehicle year, engine configuration, and original part number before ordering. Fitment can vary by model and production date, so compare the existing component and verify compatibility for your specific BMW E9X 335i.