Question on TTY bolts
I understand that TTY bolts are designed to be used only once, but was just wondering exactly when they became unusable again.
I was told that after you torque them down to specs you could unbolt them, remove heads, and reinstall them as long as they were not heated up by engine. It was explained that the actual torquing process was not complete until the engine had warmed up, causing the bolts to expand and then cooled off causing the bolts to contract and tightening even further and completely sealing the head. The yielding part is the process of stretching and contracting the bolts during the warming and cooling off of the engine.
I always thought that the bolts stretched as they were torqued down on the engine and were useless if torqued and then removed.
Thanks for the input.