speedo musings

[jlagnese at massed.net (John Lagnese)]

I did put graphite in the speedo mechanism. I now have several black numbers
on the odometer.
----- Original Message -----
From: "Ryan H" <rhock99@epix.net>
To: "John Lagnese" <jlagnese@massed.net>
Cc: <scirocco-l@scirocco.org>
Sent: Sunday, December 21, 2003 4:23 PM
Subject: Re: speedo musings


John, I think it's all related to the same cause: the metal square inside
the speedo cable rubbing harshly against where it meets cluster.  In my
case, a little lube stopped it.  Seems in your case, the cable was placing
it at an angle that resulted in the noise.

>
> From: John Lagnese <jlagnese@massed.net>
> Date: 2003/12/21 Sun PM 02:45:36 EST
> To: Michael Abatzis <abatzis2@hotmail.com>
> CC: scirocco-l@scirocco.org
> Subject: Re: speedo musings
>
> I had the same loud noises from the speedo when cold. I tried to lube
> the speedo and changed the cable to no avail. The only help was to move
> the cable when it was making noise. I changed the oxs counter in an
> unrelated fix and lo and behold, noises were gone! Coincidence, maybe,
> but I don't think so.
> John
> 87 16V
>
> Michael Abatzis wrote:
>
> > note: original post broken up. see subject "my car is fast again" for
> > more exciting speedometer related insights!
> >
> > 1) anyone know how to calibrate a speedo? the mechanism's interesting,
> > for those who've never seen it. there is no direct connection, through
> > gears or otherwise, between the speedo cable and the needle. the cable
> > runs into a metal disk, which spins within, and doesn't actually
> > touch, a (magnetized, i assume) metal cup. the cup is connected to the
> > needle, and the whole thing is preloaded with a small coil leaf spring
> > (like the kind in a thermostat). calibration is (i think) achieved by
> > turning the needle itself, which should affect the amount of preload
> > on the metal cup. this seems like it would be extrordinarily difficult
> > to calibrate, but hopefully it's something easy like "adjust it so the
> > needle JUST returns to the stop when moved". otherwise you'd need to
> > do something like "at this rpm, speed should be x mph". install
> > speedo, compare, take speedo out, move needle, repeat until you get it
> > right. this would be a colossal PITA.
> > 2) the motometer and vdo units are very different. the vdo is much
> > lighter, and harder to dissassemble. i couldn't figure out how to get
> > it completely apart. the motometer was easy. the gearing systems for
> > the odometer also looked different, more than just the difference
> > between plastic and metal gears (the motometer has some plastic gears
> > in the mechanism also, btw, although these apparently don't break much).
> >
> > my car is fast! woo woo! as a side note, that screeching when the
> > speedo is cold is now gone. i don't know what the hell that was.
> >
> > -Michael Abatzis
> > New Orleans!
> > 1988 Scirocco 2L 16v RIP
> > 1987 Scirocco 2L 16v...
> >
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