If you have access to a oxy acetylene torch, heat the nuts to very warm/almost red and then spin them off with the impact gun. The nut will heat and soften while the stud will remain hard. Works 99.9% of the time.
If you don't have access to these two tools, then, as Dave suggests, sharpen a large chisel and split the nut. Even just making a good chisel mark in them may spread them just enough to loosen them.
|