 When you start to look at tension adjustment, the non-technical word is wank. There was enough wank in that belt that it was probably slapping against the cover as it came around. Once I had the serp belt and engine mount off, Billy continues, I turned the engine to line up the cam with its timing mark and then went to double-check the crank pulley against the mark on the lower timing cover. Well, lo and behold, no lower timing cover. No wonder the belt looks so rough. Yeah, that's kind of bad when the parts are falling off the car all on its own, right?