I've bought an xe with gearbox yesterday with apparent goosed bottom end. Got it home and stripped gearbox off - only for flywheel and clutch to fall off with it. It's sheared 7 bolts in end of crank (one missing I think - still to check sump). Has anyone came across this before and any idea what might cause it? Only thing I can think of is the bolts have been stretched, reused and snapped under strain. Any help appreciated.