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Old 10-31-2011, 02:06 PM   #1 (permalink)
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450SL odometer repair

I managed to get a 1980 dash pod from ebay to repair my non functional odometer. I thought I would be able to strip it down and swap the broken cog, but it looks like I will have to pull off the speedo needle to strip down any further. Has anyone taken a strip down any further?

The alternative is to swap over the entire module, which will lead to the incorrect mileage being shown which would cause a problem at the MOT. Since I have never clocked a car before, if I stick on an electric drill to take it up to 150,000 miles, am I likely to do any damage if winding at a relatively high speed?











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Old 10-31-2011, 02:21 PM   #2 (permalink)
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New replacement gears are available on the net for a very reasonable amount. Check Nobby's thread in the EGv107. I suspect that the expense of international shipping would be nominal, if you can't find them semi-locally. New gears will include the peace of mind of knowing that old ones may fail at any time.

Good Luck,
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Old 10-31-2011, 02:25 PM   #3 (permalink)
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Quote:
Originally Posted by RaceDiagnostics View Post
I managed to get a 1980 dash pod from ebay to repair my non functional odometer. I thought I would be able to strip it down and swap the broken cog, but it looks like I will have to pull off the speedo needle to strip down any further. Has anyone taken a strip down any further?

The alternative is to swap over the entire module, which will lead to the incorrect mileage being shown which would cause a problem at the MOT. Since I have never clocked a car before, if I stick on an electric drill to take it up to 150,000 miles, am I likely to do any damage if winding at a relatively high speed?











I have not done it....but I think you can take the odo apart (knock out the pin) and set the numbers to whatever. Take that with a grain of salt.
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Old 10-31-2011, 02:27 PM   #4 (permalink)
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Worth a call to MOT to see if there are some forms and procedures for replacing the unit. There probably are because this would be a common problem with older vehicles.
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Old 10-31-2011, 02:41 PM   #5 (permalink)
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I found out how to change the odo in nobby's thread without much further dissasembly, here http://www.benzworld.org/forums/w123...ml#post3884939
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Old 10-31-2011, 02:48 PM   #6 (permalink)
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I recall reading about replacing cogs on an odometer, but can't remember where! I was looking because I have a "clunking" trip meter on my 126 and it's still on my to do list. After 300,000 kms I'm not too worried about mileage inaccuracy. If I can find the post I'll come back. Meantime you have little to lose by pulling the broken one apart and taking nice pics for the rest of us! How's that for selfish advice! Good luck.
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Old 10-31-2011, 03:10 PM   #7 (permalink)
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Got it sorted!





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Old 10-31-2011, 05:04 PM   #8 (permalink)
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if odo & trip dont work, then its one of the two plastic gear/ worm drives.
If its just your trip then its 99% the small gear between the two cylinders that breaks a tooth when you reset the trip while the car is still moving

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Old 11-01-2011, 04:15 AM   #9 (permalink)
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Its both my odo and trip that have stopped, I'll pull the old pod out of the car tonight and post up the pictures.
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Old 11-01-2011, 02:20 PM   #10 (permalink)
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OK, I now discovered the root cause of the stopped odo and trip, the replacement dash has the same issue but to a lesser extent.

The problem is with a metal gear slipping on the main shaft. It is the large grey one at the end of the digits on the odo. It needs to be glued to the shaft.

I found a fix for it here Mercedes Benz 107 SL SLC Roadster Odometer Repair tricky to do but not impossible.

The good news is I will be able to fix both and resell one on ebay.
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