Speedometer not working

Tiny
TRUSINNA
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  • VOLKSWAGEN
95 VW Jetta GLS, 140000. Neither the speedometer or tachometer work. The tachometer needle shakes constantly but will not move from 0. The speedometer won't even do this much. What could cause this and how do I fix it?
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Sunday, August 20th, 2006 AT 4:21 PM

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Tiny
MIKEYBDMAN
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Your instrument cluster has a check mode that will fault what is the problem. Problem is it calls for a Special test box and adapter. Might have to take it to a shop that specializes in VW's.
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Sunday, August 20th, 2006 AT 4:34 PM
Tiny
FRIEDEMANN
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THERE ARE NO PARTS TO BUY. This is a non repairable item.

How many have I fixed now? 5? The Speedo.
A drivegear splits and falls off the shaft. This gear drive the odometer. The only way to fix that is to either pick up a new speedo, a autowrecker speedo or repair the one you got.

If you are gonna repair it, you have to disconnect the speedo cable and take off the front parts that howd in the speedometer. You are gonna take it to the kitchen table to do the rest of the work. Once on the table you have to get behind the black face plate for that is where the problem is. The speedo needle just pulls off. You must then take off the 2 small black screws to take off the front face. The white gear is either in 2 pieces floating around inside there or still may be on the shaft but spins on the shaft instead of being tight on the shaft.
Hope you have a steady hand and a patience for fixing clocks, cause this is what kind of job this is. You are going to have to epoxy the broken gear back on the shaft in the place where it belongs without having excess glue mess up the teeth spacing for it has to mesh with the drive gear. Once you get that(you may be using a fingernail file alot) glued and dried you can test if it works by hand turning the speedo drive until it has meshed all the teeth without a hitch.
If the gear has not split in 2, so much the better, just epoxy it on the shaft.
That fixes the odometer. The speedo needle itself is a friction fit on the pin that sticks out. Putting it in the right place on the pin is gonna take some "comparison driving" >temporarily installing the speedo and driving along side somebody and comparing speeds at a designated low speed. This may take a couple of adjustments(disassemble/reassemble the speedo till you get it right)
If the speedo doesn't move at all then that thing is hooped. Find another unit, but I have seen it where the needle lays on the bottom of the face inside the speedometer. Once you got all that together and desk tested to be sure everything works. I stick a pencil in a reversible drill and stick the other end in the speedo and activate the dril to make sure I am first going in the right direction. Noted by the speed needle movement l will run it for a full rotation of 1 kilometer watching the 10ths carefully to be sure there is no catching of the gear teeth.
Once done, it is done. Mine has been good ever since ( 3 years later). I know more of what I can do. It is time consuming.
But it was considered unrepairable, ( but you fixed it.)

The tach. Is the same as the speedo. The indicating needle slides on a pin. Sure the RPM's won't be exact, but it is all relative anyways. You just know that the car runs good at this particular speed and rpm as it is indicated to you. It is not like you are matching it up to something. All you know is if the car is not running it is 0, if it is running, it is higher than 0
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Monday, December 11th, 2006 AT 10:10 PM

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