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  #1  
Old 11-19-2013, 05:11 PM
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Location: Pittsburgh PA
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Speedometer not working

ive been perusing the forum for speedometer repairs, i have not found any.
my speedometer is not working at all. is it typical for the cable or the speedometer itself to fail in these cars.
i have a 1982 300d turbo diesel
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  #2  
Old 11-19-2013, 05:24 PM
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1979 & 1985 300D's
 
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Location: Tucson, AZ
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If your speedo is sitting at 0 no matter how fast you're driving, it's probably the cable. It's not a very expensive part at takes about 15 minutes to replace.
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1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino

http://i.imgur.com/LslW733.jpg

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  #3  
Old 11-19-2013, 06:10 PM
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its actually always at 20. is that different. even if engine is off
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  #4  
Old 11-19-2013, 06:25 PM
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1979 & 1985 300D's
 
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Location: Tucson, AZ
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Not sure on that. Doesn't seem likely to be the speedo cable if that's the case.

A friend's car, the white one in my signature, has the same problem. We are going to tear in to his speedometer soon to see if we can figure out what's wrong.

There is a spring that returns the speedo to 0 when the cable stops turning. Our first guess is that perhaps this spring is broken/stuck.
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1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino

http://i.imgur.com/LslW733.jpg

The Baja Arizona Oil Burners Send a message if you'd like to join the fun
Left to Right - UberWasser, Iridium, Stuttgart-->Seattle,, mannys9130

Visit the W123 page on iFixit for over 70 helpful DIY guides!
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  #5  
Old 11-19-2013, 08:49 PM
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Does the odometer work? If so then it is not the cable. If nothing works then I would guess it is the cable.

If the spedo works and the odo does not, then it would be the Pot Metal Gear slipping on the shaft.

http://www.peachparts.com/shopforum/diesel-discussion/200668-dont-drop-your-speedometer.html



Here is the Diesel Giant DIY

How to Repair Your Broken Odometer

Charlie.
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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

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Last edited by charmalu; 11-19-2013 at 09:03 PM.
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  #6  
Old 11-21-2013, 09:44 PM
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Location: Pittsburgh PA
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to late im an idiot and ordered a new speedo cable.
took it all apart and cleaned it..guess what...speedo works now..


i did rebuild the reostat while it was out also..
weee.
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  #7  
Old 11-21-2013, 10:29 PM
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1979 & 1985 300D's
 
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Glad to hear that. We'll try that with our buddy's car.
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1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino

http://i.imgur.com/LslW733.jpg

The Baja Arizona Oil Burners Send a message if you'd like to join the fun
Left to Right - UberWasser, Iridium, Stuttgart-->Seattle,, mannys9130

Visit the W123 page on iFixit for over 70 helpful DIY guides!
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