[T3] 73 type 3 auto trans IAD?

William Jahn willjahn975 at gmail.com
Sat Jul 15 15:29:41 PDT 2023

For now I'm just going to clean up the stock 73 auto trans IAD. It has very
, very little up/down side to side play/. Make a plate to block off the EGR
tube and a gasket. I'll just save the manual trans 72  and right now just
use the back cover since it's not bowed like mine is. It's much better than
the worn out 72 auto trans one I have on it now and should get me through
years of driving . Sure if I was into rebushing these I would but you need
a reamer and bushings just like those who do the carburetors. I don't know
of anyone who does the fuel injected IAD's.  I imagine  people who do the
cards could. As far as I know this could be the reason I have that high
idle I spoke about a while back.

 With a bit of work and time I think I can replace the IAD with the runners
in place. Last time I removed them and even then the IAD was not easy to
get at the two bolts and nuts. This time I have shorter metric sockets and
wobble end extensions both in 3/8 and 1/4 drive. And two full sets of
metric combination wrenches. That will make it so much easier than dealing
with a 3/8" drive universal and a not deep but not short socket. Plus the
PCV tube on the back cover makes this task a bit more difficult / not

On Sat, Jul 15, 2023 at 12:44 PM Jim Adney <jadney at vwtype3.org> wrote:

> On 15 Jul 2023 at 12:14, William Jahn wrote:
> >  The issue now is the IAD has so much play on the lever side it binds
> once
> > the engine cools down after a drive but it seems to work fine driving and
> > it does not stick again until the next cool down. However I am certain
> > there is a good amount of a vacuum leak there, plus it has to affect the
> > TPS in some manner even though the play is at the cable end.
> Sounds like a really good option would be to send the worn IAD to one of
> the
> people who rebuilds carbs and can sleeve/bush the butterfly shaft. This is
> a
> standard job for those folks.
> >  I have two options. Use the 73 I have or to use the 72 manual trans. The
> > problem with that is it does not have the two vacuum ports for the auto
> > trans. It has bosses for them and I can drill the holes and tape for
> 1/16 "
> > NPT and install them. It's more work but can be done and I can swap the
> > auto trans lever over .
> Drilling and tapping sounds like a lot of work, plus you would have to get
> the
> ports exactly the right size and one of them has to be positioned exactly
> right.
> >  I know the answer will be use the 73 which is the easiest but In also
> want
> > a spare so I can modify the 72 IAD ..I don't really need the kick down
> > because I never use it ,
> I agree that the kick down function is of limited use.
> >  I am going to try to swap the IAD without removing the runners. It has
> > been  done, it's just not as easy.
> If your runners are nicely lined up with the IAD ports, it won't be too
> hard.
> > I'm not sure about the intake
> > gaskets , I put new ones on in mid 2019 so as long as the paper on both
> > sides lives they should be fine. If not then I need two more of these.
> I'm
> > just going by the Bentley stating they must be replaced anytime the
> runners
> > are removed. I never tried reusing them so I don't know.
> I reuse them whenever possible. If the paper is torn, scrape it all off
> and glue
> new paper and press against a flat surface. Trim when dried.
> >  The only question in all of this seems my best bet is using the 73 IAD.
> I
> > did try to loosen the two small screws on the 73 throttle late but on
> this
> > one they are peened to they will not come out without filing the peen off
> > this seems to be done to keep them from falling out . The 72 manual trans
> > are not peened. I guess this was some after thought. .
> I thought they were all peened. The peening may have been different in '72.
> I still recommend getting someone who does this work regularly to do this.
> Sure, you could probably figure out how to do it yourself, but how many
> tries
> would it take you to do it well? I figure I have to do a job at least 3
> times to
> get it right.
> You could figure out what the screw size was and buy a bag of 50 from
> McMaster-Carr, then practice on some of your other IADs. Once you were
> set up to do this, you could offer this as a service to anyone. Or just
> find
> someone who has already gone thru all this pain.
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
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