BMW Drive Belt Idler Pulley for M57N2 - INA 11287799859

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INASKU: 5320605100

Sale price$44.00 Regular price$91.00


Part number 11287799859 - Suits BMW M57N2 X5 E70 Series

*NOTE: This product is an OE BMW Product, without the BMW logo, with a considerably cheaper price tag. 


Referred to as a deflection pulley, 80mm diameter

Your BMW's idler pulley is tucked in the front of the engine accessory rack. Most often this part is overlooked for replacement until its too late. Usually a worn idler pulley will cause the drive belt to squeak or squeal upon starting the engine. We recommend regularly inspecting all pulleys in the drive belt system and to replace if the bearings feel loose or "crunchy".

Drive Belt Idler Pulley

The drive belt idler pulley works in conjunction with the tensioner pulley/tensioner assembly to maintain tension on the belt as well as guide the belt. Idler pulleys are also used to achieve ideal belt routing around the engine drive accessories such as the power steering pump, water pump, A/C compressor, and alternator.

The idler pulley is an often overlooked maintenance item but it is just as important as the belt tensioner itself. In most cases it is recommended to replace the idler pulley at the same time as the belt tensioner.

Drive Belt Idler Pulley Failure Symptoms

  • Visible wear or grooves on pulley
  • Belt squealing
  • Chirping or grinding sounds coming from pulley bearing
  • Odd or uneven belt wear
  • Misalignment of pulley when compared to mounting surface

About INA

Almost every modern passenger car contains an INA engine and transmission component. INA is a global manufacturer of OEM (Original Equipment Manufacturer) roller bearings, linear motion, engine components, plain bearings and precision components meaning that the original parts removed from your car will most likely have INA stamped right on it.

Today INA is a division of the Schaeffler Group, which also includes FAG and LuK, they are the second-largest bearing manufacturer in the world. Their bearings are used in the space shuttle and the Millennium Wheel in London. Schaeffler has manufacturing facilities all around the world including Danbury CT. 


This is the original part used by the vehicle manufacturer when it left the factory - in other words, a Genuine product without the logo on it and without the premium cost. We recommend OE replacement as best options for quality and price. Vehicle manufacturers (BMW, Volvo, etc.) do not manufacture many products themselves, rather they contract their Original Equipment Manufacturers to do so. The products that we list as OE are guaranteed to be the exact same part that was on your car when it left the assembly line. In some cases they are even better quality than what is currently available in Genuine because over time some Genuine contracts get changed to save money. All of these parts will be stamped with the OEM’s brand name such as Bosch, Hella, or Lemforder but due to contractual agreements the vehicle manufacturer’s logo cannot be on the product and may be removed from the part.

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