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OAD – Overrunning Alternator Decoupler Pulley

All Pulleys Are Not Created Equal
The Elite® Overrunning Alternator Decoupler Pulley features the latest in alternator pulley technology, and currently more than 70 million vehicles in North America are now equipped with an OAD vs. an OAP. Elite® OADs reduce noise, vibration and harshness typical for today’s lean engine designs, while improving fuel efficiency and lowering the risk of premature accessory drive component failures. The OAD not only features a one-way internal clutch, but it also has a steel torsion spring that absorbs increased vibrations, resulting in a smooth and quiet drive.

It’s critical to replace an OAD-equipped alternator pulley with another OAD unit. Without it, the vehicle could experience excessive belt flutter, worn or broken tensioners, extreme belt wear, belt ejection and unwanted noise from belt vibration and slippage. The Elite® OADs provide an exact OEM match for premium performance.


Controlled Vibration. Smooth Performance

Lower Systems Tension Improves

  • Vehicle noise level, vibration, harshness
  • Front-end accessory drive component life
  • Fuel economy



  • For cylinder deactivation
  • Idling and cruising
  • Transmission shift belt noise
Elite OADs include a patented internal torsion spring that is tuned to the specific engine application. The spring absorbs base-engine vibration before it reaches the alternator. It also connects, but isolates the alternator pulley from the rotor, which in turn effectively eliminates the vibration felt by the driver. OADs include a one-way clutch (decoupling feature) that enables the alternator to coast freely if belt speed suddenly decreases, such as an engine shut-down or a transmission shift.


Further Information