When i was about to leave work and cranked my car up, i heard a popping noise so i popped the hood. the tensioner was acting funny and the belt was popping on it front to back. I called my buddy that works at a shop and he came to look at it. he checked the tensioner out and spun the pulleys to make sure they were all spinning freely and they were. so i cranked it for him and he watched it for a minute then i turned it off. well my damn crank pulley/HB is loose. not just the crank pulley but the whole thing that sits flush against the block. we messed with the bolt that holds the pulley on but we couldnt turn it by hand(didnt have any sockets or anything and its raining). my question is, any ideas what might be wrong? he said that it could be a pin is messed up or gone or something may be wallered out.