One more method to try.

Melt candle wax or paraffin on the nut/stud. If enough can get down into
the threads - it should turn.

John Rodgers
Clayartist and Moldmaker
88'GL VW Bus Driver
Chelsea, AL
Http://www.moldhaus.com

John Rodgers wrote:
> David,
>
> I haven't had the occasion to have a problem like this on my van - or
> even to try and remove an exhaust nut on a WBX - but in my aircraft
> mechanic days, when this kind of problem arose, a nut splitter was used.
> If that doesn't work - try soaking the nut and stud for 24 hours with
> Marvels Mystery Oil - the actual oil - not that top-overhaul-stuff.
> Then, apply the 200 tap principle using a socket that will fit over the
> stud, but rest the shoulder of the socket against the face of the nut.
> Then try and remove with a proper fitting socket. If it does not loosen
> up - repeat with 200 more taps. If that doesn't do the trick, grind the
> nut down carefully  on one flat, then try to turn the nut.  The grinding
> down should weaken the metal sufficiently for it to stretch just enough
> to break loose. If all that fails - grind the nut off with expectation
> to replace the stud.
>
> John Rodgers
> Clayartist and Moldmaker
> 88'GL VW Bus Driver
> Chelsea, AL
> Http://www.moldhaus.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
>>
>>
>>
>
>