Thanks Dennis for the very useful information. Do you have a good procedure to remove the broken stud and how do I screw the new one into the cylinder block? I think I have two of those soft studs, one broken, the other one should be replaced too. Thanks again

Leo

Dennis Haynes <dhaynes@optonline.net> wrote:
The nut going soft while tightening is actually a sign the stud was
stretching. If the engine was once overheated, all the studs are
suspect. If there is any corrosion on them, they must be replaced. You
will need to remove the head, and at least lift the cylinder out slight
to replace the stud. They are fairly tight in the case so some
imagination will be needed to remove it. Any others that tightened
weirdly should also be replaced. It is also a good idea to replace the
nuts or at least chase the threads with a quality tap. Never fill the
nuts with oil or sealer. Only apply to the stud threads. Good Luck.

Dennis