Postby Hasbeen » 11 May 2015 06:48
Not sure that electrolysis or corrosion of the studs is the problem.
I had 3 of my studs come out easily with a large screw driver turning them easily.
A couple came with double nuts locking to the stud. Once started a screw driver brought them the rest of the way.
All bar one of the rest surrendered when the nut was welded to the studs. Again, once started they came, actually by fingers.
The last took 3 goes to weld a nut well enough to the stud. I was not game to use a breaker bar, as I felt the stud would shear. It was a heavy duty impact wrench to start it, then again it came easily once started.
I believe the studs bottom in their holes, [or the top of their threads lock on the block], effectively locking them in place. None of mine had any corrosion to the head or the block. Most would screw in & out with fingers, after the first removal.
On another engine I checked how the studs worked. I screwed them right in, then back out 2 turns. I marked the studs, & checked how they performed. with the stud holes cleaned & the studs coated with copper slip, all bar 2 screwed half to a full turn into the block as the nuts were tightened.
This may not have been a good idea, but so far no trouble. The proof will be if that head has to come off again some time.
Hasbeen
