David,

The best method I have found over the years is to heat the nut up with a
nice torch for a minute then try it again.  If it doesn't budge, heat it
again for another minute.  Go around it and try to avoid heating up the
stud as much as you can.  Then squirt some PB Blaster into the threads.
It will shock cool the stud some which should help things.  What you are
trying to do is use the expansion of the nut to break the bond that has
developed between the nut and the stud over the years.  I have had to
heat things up several times but they always come apart eventually.
Since it is a stud another way to go is to get a very sharp chisel and
split the nut that way.  A good chisel can split a nut in two or three
hits, and you don't have to worry about space like with a nut splitter.

I am telling you the heat works though.  It is simple science.  There is
even a new thing you can buy from NAPA which is a can of ultra cold
spray.  I want to buy this and try the torch and the ultra cold spray
together.  Heat up the nut, then spray the stud with the cold spray.
With just the torch many times the nut become finger tight so I can
imagine what the cold spray would do.

Hope this helps.

Ken Wilford
John 3:16
www.vanagain.com

David Marshall wrote:
> I am trying to replace the turbo on my Syncro TriStar.  It it held on
> to the manifold with three 13mm nuts, these nuts go on to studs which go
> into the manifold.  I really don't want to break the studs.  I
> can put enough pressure on the socket where I know if I go much further
> the stud will break.
>
> Three days of penetrating oil
> "3-IN-ONE 'High Performance Penetrant'" and no with luck other
> than my garage stinks.
>
> I've tried the tighten a bit and
> then loosen which seems to work with allen bolts and light tapping with
> the impact gun... they're still in place.
>
> What should I do
> next?
>
> David Marshall
> VW Adventure Driver and BMW
> Adventure Rider
>
> HasenWerk
> http://www.hasenwerk.ca
>
>