[Healeys] spark eroding experience

[Richard Ewald]

If it goes into the water jacket I would use Teflon paste. Permatex sells it
as well as any good plumbing supply store. Think Teflon tape only a think
paste like wheel bearing grease. Works great.
R

Sent from my iPhone

On Jul 8, 2011, at 17:55, Bert Van Brande <bertvanbrande at yahoo.com> wrote:

> Not related to the plugs.
>
> I rented a small trailer and brought the 100 4 cyl
> engine to a shop in the "valley" here in SoCal to remove a broken generator
> stud from the block.  These holes are drilled right into the water jacket
so
> these studs frequently rust solidly in place.   The stud was already broken
> when I got the car/engine.  In an attempt to remove it I broke an EZ-out.
So
> now there was a hardened steel bit in there as well.  Ouch.
>
> I had another
> broken bolt in the exhaust manifold.  I didn't even try, learned my lesson.
> Both items were fixed in 45 minutes using spark eroding or edm.  A suitable
> electrode is used and an electric discharge or spark disintegrates the
metal.
> Very cool!  Here's a demo video on youtube:
> http://www.youtube.com/watch?v=JRxljmABXL4&feature=related
>
> This technology
> usually can remove studs, bolts, broken taps without damaging the threads.
> The thread was cleaned with a 5/16 BSF tap but there are a couple vertical
> nicks on the threads in my case.  The nicks maybe not too bad to require
the
> use of an insert or helicoil.  I'll make sure to use thread sealant.   I
have
> Hylomar thread sealant (not the advanced formulation which I have as well)
> but I feel more for a Loctite or Permatex style sealant.  I love to hear if
> anyone has good experience with these or other sealants.
>
> Overall I am happy
> with the progress as this was holding me up.
>
> Bert
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