What I think is missing from all of this talk of "how hot do we need to go" for these bolts is what is going on with a nut and a bolt as we heat them in an attempt to let them turn loose from one another.
All that we are trying to do is take advantage of how different metals, or differently shaped metals of the same alloy, respond differently from just a little heat. This little bit of heat will cause slight expansion of one type of metal faster than the other, resulting in separation of the mating surfaces. This also takes place with a nut and a bolt made of the same alloy, due to the difference in shape and mass of the two parts.
Having said all of that, with these particular nuts and bolt, I make sure that there are no cotter pins in the end of the bolts, I heat the nuts until the grease/oil/dirt catches on fire, put out the fire, and put an air impact wrench on the nut and a box end wrench on the bolt head and buzz them off. If they break, then I know that it was time to replace them anyway. I have never broke one this way and they always came off.
Carl
Last edited by 52Carl; 03/03/2019 5:07 AM.
