broken crank bolt 97 3.1 trooper how do i get it, out how far into the crank does it go, where do i get a replacement bolt, is it worth trying to fix, are valves bent etc etc. engine started sounding funny noisey 2 days later asked friend to listen started up 10 seconds later at idle it died. crank pulley fell off took fan off put finger in the hole(ha ha ) half the bolt is still there . any ideas.