The difference being the glow plug sees really high temps about never
and the exhaust stud sees really high temps about always.

I have BTDT.  Fought it for a couple years before I finally gave up and
pulled the exhaust and thermostat housing to get to the l/h rear upper
stud. Took a couple hours to install the Keen-sert and now it's FIXED! I
had tried every band-aid known to man.  JB Weld, Loctite, helicoil...
Finally Keen-sert. No more pulled stud.

Jim

Bradley Flubacher wrote:
>
> Contrary to what everyone has said so far, I have had recent luck with
> JB weld. About 3,000 miles ago, I JB welded a glow plug into a diesel
> head. So far so good... although the other responses you got have me
> worried!
>