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#1
05-30-2007, 10:16 AM
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slipping odo in 126, easy fix?
is that just a matter of repositioning the gears and some crazy glue? or is it more like replacing wheels?
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#2
05-30-2007, 10:24 AM
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The W126 speedos usually require a gear replacement.
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#3
05-30-2007, 10:34 AM
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Henry are you going to autopsy? Mine went south last month I just threw another in until either I quit procrastinating about fixing it or someone else did an electronic speedo.
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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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#4
05-30-2007, 12:12 PM
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Sam 84 300SD 350K+ miles ( Blue Belle )
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#5
05-30-2007, 12:23 PM
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If it is just the gear slipping on the shaft like the mechanical speedos do, I remove the gear and lightly "stake" the shaft with a punch and reinstall the gear.
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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.
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#6
05-30-2007, 12:36 PM
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W126 speedos are different.....
The W126 speedo is an electric speedo head and as such the odometer drive is configured differently from the cable driven units.
On my older MBs, I could broach some splines on the shaft after disassembly and the gear would get a new purchase on the shaft and this keeps it from slipping. I used a pair of pliers to slightly roughen the shaft, and I like this better than trying to use some glue in very tight quarters. For the W126, there is a motor driven gearset that seems to have fragile gears. The gearset is easily accessable after speedo removal, just remove the metal cup the speedo is in and then a side plate external to the speedo frame, and the gears are revealed. I've disassembled quite a few speedo heads to gather a good set of gears, but replacements are available online, if you search a bit. I recall there's a company in Virginia, maybe Newport News or Hampton that sells replacements. So, the failure mode on a W126 turns out to be not as easy or cheap as the older mechanically driven speedos.... Jim
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14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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#7
05-30-2007, 12:48 PM
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it's really simple to remove and replace the gears though. all three of my gears were soft as bubblegum, and just about fell apart in my hands. the VDO oem replacement gears are available for around 20.00 each. there are also companies that remake the gears and sell them as a set for 65... not sure what is best way to go. oe, is junk, remade ones may be better, or not...
John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#8
05-30-2007, 01:40 PM
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That's good information. I started to disassemble from the pictorial of D Giants and said whoo - this is different and stopped. Probably going to look like the picture of gear in link with teeth broke as it was just changing a group of "9" when everything stopped. If we get a rainy day maybe I will snap some pic's of the electronic speedo coming apart.
Good information guys!
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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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#9
05-30-2007, 02:46 PM
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hardest part I found in disassembling the speedo was getting those two plastic parts off of the circuit board so the speedo could be pulled out of the cluster.
not too bad. the gears are right on the outside of the speedo. the odd thing is, the gears that fail are connected to other gears that are made of a different kind of plastic, and those gears are STURDY!!! I wonder why they did not make it all the same... planned obsolescence I suppose. John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!! 1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#10
05-30-2007, 02:47 PM
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oh, and another thing, most tell you to make the hooks to pull the cluster out, some say to just get under it and push it out from below. I found it simpler to grasp the lower edge of the cluster, and put thumbs on top of the reset button and clock set buttons and just pull it out.
worked well for me on both of mine! John
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!! 1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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