I am having problems with my serpentine belt jumping off during the rain. I have narrowed it down to either the grooved idler pulley which has some play approx (1/8" rock) or the belt tensioner in which others think is the problem. Does anyone know how to remove the grooved idler pulley. It seems very close to the frame and I would like to know before I get started wether or not this involves dropping the engine, similar to the smooth idler pulley.