[T3] Recalibrate speedometer

[Jacob Adam Schroeder]

On Thu, May 7, 2015 at 10:40 AM, Jim Adney <jadney at vwtype3.org> wrote:

>
> There are a couple of possibilities. If the pointer is just offset on
> the shaft, then it can be turned. That could be the case IF the
> angular offset is always the same, which would be almost the same as
> being off by 10 mi/hr at all speeds.
>
>
I believe this is the case, but I will confirm on my drive home.



> If someone has taken the speedo apart and simply put it back together
> wrong, that's probably what happened. I could fix that for you if
> that's the problem.
>
> Otherwise, recalibration requires special equipment that changes the
> strength of a magnet inside. I don't have that equipment. In general,
> I have found that taking the speedo apart does not change the
> strength of the magnet or the calibration.
>
> I don't recommend this as a DIY project for most people. There are
> too many ways for it to get screwed up. I've made tools and fixtures
> that you won't have that let me do this work without damaging other
> parts.
>
> At the same time, I could do the standard repair that I usually do on
> the late speedos that have the trip odo. That repair costs $50 plus
> return shipping. If your odo is still okay, this would be
> preventitive. Repositioning the pointer at the same time could be
> done at no extra charge as long as you spelled out exactly what the
> problem was when you sent it to me.
>
>
Thanks, Jim.  I'll do some further investigation to see if I can precisely
identify the problem.  My odometer seems to work OK and only deviates
slightly from my GPS, but not enough to be concerned about.
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