well i dont know alot, but i can safely say the louder it squeals, the worst its getting.lol and if you look closely at the belt, you'll notice that itll start to get cracks through it. which aint a good sign!(easier to inspect if you take it off) As far as the tensioner goes, i noticed mine was bad when i took off the belt and went to put it back on I had to tighten it back manually. it should be spring loaded which means as soon as you let pressure off the wrench it snaps back to the original position. hope this helps!