I can't help but wonder why the shell has seized? If there was shit under it then maybe but a loose bolt wouldn't cause the engine to lock, it would more cause it to knock like hell not get tighter. I'm wondering if some foreign body was under the shell. You could get away with just fitting another single set of shells as your others are all ok again far from ideal but it would still run fine as long as you polish the crank up. Check the oil galleries too unless its all going in the bin :p
Possible starved oil or maybe even shells in the wrong way round and its just been run on idle so hasn't done atrocious damage and gently got tight and stalled. This is quite easily salvagable.
Possible starved oil or maybe even shells in the wrong way round and its just been run on idle so hasn't done atrocious damage and gently got tight and stalled. This is quite easily salvagable.
![[Image: 22f2b6b2-758b-4c1c-96fb-6fa9c6059b13_zpsf306b56b.jpg]](http://i585.photobucket.com/albums/ss299/Ha11elujaz0rs/22f2b6b2-758b-4c1c-96fb-6fa9c6059b13_zpsf306b56b.jpg)