Mike,

I just did this on my 81 air cooled.  I don't have the
CA exhaust, but I think the nut you are talking about
is on the top stud from the crossover, where mounted
to the heat exchanger.  How I got to mine was with a
1/4 inch drive socket set.  I used a 13mm socket, then
a universal, then two extent ions.  It was clunky, but
it worked.

In my case I could only get one out.  The other side
was too rusted to grip with a 13mm, and too big for a
12mm.  I was replacing the crossover, so I cut it
down, until just the flange was left.  I then ground
out the stud from the back of the flange.  Once done,
the flange separated from the heat exchanger.

Good luck,

Tony

--- Paul Guzyk <pguzyk@GMAIL.COM> wrote:

> I once had a 13mm bolt that was in a place too tight
> to turn a wrench.
>
> I took a 13mm combination wrench and sawed it in
> half with a hacksaw.
> With this shorter wrench, I was able to get the box
> end on the bolt
> and turn it little by little.  Maybe that will work
> for you?
>
>
>
>
>
>
>
> On 6/12/05, Mike Jeffrey <oldbus@gmail.com> wrote:
> > Hello! and happy Sunday,
> >
> > I'm looking for tool advice... there's a bolt on
> the exhaust system of
> > my '83 CA aircooled that's particularly tricky to
> get at. It's the top
> > bolt (originally a stud) at the junction of the
> right-side heat
> > exchanger and the cross pipe. All of the tin is
> installed around it,
> > so access is very tight - I can't turn it with a
> wrench, and my
> > ratchet is too bulky.
> >
> > Can anyone recommend a tool that fits in there
> well enough to turn the
> > bolt? Some strange ratchet, a 90 degree bend,
> etc...? It seems that
> > there's enough space for the socket in there, but
> not much more than
> > that.
> >
> > Thanks so much! Any help much appreciated.
> > Mike.
> >
>

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