The 2 belts had came off due to the main crankshaft bolt holding on the crankshaft pulley. So I put the new belts back on still not aware that the pulley bolt was still loose. When I cranked it, it made a loud thumping kinda noise. Belts came off again, then I discovered the bolt being loose. So I tighten it, but now it wont crank, like it may not be getting fire. Could that bolt being loose make the timing belt break or come off? I wouldn't think so since the bolt shouldn't have any thing to do with the timing belt. What do you think?