Date: Mon, 29 Jul 2002 13:12:39 -0400
Reply-To: Jay L Snyder <Jay.L.Snyder@USA.DUPONT.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jay L Snyder <Jay.L.Snyder@USA.DUPONT.COM>
Subject: Speedometer Calibration
Content-Type: text/plain; charset=us-ascii
I repaired my '89 Jetta odometer a few months back (and more recently, an
'87 Vanagon odometer) using a new gear purchased from Palo Alto
Speedometer. The only problem I had with the repair was determining at
what position to place the speedometer needle back on the shaft. If you
just stick it on the peg with the clock spring fully relaxed, it will read
fast, as much as 8 or 10 mph. When I did my Jetta, I pre-loaded the spring
slightly (I guessed about 10 mph) and sure enough, it read 10 mph slow!
Yesterday I finally got around to pulling out the speedometer ( a bit more
work on the Jetta than the Vanagon) and tried to figure out a reliable
method for placing the needle back on the shaft. It appears there is a
zero slash mark below the 10 mph "peg" that you can't see once the
speedometer is in place. On the clock spring collar there is a line that
needs to be straight up (12 o'clock) while you are putting on the needle.
If you put the needle on to point to the zero slash mark, you can then lift
the needle past the 10 mph "peg". This will pre-load the sping a little and
should get you pretty close. My Jetta's speedometer is back to stock
specs, which means it reads about 3 mph fast at 60 mph. I could probably
get it right on (better then stock) if I really wanted to. I want to check
it a few more times with the interstate mileage markers.
I would be interested in hearing from anyone else who has had experience
with this needle problem. I didn't notice this zero slash mark before on
the Vanagon speedometer, but I am sure it is there. They are similar VDO
units and the replacement gear is the same.
Jay
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