A common question we get asked is ” I think the problem may be my decoupler pulley, but how do I know”? To answer that question, we went to one of our favorite companies Litens OAD. Here are a few of telltale signs your decoupler pulley needs changing.
1) The internal clutch breaks – This will mean the pulley will still go around but the rotor of the alternator will be stationary. The alternator will not charge and the light will come on.
2) Clutch slips – This means the pulley will still go around but the rotor of the alternator will not spin at full speed. The alternator will have intermittent charge or low charge and the light may or may not come on.
3) Decoupler bearing wears out and generates a buzz noise when the engine is shut off.
4) Decoupler spring fractures and gives reduced amount of isolation. This could be a ticking sound or excessive tensioner motion.
If you do need an alternator decoupler pulley, you can always get them at www.AmericanEnginesCo.Com or email AmericanEngines@gmail.com