Quote:
Originally posted by john walker's workshop
exhaust nut, heat the nut, not the stud. nut comes right off.
flywheel bolt, use the proper tool, and/or hit the top of the bolt hard with a big ballpeen to loosen the grip. no heat required.
head studs, heat the case to expand the hole and melt the loctite. the loctite, and/or threaded hole will recapture the stud as it cools and the loctite sets again and/or the threaded hole closes up. keeping the case hot and the stud cooler allows easy removal. there have been plenty of times where a stud got tight as it was being unscrewed, and you had to reheat the case to get it moving again. what would heating the stud have done for that situation? this works on most applications, not just head studs.
no dire consequences, just doesn't work as often.
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John,
You are 100% WRONG about the loctiite setting again, IMPOSSIBLE. Once the loctite is heated beyond a certain point it is HISTORY!!! As to heating only the case, which is in intimate contact with the stud, it is simply impossible to heat the case more than the stud. With intimate contact the heat flow is so quick, and complete that there is almost NO chance of any temperature differential between the two. Ever done a heat flow analysis?, It shows that you have NOT or you wouldn't support such a perposterous idea. The time constants are in the sub second range, the temperature differentials in the hundreths of a degree C. I have done hundereds of such analysis for electronics devices for space applications and KNOW, from experience, analysis, and direct measurements with bocou dollars of equipment what this answer is. I have instrumented exactly this type of thing as we have had to take apart very very expensive equipment that had been bolted togather and epoxyed or loctited bolts had to be removed without destroying the equipment.
The discription stating that the heat helps but when removed hurts, simply means that you haven't heated it hot enough to destroy the bond. More heat is the answer.
PS when attempting to run spell check all I get is the following
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