What is an Alternator decoupler pulley (ADP)? An alternator decoupler pulley or Overrunning Alternator Decoupler Pulley or simply, OAD is a one-way clutch mounted on the front of the alternator. It’s designed to improve engine efficiency and increase MPG by reducing drag on the engine. Car makers started installing OAD pulleys with the 1999 models. How can an alternator create drag? The alternator rotor is heavy and is spun by the drive belt to create power. However, engine power is created in pulses as each cylinder fires. So the drive … Read More
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