Hi Bud,
Kelvin called that difference in length "specification drift" when he
and I discussed the diff in length between my old emergency brake cable
and the new one I got from Moss. ;^) Nothing much Moss can do about
that sort of thing but look for a new supplier.
When I rebuilt my 18GH engine last winter I wire-brushed all the studs
and discarded the ones that were badly pitted, looked slightly elongated
or had boogered threads. Then I went out to Elizabeth and Fisher
Jones's place with a 12 pack of Shiner Bock. We went thru his stud bin
(gurgle - gurgle), 'til we found a few good ones (burp). Those are the
studs that are in there now. One of those little details.... Too bad
you did in a head gasket in finding out
So ya got the thing back in there and the head on? How long 'til the
big day when it goes Varoom?
Cheers,
CR
Bud Krueger wrote:
>
> Hi folks,
>
> Just thought I'd tell you about some engine stud anomalies that I've run
> into during the rebuild of my engine.
>
> 1) Soft rocket bracket studs. While torquing down the rocker bracket nuts I
> sensed that something wasn't quite right when I tried to go from 20 to 25
>ft-lbs
> on the front stud. I stopped and pulled things apart. The stud was actually
> elongating itself below the nut! Had I continued to twist the wrench, I have
>no
> doubt that the stud would have broken. This was a brand new stud (Moss
> #329-980) purchased from a Moss distributor. (I bought a complete set of new
> engine studs for the rebuild.) I noticed that the two long rocker bracket
>studs
> didn't show any type of nitride finish, just shiny steel. I'm very glad that
>I
> didn't try to hoist the engine via these studs for reinstallation. That would
> have been catastrophic. You might want to cast a leery eye on any studs that
> you get that don't show some sort of treatment to the surface.
>
> 2) Short head studs. Tonight I intended to install the head with a new set of
> cylinder head studs. (I replaced the faulty rocker bracket studs.) Even
>before
> I got the torque up to 40 ft-lbs I could see that something was amiss on the
> short studs. There wasn't any thread showing above the nuts. I'm from the
>old
> mil-spec school that says that there should be between 1.5 and 2.5 threads
> showing after the nut. In this case the end of the stud was virtually flush
> with the top of the nut! I pulled things apart and measured the studs (Moss
> #328-950). The new ones had a mean length of 4.482". The old ones measured
> 4.552". The threads are 3/8-24, which is about .042"/thread, so this
>difference
> of .07" is about 1.7 threads. I put the old studs back in!
>
> --
> Bud Krueger
> http://home.ici.net/~bkrueger/
> 52TD
> 77MGB
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