Once again I need your help. Got motor put back in and I went with the suggestion on putting grease on bolt threads. Ran into another problem. Tried starting motor and it was backfiring. Checked TDC timing marks. Seems TDC was lined up with #2 cylinder. Seems the key sheared off. Pulled the flywheel. The part broken into the crankshaft is really stuck in there. Almost looks welded in there. Any tricks to remove this or do I just need to be real careful with a drill. I dont have a welding torch. I do have a propane torch. I am thinking heat. Any help will be appreciated!