A worn or failing drive belt idler pulley on the M50, M52, M54, S50, S52, S54, S65, and S85 engine families is more than a noise issue — a seized or broken pulley can cause the drive belt to fail suddenly, resulting in damage to the radiator, hoses, cooling fan, and other critical engine bay components. This direct replacement idler pulley restores correct belt deflection and guidance around the accessory drive system, reducing abnormal bearing noise and friction associated with an ageing factory pulley. A straightforward replacement that protects the wider engine bay from the collateral damage a failed pulley can cause.

Features:

• Direct replacement for OEM part numbers 11287841228 · 11281748130 and related references – bolt-on fitment with no modification required
• High-quality metal and plastic construction comparable to factory quality – reduces abnormal bearing noise and friction caused by pulley ageing
• Guides the drive belt correctly around accessory attachments on M50, M52, M54, S50, S52, S54, S65, and S85 engine applications
• Prevents a seized or broken pulley from damaging the radiator, hoses, cooling fan, and surrounding engine bay components
• Offset bolt hole design – confirm your application before ordering (see compatibility notes below)

Specifications:

• Condition: 100% Brand New
• Type: Drive Belt Deflection / Idler Pulley
• Compatible Engines: M50 · M52 · M54 · S50 · S52 · S54 · S65 · S85
• Tensioner Type: Hydraulic Tensioner Only
• Bolt Hole: Offset (not centred)
• OEM Replacement Part Numbers: 11287841228 · 11281726181 · 11281730571 · 11281738061 · 11281738605 · 11281748130 · 11281748131

Fitment:

• BMW 3 Series E36 318i (1994–1995)
• BMW 3 Series E36 325i · 325is (1992–1995)
• BMW 3 Series E36 328i · 328is (1995–1998)
• BMW 3 Series E46 323i · 323is · 323Ci (1998–2000)
• BMW 3 Series E46 328i · 328Ci (1999–2000)
• BMW 3 Series E46 325i · 325Ci · 325xi (2001–2005)
• BMW 3 Series E46 330i · 330xi · 330Ci (2001–2006)
• BMW 5 Series E39 525i (2000–2003)
• BMW 5 Series E39 528i (1998–2001)
• BMW 5 Series E39 530i (2001–2003)
• BMW X5 E53 3.0i (2001–2006)
• BMW Z3 E36 2.8i · 3.0i (1997–2002)
• BMW Z4 E85 2.5i · 3.0i (2003–2005)

Contents:

• 1x Drive Belt Deflection / Idler Pulley

Benefits:

• Eliminates abnormal belt noise and bearing friction associated with a worn or ageing idler pulley
• Prevents sudden pulley failure from causing collateral damage to radiator, hoses, fans, and other engine bay components
• Direct bolt-on replacement restores correct belt deflection and drive system geometry immediately
• Factory-comparable quality ensures reliable long-term performance across the supported engine families

Installation Notes:

• Compatible with hydraulic tensioner vehicles only – will not fit mechanical tensioner applications
• This pulley features an offset bolt hole – it cannot be used on models with a centred bolt hole. If your application requires a centred bolt hole, you will need part number 11281748131 instead
• Compatible with clockwise turning power steering pump applications only
• Verify your existing pulley part number against the replacement references listed above before ordering
• If unsure about your tensioner type or bolt hole configuration, contact our team with your chassis code and engine code prior to purchase

Warranty:

• 12-month standard warranty from date of purchase
• Contact our support team for assistance with any issues