[T3] odd issue RPM hangs.

[William Jahn]

I don't know if my replies came through seems there was a mail delivery
issue. Yes the timing mark is the 3rd mark from the left and I will check
if a spring came off . It does not act like one has yet only one way to be
sure. I lubed all the weights and pivots and trigger cam with bosch dist
grease seemed like the best grease for the job. As I recall the springs
looked new and if they come off it would have to be on the adjustment post
end . I can see them through an opening in the advance plate so I will
look. If that's not the issue then for some reason perhaps when the dist is
hot something is binding.

 I may pull it so I can at least  mount the condenser so I can install
points in case the old pertronix fails . I had this issue with other dist
from the 72 in there yet it was pinging no springs were broken yet it
looked gritty inside perhaps binding the weights. These units are not that
involved so what ever is causing this hopefully will be an easy fix.

On Thu, Oct 10, 2019 at 1:44 PM Jim Adney <jadney at vwtype3.org> wrote:

> On 10 Oct 2019 at 11:12, William Jahn wrote:
>
> > I've adjusted the MPS and it does run better. Yesterday I decided to
> check
> > the timing. I lowered the RPM then checked it was 7.5 *BTDC it should be
> 5.
> > I backed it off to 5.
>
> On your late pulley, that is the 3rd timing mark from the left, correct?
>
> >  I can't tell what the issue is why the idle hangs and even when set @
> 7.5*
> > BTDC it didn't ping . I rebuilt this dist it had no wear and I lubed
> every
> > thing well and it worked fine. If it had a broken spring it would advance
> > far to much.
>
> The total amount of mech advance for a '73 is ~21 crankshaft degrees.
> That's a limit that's built into the shaft parts. If you had a broken
> spring, it
> would advance faster and get to the max advance at a lower rpm, but you
> would not get any more advance.
>
> In fact, if you had a broken spring, you might be working your way up the
> advance curve even at idle, so that there would be less than 21 additional
> degrees available.
>
> It might be worth looking inside your distributor to make sure that both
> springs are still there. It's unlikely that one has broken, as I've never
> seen
> that happen, but could one end have come off?
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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