So I'm new to domestics and I have a 2001 Pontiac Grand Prix, 3.1 liter. I went to replace the serpentine belt and noticed the crank pulley seems to have moved out of alignment with the other pulleys by half an inch. I tried to tighten the main bolt--first clockwise then counterclockwise (thought maybe it was reversed threaded) and nothing happened. I had the car for a year and never had a problem till the belt broke rescently (probably the misalignment). How do I fix this problem? The pulley doesn't seem to be wobly, but I don't have a clue on this one--please help....