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  #1  
Old 01-18-2005, 02:34 PM
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How to spin odometer with drill to see if fixed?Any "SWISS WATCH" techs?

How do I spin a repaired odometer with a electric drill to see if its fixed?

Furthermore can the odometer be removed from the speedo unit separately? I would like to work closer "in".
Anybody got any swiss watch hands experience to give advise?

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  #2  
Old 01-18-2005, 02:39 PM
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Perhaps the easiest way would be to get a cable from a parts yard and attach it to the speedo....and use a drill at the transmission end to spin it.
Otherwise you need to know the size and shape of the cable end and replicate that with a drill to power it....
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  #3  
Old 01-18-2005, 03:01 PM
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Carrow,
If you can pull down a MB manual transmission, I'm pretty sure you can figure out how to take the speedo out of the cluster; it's apparent how it comes apart once you get the cluster out on the workbench and can see the back of it.

Quote:
you need to know the size and shape of the cable end and replicate that with a drill to power it....
I think I used a 10p nail with flats filed onto the pointy end so that it would fit into the speedo. I nipped off the nail head and chucked the rig into the drill, poked it into the speedo and Zoom, Zoom, Zoom!

My Makita cordless drill goes about 28mph.
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  #4  
Old 01-18-2005, 03:05 PM
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actually (and the smaller the drill the better) you can chuck up something "soft" like a small hardwood dowel(yes, I know) and put a taper on it with a file or fine rasp while it turns. Then push it into speedometer socket and run. The wood will strip or fray before you damage the metal. A short piece of hard plastic tubing will work too.
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  #5  
Old 01-18-2005, 03:32 PM
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I meant CCW or CW----what drill direction...

A manual transmission is a lot easier to fix than a speedo, man those parts are microscopic. Also one slip and you have a pile of DNA sized plastic gibberish all over the place.
( The later Benz's have plastic gears and not metal ones.) They wanted $395 for a new one and $195 used, thats when i said, I better learn how to do this, so I did, now I want to test it before I put it back in.
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  #6  
Old 01-18-2005, 03:53 PM
BusyBenz
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Didn't Ford, or GM, or Chrysler have a trap built in to their odometers for crooked and dishonest used car dealers that would run back mileage?

Be careful that MB didn't incorporate similar traps!

Of course I'm not suggesting that you would be, or are, doing anything dishonest, just adding caution if they did have a trap! BB
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  #7  
Old 01-18-2005, 03:58 PM
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I used a wooden match stick in a drill to test mine. If you look at the gears you can tell which way to turn it. I can only guess now as it has been a couple months since I had one apart but I think it was clockwise.

http://www.peachparts.com/shopforum/showthread.php?t=90607&highlight=odometer
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  #8  
Old 01-18-2005, 04:09 PM
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If you look at which way the needle must move, it will give you a clue as to the direction it must turn from the back, CCW. I'm not sure I would risk breaking a small piece of wood off in the end of the drive. If you can turn it by hand with the proper size nail, your drill motor shouldn't hurt it. (I use a small piece of speedo cable left over from some Halda mods from years ago.)

Wes
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  #9  
Old 01-18-2005, 04:16 PM
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The speedo cables have to be able to go forward or backward because they are geared to the driveshaft output. The car can certainly go in reverse (unless it's a Tucker! ) try it both ways, one will register forward speed. You need to check it both ways anyway, in case it stopped working first time you backed up! The "traps" for speedo reversal that I've heard of consisted of probes that put a scratch mark along the most significant digit of the speedometer, usually the 10,000 digit. If a "8" was exposed, 0-7 were already scored, so if it was wound back to a "6", a big score line would show through the "6" indicating it had been tampered with.
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  #10  
Old 01-18-2005, 08:39 PM
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Quote:
Originally Posted by BusyBenz
Of course I'm not suggesting that you would be, or are, doing anything dishonest, just adding caution if they did have a trap! BB
It wouldn't suprise me to discover guys with old MB diesels rolling their odometers forward.

For "bragging rights"...

- Patrick
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  #11  
Old 01-18-2005, 11:39 PM
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The speedo is cake, like repairing a truck engine. Of course, this is what I also work on/repair/customize:





Here's the latest custom I've built (Bill Yao MKII Mil dial, ETA Swiss 25 Jewel Gold Plated movement, Mercedes white lume hands, SST case with saphire crystal and view back, Seiko Military band - wholesale $340):







The speedo is easily removed from the cluster, but you have to unscrew the oil press/temp pod first. Remember to fix the Odo while it's out. Just pull the rod out far enough to pinch it with some dikes then press it back on, will never spin again (don't lose the brass press ring when you press the shaft out.)
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Last edited by TomJ; 01-19-2005 at 01:46 AM.
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  #12  
Old 01-18-2005, 11:45 PM
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I tested an older speedo that I had laying around (from a 107 I think) a few weeks ago. I looked around for one of those square bits (the kind you use in screws that have the square "slot" in them) I forget their name...all I can remember is that it was invented by a Canadian fellow. Anyway... if you have any of those odd looking bits, one will fit into the square hole, and then you can use a drill (slowly) to see if it works, or where it quit working.
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  #13  
Old 01-19-2005, 12:33 AM
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Hm... same hands as on my Citizen watch, except my second hand is red. Fixing or building watches would give me an ulcer.
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  #14  
Old 01-19-2005, 01:44 AM
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Quote:
Originally Posted by dabenz
Hm... same hands as on my Citizen watch, except my second hand is red. Fixing or building watches would give me an ulcer.
Yeah, but there's some pretty good ulcer meds out there now. I know.
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1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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"If you don't know where you are going, any road will get you there". Lewis Carrol
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  #15  
Old 01-19-2005, 08:31 AM
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Boy this is sure the best forum on the Internet

Boy this is sure the best forum on the Internet!

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