This video demonstrates the excessive levels of NVH, belt system stress and other severe issues resulting from the use of a solid alternator pulley on this Ford engine.
This clip shows the use of a variety of "one-way clutch" alternator pulleys on the same engine.
Now we see the smooth, efficient operation of the same engine belt drive system using an OAD™ pulley. The Liten OAD™ pulley was previously referred to as an isolating decoupler pulley or IDP and marketed under the RotorRX brand.
This is a closeup view of the belt tensioner on a vehicle equipped with the wrong alternator pulley design - a "one-way clutch" (OAP). This engine requires an overrunning alternator decoupler (OAD™) pulley.
Note the significant vibration and stress on the belt tensioner. This condition will likely lead to unsatisfactory levels of NVH and reduced component life.
Several vehicle manufacturers now specify isolating decoupler pulleys (IDP) or Litens' overrunning alternator decoupler (OAD™) pulleys for their latest engines due to the extremely smooth, efficient belt drive performance made possible by this technology.
It is never appropriate to use another alternator pulley design in place of an OAD™/IDP on vehicles originally equipped with this technology.