speedo musings

[rhock99 at epix.net (Ryan H)]

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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