For some parts, the replacement might not look the same as the original, like filters and brake pads. But when it comes to the alternator pulley, don’t take any chances.  

The original alternator removed by the technician was equipped with an over-running alternator decoupler pulley, or OAD, made by Litens. An OAD pulley is designed to decouple the alternator from the accessory drive-belt system and absorb vibrations from the engine and the other components of the belt drive system. 

While a solid pulley can transfer the movement from the belt to the alternator’s rotor, the absence of the OAD will impact the efficiency and longevity of the entire belt-drive system.  

While an OAP or solid pulley will not leave the customer by the side of the road in the coming months, it will cause extra stress on the accessory drive-belt system and even the engine. The results might be a premature failure of the alternator and decreased belt stability that could result in premature wear and failure of the belt and tensioner.

This video is sponsored by Litens.