Odometer Not working - Question and Picture - Mercedes-Benz Forum
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#1 (permalink) Old 01-16-2010, 08:33 AM
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Odometer Not working - Question and Picture

When it rains, it pours!!

Odometer quit after i pressed reset on the trip counter, i am genius i know

I just took it apart to find that a cog (in the picture) was pushed out of place...

I pushed it back into place and all seems good ..

Do i need to do anything else? how can i be sure that the trip meter and the mileage meter are aligned correctly?



And here is the cog...



Do i need to do anything else while i am in there? i am changing the main lighting bulbs since they seem to be original. I am also thinking about spraying some contact cleaner inside the rheostat/dimmer while i am in there....

I do have some white mold spots inside the surround...any ideas about cleaning? or is not worth the hassle?

Thanks, would appreciate a quick response since i need to put it back together today !

Edit: that green cog if for the mileage, is there supposed to be another one in there for the trip? i can't figure out how they are both connected...

thanks
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#2 (permalink) Old 01-16-2010, 08:55 AM
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you would see how the odo and trip would be connected if you took the faceplate off. it's pretty simple how they designed it, but they tried to make it VERY hard to roll the odometer forwards or backwards.

if you want to know how it looks in there, find an odo from the junkyard and experiment.



and did you hit the trip reset with the car in motion?

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#3 (permalink) Old 01-16-2010, 08:58 AM
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you would see how the odo and trip would be connected if you took the faceplate off. it's pretty simple how they designed it, but they tried to make it VERY hard to roll the odometer forwards or backwards.

if you want to know how it looks in there, find an odo from the junkyard and experiment.



and did you hit the trip reset with the car in motion?
yes, no one gave me the memo about not doing that...

My question right now is do i need to do anything else? or are we good for now?

thanks for the response
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#4 (permalink) Old 01-16-2010, 09:02 AM
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yes, no one gave me the memo about not doing that...

My question right now is do i need to do anything else? or are we good for now?

thanks for the response
yeah, happened to me a couple times in my old w126.

replace the bulbs and you should be good to go. you could take a small brush (like a toothbrush) and clean up the contact corrosion a little, but i doubt that would really help anything out. so you SHOULD be good for now. im sure a couple others will chime in here about what you could do.

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#5 (permalink) Old 01-16-2010, 09:05 AM
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yeah, happened to me a couple times in my old w126.

replace the bulbs and you should be good to go. you could take a small brush (like a toothbrush) and clean up the contact corrosion a little, but i doubt that would really help anything out. so you SHOULD be good for now. im sure a couple others will chime in here about what you could do.
What about the alignment of the trip and mileage, should i worry about that ?

for a 17 year old car, i am quite impressed with the plastic quality..no broken tabs or anything.. when i touch any plastic on my 2000 dodge, it crumbles in my hand....

what about the rheostat? spray it with contact cleaner?

thanks
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#6 (permalink) Old 01-16-2010, 09:15 AM
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What about the alignment of the trip and mileage, should i worry about that ?

for a 17 year old car, i am quite impressed with the plastic quality..no broken tabs or anything.. when i touch any plastic on my 2000 dodge, it crumbles in my hand....

what about the rheostat? spray it with contact cleaner?

thanks
if only that green gear popped out of place you should be fine. the gears are all rather firmly held together by all the gears on the other side of the assembly. i honestly don't know about the rheostat. i've never had to mess with the rheostat before as it works fine on my car. i just have about 8 of them around as spares.

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#7 (permalink) Old 01-16-2010, 01:19 PM
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Thank you sir for the helpful responses I truly appreciate it....
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#8 (permalink) Old 01-16-2010, 03:58 PM
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The gear will pop off again at some point. It may be tomorrow or in 6 months. This is a neat feature of the VDO speedometers used in European cars like MBZ and Porsche. Basically the moving parts of the odometer start to bind up with age and the increased drag causes that gear to walk off the shaft. Sometimes the gear cracks. I've dealt with this hassle on 2 of my 88s by buying new speedo asemblys from MBZ at $300 apiece. The new part will be set to the old mileage. I've heard that speedo shops can repair this problem but I haven't tried that myself.
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#9 (permalink) Old 01-16-2010, 07:41 PM
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The gear will pop off again at some point. It may be tomorrow or in 6 months. This is a neat feature of the VDO speedometers used in European cars like MBZ and Porsche. Basically the moving parts of the odometer start to bind up with age and the increased drag causes that gear to walk off the shaft. Sometimes the gear cracks. I've dealt with this hassle on 2 of my 88s by buying new speedo asemblys from MBZ at $300 apiece. The new part will be set to the old mileage. I've heard that speedo shops can repair this problem but I haven't tried that myself.
It was kinda of my fault this time, because i keep on pressing the trip reset repeatedly while the car is moving,its a bad habit i have ..... I learned my lesson, and i am not touching it again
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#10 (permalink) Old 01-16-2010, 07:54 PM
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Take it from somebody that delves into vintage electronics....don't risk spraying contact cleaner on those rheostat parts, If you are unlucky and let's face it, your car hates you, you could dislove the plastic parts. A safer alternative is DeoxIT D5, work it, let it dry and follow up with DeoxIT Gold GN5, work it and then let dry.....good to go. They come in a small kit @Radio Shack...not cheap.

Any gears you slip back on should at least have a drop of super glue on the cleaned shaft-cheap insurance. But like augapfel said, if the gear is split, you need to find a fresher one.

Kevin
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