the tensioner is spring loaded. put a long wrench or socket with a long ratchet for leverage over the nut and push it in toward the circulation pump. If you're just loosening the nut that wont do anything. the whole pulley articulates in then slip the belt over it and release the tensioner back into place. that nut should be all the way tight and as you turn clockwise it will rotate off center towards the circ pump.
Last edited by bass10after; 05-28-2014 at 12:20 PM.