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  #1  
Old 06-09-2014, 08:59 AM
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Odometer stopped working 1981 300SD

I punched the odometer reset button and it went back to zero for trip miles. Then I noticed that the odometer is not registering mileage any more. The speedometer works fine; the mileage just does not change. So I am stuck on 259,000+ total miles and 0 trip miles.

Guessing that some gear has broken but I have not taken it out of the dash yet. Does anyone have a recommendation about what gear I should order - or what?

Thanks.

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  #2  
Old 06-09-2014, 09:04 AM
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I bet you car was moving when you pressed reset?
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  #4  
Old 06-09-2014, 10:11 AM
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I bought a special replacement gear for the VDO odometer, use the above links if you haven't already, great resources
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  #5  
Old 06-09-2014, 11:34 AM
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Quote:
Originally Posted by tyl604 View Post
I punched the odometer reset button and it went back to zero for trip miles. Then I noticed that the odometer is not registering mileage any more. The speedometer works fine; the mileage just does not change. So I am stuck on 259,000+ total miles and 0 trip miles.

Guessing that some gear has broken but I have not taken it out of the dash yet. Does anyone have a recommendation about what gear I should order - or what?

Thanks.
Does sound like you've got a broken gear. I recommend taking out your cluster and visually inspecting the gears. Order replacements from OdometerGears.com

I did my 82 300SD here:
W126 Odometer / Speedometer / Clock Repair - Imgur

Quote:
Originally Posted by dieselbenz1 View Post
I bet you car was moving when you pressed reset?
I've heard this advice for the mechanically driven speedometer cars but I think the electronic ones are OK to push the button on. I've never had an issue. More than likely OP has broken gear.

Quote:
Originally Posted by Tanksowner View Post
I bought a special replacement gear for the VDO odometer, use the above links if you haven't already, great resources
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  #6  
Old 06-09-2014, 05:19 PM
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I fixed both of mine using odometergears.com. Very helpful guys. Gear teeth number is important. Old eyes make it hard to count teeth. Used felt-tip pen marking first gear counted. Lots of light. Got it right the second time. They aren't exaggerating in respect to blowing things out with air. Get the set of 3 gears. You will need at least 2.
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  #7  
Old 06-09-2014, 06:13 PM
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Great advice. No, the car was not moving when I reset the odometer and it stopped working.

Thanks for the help.

Anyone remember the post that tells how to bend a coathanger to remove the entire instrument section? Saw it years ago. Never had the guts to remove the entire instrument section but believe it just pushes in and is held by friction and perhaps a rubber gasket.
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  #8  
Old 06-09-2014, 08:32 PM
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1977 300D NA
 
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Quote:
Originally Posted by tyl604 View Post
Great advice. No, the car was not moving when I reset the odometer and it stopped working.

Thanks for the help.

Anyone remember the post that tells how to bend a coathanger to remove the entire instrument section? Saw it years ago. Never had the guts to remove the entire instrument section but believe it just pushes in and is held by friction and perhaps a rubber gasket.
I remove the two bottom panels under the dash, reach up and push the instrument cluster out. Plus by doing it that way you do not risk scratching your dash or the cluster.
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  #9  
Old 06-09-2014, 10:57 PM
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Well, have not heard of that method but it makes sense. Thought the indies just pulled it out with a bent wire like a coathanger, maybe somewhat stronger.

Thanks for the info.

Is there a single mechanism that runs the odometer and the trip meter or are there two separate gizmos?
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  #10  
Old 06-11-2014, 06:30 AM
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Same gizmo runs odometer and trip meter. I never got around to replacing the gears on my 83 300sd before I crashed it. Now my 86 300sdl needs the gear set. A soon as I get my radiator issue dealt with I am going to order the gears.
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  #11  
Old 06-11-2014, 08:46 AM
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Guys, thanks for the advice.

JamesDean - looked at the pics you sent. Is there any text here or only pictures? If no text, do the plastic gears just prize off the spindle or how do you get them off? Maybe they are reverse threaded? Assume when I pull the cluster out of the dash I will recognize the parts or do I have to take off a cover to see the gears?

Thx
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  #12  
Old 06-11-2014, 09:13 AM
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I will confirm the easiest method (for me anyway) to remove the cluster is to push from underneath. If its never been done, you'll have to thread your way around the sound deadening mat, but its easy enough. Using the hangers method scratches your dash and cluster assembly, although going that route might be easier if you lack the flexibility to snake your hand into the dash while kind of halfway laying on the ground/roll pan.

In my odo case, I did not have a broken gear, but rather one of the pressed-on pot metal gears came loose on its axle. It was pressed on and simply held up by friction, and eventually wore enough internally to allow it to spin freely thereby killing the odo. I recall this failure mentioned in one of the diy threads. A little dab of stupid glue on both sides to "lock" it back on the shaft, let dry, reassemble.

It is a single gearset that turn both the trip and main odo. If the potmetal bit is freewheeling, it will kill both. If the main odo works but the trip doesnt, its a stripped plastic gear between the two.
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  #13  
Old 06-11-2014, 11:04 AM
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I'll soon be doing this on my 240D as well. I seem to recall seeing advice to replace the light bulbs in there at the same time. IIRC, there are some brighter bulbs available that can make your life better at night.
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  #14  
Old 06-11-2014, 05:04 PM
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Thanks for the info. I would also like to know if there are slightly brighter bulbs that I can install while I am in there.
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  #15  
Old 06-11-2014, 06:03 PM
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If you can figure out how many teeth you have.

How to repair your odometer for pocket change

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