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126 Speedometer repair
I removed the cluster from my 89 300SE because the speedometer stopped working. History is when I bought the car a year ago it wasn't working. Started at some point and ran well until a week ago. Based on some of the feedback I removed the cluster and right now I am looking at the back of the unit & want to be careful before I proceed. How do I delve further into checking the gears of the speedo?
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#2
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This is probably the best write up on the speedometer/odometer HERE
TIP: Draw a sketch of your cluster on a piece of paper. As you remove screws place them on your sketch so you know which hole they came from. The screws vary in length and it can get confusing on re-assembly
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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif 15 VW Passat TDI 00 E420 98 E300 DT 97 E420 Donor Car - NEED PARTS? PM ME! 97 S500 97 E300D 86 Holden Jackaroo Turbo D 86 300SDL (o\|/o) Last edited by TX76513; 04-24-2009 at 10:34 AM. |
#3
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great pce but that is for cable drive,the 126 is electronic and is always about plastic gears that have petrified[chemically changed to a very soft state]speedometer.com will have the gears although you will need a good set of eyes for the identification process.
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg |
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Your are correct David - should have mentioned that. DG pics gave me enough forsight to know what I was getting into.
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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif 15 VW Passat TDI 00 E420 98 E300 DT 97 E420 Donor Car - NEED PARTS? PM ME! 97 S500 97 E300D 86 Holden Jackaroo Turbo D 86 300SDL (o\|/o) |
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Should I still remove & inspect gears?
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#6
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Yes, sometimes it's just the contact plug is corroded - if you don't find any gear damage PM me pretty sure I have a few electronic modules for a 126 boxed up. Good time to paint needles and replace bulbs and such.
TIP: Make up some numbered tape tags so when you are unplugging idiot lights to remove cluster you know what order they go back.
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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif 15 VW Passat TDI 00 E420 98 E300 DT 97 E420 Donor Car - NEED PARTS? PM ME! 97 S500 97 E300D 86 Holden Jackaroo Turbo D 86 300SDL (o\|/o) |
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I removed & inspected. The gears that I did see - I rotated and they were for the odometer which works fine. I didn't see too much else in there. I didn't remove the other 2 screws that appear to release the speedometer from the rest on the workings. What internal issues should I be looking for? All connections seem to be clean and bright.
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#8
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It could be something easy like loss of power (pulse). These are analog electronic speedo's Does your cruise control work? Follow your cabling to make sure the sending unit didn't pop off the trans. MB Neo what state are you located in?
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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif 15 VW Passat TDI 00 E420 98 E300 DT 97 E420 Donor Car - NEED PARTS? PM ME! 97 S500 97 E300D 86 Holden Jackaroo Turbo D 86 300SDL (o\|/o) |
#9
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I'll check the wire. Not sure what to look for yet, but once I get underneath I'm sure it will be obvious.
Cruise if full operational New Jersey |
#10
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if the speedometer itself stopped working then the most likely culprit is the pickup located on the left side of trans at rear.
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg |
#11
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#12
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How do I check the pickup, or does it need to be replaced?
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