Posts Tagged: alternator decoupler pulley
Why carmakers use an alternator decoupler pulley
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
How to replace an alternator decoupler pulley
Learn how to replace an Alternator Decoupler Pulley (OAD) or an Overrunning Alternator Pulley (OAP) The alternators in many late-model vehicles are equipped with either an overrunning alternator decoupled (OAD) pulley or an overrunning alternator pulley (OAP). Both pulley styles are designed to allow the alternator to decouple from the drive belt, allowing the alternator to free-wheel during engine deceleration. However, the two styles are designed differently and are not interchangeable. So, when the pulley fails, it’s important to replace it with the correct type. How to replace an OAD … Read More