Valeo Alternator Pulley and Protection Cover Electrical Systems for Passenger car

Alternator Pulley and Protection Cover

What is an alternator pulley?

An alternator pulley, also known as an Overrunning Alternator Pulley (OAP), or freewheel pulley, is the mechanical link between the alternator and the engine output crankshaft pulley. The alternator pulley drives the alternator which allows the battery to be recharged. The alternator pulley is a spare part of a complete alternator.

What does an alternator pulley do?

The freewheel pulley is used to:

  • Protect the belt drive system by filtering engine vibrations, improving the belt drive longevity
  • Reduce belt drive noise, vibration and harshness (NVH) for optimum driving comfort
  • Stop friction losses caused by belt slippage
  • Allow the alternator rotor to turn in freewheel mode when the engine is slowing down or stopping, for maximum system efficiency, fuel savings and reduced CO2 emissions

Valeo: alternator pulley specialists

With its strong leadership in Original Equipment (O.E.) and more than 30 years of remanufacturing experience, Valeo provides the aftermarket with a wide range of alternator pulley solutions.

Made of the finest possible materials and bearing, Valeo’s freewheel pulleys have been tested according to Valeo’s high-quality standards to ensure the robustness of each individual part. And with 107 parts numbers dedicated to 14,000 vehicle applications worldwide, Valeo is sure to have the alternator pulley you require.


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