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
Replace an Alternator Decoupler Pulley
Replace an Alternator Decoupler Pulley OAD What is an Alternator decoupler pulley (ADP)? Many late model vehicles are equipped with alternators fitted with an Alternator Decoupler Pulley or simply, OAD. The OAD is one-way clutch and shock absorber. It’s job is to improve engine efficiency. Car makers started installing OAD pulleys with the 1999 models. Compare the diameter of the alternator pulley to the diameter of the harmonic balancer and you’ll see that the alternator pulley is generally 1/3 the diameter of the balancer. That means the alternator rotates 3 … Read More