 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? So I ordered a cover and marked the location of the crank pulley against the edge of the oil pan, and here's where I went wrong. After taking off the pulley, I didn't mark the crank sprocket against the block.