Replacement BMW Serpentine Drive Belt Hydraulic Tensioner and Idler Pulley Set for BMW E46 E36 E39 X5 E53 Z4 E85 E86 | Part No. 11281748131, 11281726343 and more.

Restore Engine Belt Tension & Reliability – BMW Tensioner & Idler Pulley Set

Ensure your BMW’s serpentine belt system runs smoothly and safely with this replacement drive belt tensioner and idler pulley set. Designed for older inline-6 models, this kit replaces worn or noisy components that can lead to belt slippage, misalignment, or engine accessory failure.

Over time, pulleys and tensioners can wear out due to heat, vibration, and age—resulting in squealing belts, poor cooling performance, or even complete belt failure. This high-quality replacement set restores proper tension and alignment, keeping your alternator, power steering, and water pump operating reliably.

• OEM-Style Replacement – Designed for a perfect fit on M52, M54, and S52 engines
• Eliminates Belt Noise – Replaces worn pulleys and spring-loaded tensioners
• Improves Engine Efficiency – Keeps all belt-driven accessories running smoothly
• Durable Construction – High-quality materials for long-term performance

Recommended for any BMW with high mileage or during belt replacement service.

Restore peace of mind and prevent costly breakdowns with this proven upgrade.

FITMENT: Compatible with BMW inline-6 models using hydraulic belt tensioners, including: E36, E39, E46, X5 E53, Z4 E85/E86

IMPORTANT NOTES: 

1. Offset Bolt Hole Design – This deflection pulley features an offset mounting hole and is not compatible with models that require a centered bolt hole.
2. Clockwise Rotation Only – Designed specifically for vehicles with a clockwise-rotating power steering pump.
3. For Hydraulic Tensioner Systems Only – Not compatible with vehicles using a mechanical belt tensioner. This pulley is intended only for models equipped with a hydraulic belt tensioner setup.

Replaces OEM Part Numbers: 11281748131, 11281726343, 11287841228, 11281726181, 11281730571, 11281738061, 11281738605, 11281748130.

(May replace additional related part numbers depending on configuration)

Please refer to the “Fitment” section in the product description for compatibility details.