Something not addressed here, and perhaps it is not relevant......???
The block side threads are necessarily coarse going into gray iron or cast
iron castings.
Not very scientific on my part, but my head tells me to moderately torque the
blockside fastenings as they are more 'anchors' than anything else.
> The theory of not torquing studs in a head goes like this:
>
> If you torque the stud in the block it bottoms and the pressure of
> engagement is on the back side of the threads, especially towards the bottom
> of the hole assuming that all the threads are uniform. When you stretch the
> stud with head clamping tension it pulls the threads the opposite way,
> especially towards the top of the block. You can easily see that for some
> tension value there will be threads that are engaged on the backside
> (towards the top) and threads engaged on the frontside (at the bottom), and
> some hovering in the middle with no engagement at all. This actually makes
> it more likely that you'll pull threads from the top of the block, or crack
> the metal around the threads.
>
> You never have this problem with bolts, though you do have the problem of
> not getting full engagement if the bolt is not exactly the right length, and
> the higher likelihood of shearing during torqueing since the bolt is being
> turned as it's pulled (a stud is only being pulled).
>
> There simply isn't a good reason to torque studs into a block.
|