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  #1  
Old 11-18-2010, 10:11 AM
Tom Evans
 
Join Date: Jan 2007
Posts: 180
Setting Correct Odometer Mileage

I have a dead 126 electronic odometer and a good used odometer. I want to set the mileage on the used odometer to read the same as the dead odometer. I did a search and didn't find any thread that describes how to set the mileage on this type of odometer.

Does anyone know of a thread/web link with this information?

Thanks.

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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)
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  #2  
Old 11-18-2010, 11:12 AM
One step at a time
 
Join Date: Sep 2009
Location: Burleson, TX
Posts: 426
Having replaced my odometer gears (all three) recently I can tell you it can be done.

Once the plastic "cover" is off the gears you can spin the drive gear (the one by itself) with your finger. This will take forever depending on how many miles you need to add/remove. I would think that a variable speed dremel on a low setting used with a felt buffer tip could acomplish the task quicker.

I wouldn't want to go too fast with it.

Also, since you have the odometer apart, why not go ahead and replace all the gears, it's only ~$60 for the set.

www.odometergears.com
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1985 300SD 322,000
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  #3  
Old 11-18-2010, 11:23 AM
Tom Evans
 
Join Date: Jan 2007
Posts: 180
I have actually replaced the first large gear a few weeks ago with another used gear (I actually have two used speedometer heads from gas models). I haven't pulled the cluster yet to see if the same gear has broken again.

What I am concerned about is whether there is something binding in the odometer which is causing the gear to break.

One more thing. Before the odometer stopped yesterday morning, it was reading about 10%-20% too low. I think it has been reading low since I replaced the large gear, but don't know for sure. I didn't count teeth on the replacement gear, but I believe all models use the same gear in this application. Is that true?
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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)
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  #4  
Old 11-18-2010, 11:27 AM
Tom Evans
 
Join Date: Jan 2007
Posts: 180
One more comment on correcting the mileage. I was looking for a method to go in and manually set the individual numbers. I'm at 272K on this car and most of the donor cars are around 150K. That's a lot of Dremel tool time!
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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)
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  #5  
Old 11-18-2010, 11:32 AM
Biodiesel300TD's Avatar
|3iodiesel300T|)
 
Join Date: Dec 2004
Location: Albany, OR
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You should replace all three gears. There's three if I remember correctly. When you put in a good one they tend to tear up the worn out ones. Since they are plastic they get brittle and the teeth brake off. I'd attempt replacing all the gears. Go to odometergears.com and he'll get you set up.
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  #6  
Old 11-18-2010, 11:33 AM
compu_85's Avatar
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One note: According to law what you should do is zero out the new odometer and place a sticker on the door jam saying the odometer was replaced at x miles. I've never head of this happening, but if you get busted the fines are quite large.

-Jason
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  #7  
Old 11-18-2010, 12:35 PM
One step at a time
 
Join Date: Sep 2009
Location: Burleson, TX
Posts: 426
Quote:
Originally Posted by Tom Evans View Post
I have actually replaced the first large gear a few weeks ago with another used gear (I actually have two used speedometer heads from gas models). I haven't pulled the cluster yet to see if the same gear has broken again.

What I am concerned about is whether there is something binding in the odometer which is causing the gear to break.

One more thing. Before the odometer stopped yesterday morning, it was reading about 10%-20% too low. I think it has been reading low since I replaced the large gear, but don't know for sure. I didn't count teeth on the replacement gear, but I believe all models use the same gear in this application. Is that true?

There were about 6 diffrent gears to choose from when I ordered mine. I assume it has to do with diffrent trannys and rear end gearing. As far as manually changing the odometer reading, that would require a complete disection, of which I have no experience with.
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  #8  
Old 11-18-2010, 01:48 PM
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|3iodiesel300T|)
 
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Location: Albany, OR
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Quote:
Originally Posted by 4thesporty View Post
There were about 6 diffrent gears to choose from when I ordered mine. I assume it has to do with diffrent trannys and rear end gearing. As far as manually changing the odometer reading, that would require a complete disection, of which I have no experience with.
There are three that are easy to get to on the side of the odometer that are under a cover. It's really easy to swap these out, and these are usually the ones that need to be replaced. Here is a pic of what I'm talking about it came from here - http://www.odometergears.com/mercedes.html
The gears a labed E1, E2, and E3 in the pic

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  #9  
Old 11-18-2010, 02:21 PM
One step at a time
 
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Location: Burleson, TX
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What I mean is there are actually 8 diffrent E3 gears to choose from. Plus E1 and E2. E3 ranges from 12-19 teeth. I assume this is based on trannys and rear ends to get the correct mileage applied.

If you have a gear with the wrong amount of teeth, then you could have a slow odometer. For instance, If you took a broken odometer from an 85Sd and replaced it with a working odometer from an 84SD it should be diffrent, as the rear end gearing in an 85 is taller than an 84. Therefore, of those two instrument clusters the E3 gear would be diffrent and have a diffrent amount of teeth.
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  #10  
Old 11-18-2010, 02:48 PM
Tom Evans
 
Join Date: Jan 2007
Posts: 180
Is the E3 gear the one that actually turns the numbered dials? Or does E3 connect with the another gear which is connected directly to the numbered dials?
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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)
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  #11  
Old 11-18-2010, 03:31 PM
Registered User
 
Join Date: Dec 2006
Location: Eastern Mass
Posts: 231
I replaced mine with a junk yard part. I was able to roll the new one forward to match the mileage. I applied some force to each wheel and they did roll with some resistance. It doesn't appear to have damaged it. That was approx 50K ago and it is still working well.
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  #12  
Old 11-18-2010, 05:02 PM
One step at a time
 
Join Date: Sep 2009
Location: Burleson, TX
Posts: 426
Quote:
Originally Posted by Tom Evans View Post
Is the E3 gear the one that actually turns the numbered dials? Or does E3 connect with the another gear which is connected directly to the numbered dials?

I can't remember for sure, E3 either turns both numbered dials, or E3 is a "double" gear, meaning it has two gears cast as one unit and the backside turns the numbered dials.

If you have a junk cluster, I would recommend taking it apart to get a clearer picture. Just take a couple of pics/notes before you disassemble. I can have it from installed in car to disassembled on my table in less than 10 minutes now.
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1985 300SD 322,000
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  #13  
Old 11-18-2010, 10:22 PM
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My W124's trip odometer doesn't reset to zero. At some point I will attempt to remove and disassemble it to see what is causing the numbers to just dance around when I try to reset.
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  #14  
Old 11-18-2010, 10:26 PM
Registered User
 
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Location: Middle TN
Posts: 4,154
I got lucky and found some gears in a gasser. I'm too cheap to buy from gears.com when I find places selling similar gears for ~$3 each. Of course, it will require some effort to determine the correct specs. That's why gears.com can charge more. He has done the research, Knowledge is like sex. You can't charge for it once you've given it away.
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  #15  
Old 11-18-2010, 11:00 PM
One step at a time
 
Join Date: Sep 2009
Location: Burleson, TX
Posts: 426
Quote:
Originally Posted by Renntag View Post
My W124's trip odometer doesn't reset to zero. At some point I will attempt to remove and disassemble it to see what is causing the numbers to just dance around when I try to reset.

Well, in my 126 the push button acts on a metal arm that pushes against a spring, and the number magically return to zeros.

Perhaps the amount of travel of the metal arm is not enough?

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1985 300SD 322,000
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