BMW Alternator Pulley - INA 12317570152

Product Information

An Alternator Pulley is the wheel attached to the alternator shaft that connects to the engine’s serpentine belt or drive belt. As the engine runs, the belt turns the pulley, which spins the alternator’s rotor and generates electricity to charge the battery and power the vehicle’s electrical systems.

Many modern vehicles use an Overrunning Alternator Pulley or Overrunning Alternator Decoupler, which has a clutch-like mechanism that allows the alternator to "freewheel" when engine speed suddenly drops. This reduces belt vibration and improves efficiency.

• Squealing or chirping noises – especially at startup or when revving the engine.
• Battery warning light on dashboard – alternator isn’t charging properly due to poor pulley function.
• Intermittent charging issues – lights dimming or electronics flickering from unstable alternator output.
• Excessive belt vibration or wear – serpentine belt jumps, slips, or frays.

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. We offer INA's full line of OE and OEM components for your European vehicle.

INA Timing Components

The timing drive is crucial for the perfect interaction between the camshaft and crankshaft. Power transmission is possible by means of a timing chain or toothed belt. Schaeffler has more than 100 years of experience in the field of chain drives and works continuously on the further development of its products in 18 research and development centers around the globe. Schaeffler is also a leading manufacturer of idler pulleys and mechanical belt tensioners for dry belt drives and belts in oil. The INA program for the independent aftermarket includes repair solutions with all relevant components for time-saving and professional repairs.

Technology leader in valve train

Irrespective of which future technologies will one day be up to date, road traffic cannot be imagined without classic combustion engines for the time being. In order to reduce consumption and emissions, an effective combustion process in the engine is crucial. The valve train is an important lever for achieving this. With its INA brand, Schaeffler is a pioneer when it comes to technical advancements in the valve train.