how to remove a crankshaft bolt rounded off

[jsp]

How to remove a crankshaft bolt that is rounded off?

I am repairing another TU engine on an engine stand but, the crankshaft bolt wont come off.

[Peter.N.]

If you can find a socket that is slightly smaller than the bolt and hammer it on, that would be the easiest way, if that won't shift it weld a large nut onto the head of the bolt, not only will that give you more purchase but the heat will expand the bolt, hopefully loosening it.

Peter

[Paul-R]

If the socket is bi-hex (has 12 points) then a single hex socket might do the trick. preferably one that is a fraction smaller than the correct size - maybe an imperial of NF socket in place of the prescribed metric one.

[DHallworth]

The other option is a cold steel chisel and a hammer, hold it level with the bolt to mark it, then once it's cut a small groove in the edge, turn the chisel so it's almost at 90 degrees to the bolt and beat it with a lump hammer in the direction you'd be undoing the bolt in.

That method has saved me a load of times!

David.

[Sloppysod]

Question, I do not know this engine, but is this a lefthand threaded bolt? Are you trying to move it the right way?