Servo Unit Problems - Mercedes-Benz Forum

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post #1 of 14 (permalink) Old 03-19-2006, 11:41 AM Thread Starter
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Servo Unit Problems

What exactly malfunctions? There is a place that offers rebuilt servo units for just under $500, and I thought to myself if they can offer a rebuilt one that means they can be rebuilt. Is there any instructions out there for such a thing? If I knew what went bad on the bit it would be a lot easier, and much cheaper.
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post #2 of 14 (permalink) Old 03-19-2006, 02:39 PM
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RE: Servo Unit Problems

Quote:
dubnluvn - 3/19/2006 12:41 PM

What exactly malfunctions?
The servos generally fail one of two ways. The first is the failure valve unit inside the servo. The rebuild kit essentially is a new sliding valve and some hardware. So, the failure of the valve can be remedied.

The much more common failure is the physical cracking of the servo housing itself, which cannot be remedied.


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post #3 of 14 (permalink) Old 03-19-2006, 02:57 PM
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RE: Servo Unit Problems

Yes there is a kit available, but it's almost prohibitively expensive, and frequently fails to have the desired effect. Reman servos are $465, and remain the best option if you're unable to repair yours.

http://www.germanstar.net/123h.htm

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post #4 of 14 (permalink) Old 03-24-2006, 05:18 PM
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RE: Servo Unit Problems

Yes, when these crack cooalng gets into the internals with the mechanical end electrical parts...corrosions sets in parts jam and burn up from binding.

I know someone who used to rebuild these but parts are hard to find and many failed units are beyond repair.

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post #5 of 14 (permalink) Old 03-26-2006, 02:40 PM
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RE: Servo Unit Problems

I have one of a 79 280 se all apart. I have not been able to remove the valve from the plastic housing yet. It appears I might be able to salvage everything from the valve up, though I do have some cracks in the housing. I have the 12VDC motor operating and turning the gears. Dosent the valve stem on the valve have its own seal? or does the seal seal on the plastic housing. Anyone have a detailed drawing or photos of the sealing mechanism on the valve stem? Bob
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post #6 of 14 (permalink) Old 03-26-2006, 09:35 PM Thread Starter
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RE: Servo Unit Problems

yes a technical drawing would be nice...I'll be taking mine apart this weekend...
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post #7 of 14 (permalink) Old 04-06-2006, 02:57 PM
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RE: Servo Unit Problems

i finished disassembly of mine. I only have to remove the seal mechanism in the plastic module. I can take digital photos of the thing all apart...its actually quite interesting. Bob
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post #8 of 14 (permalink) Old 11-06-2006, 07:19 PM
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Does anyone have any photos/diagrams, etc of the internal components and assembly of the servo unit? I'm an idiot and took mine apart this afternoon without thinking, and now I have pieces of the inside everywhere, all of the vacuum connections (on the inside) got disconnected, etc.

ANY help would be appreciated!

Thanks!
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post #9 of 14 (permalink) Old 11-19-2006, 09:48 AM
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Quote:
Originally Posted by GermanStar
Yes there is a kit available, but it's almost prohibitively expensive, and frequently fails to have the desired effect. Reman servos are $465, and remain the best option if you're unable to repair yours.

http://www.germanstar.net/123h.htm
Ron,
Pleae elaborate on kit. I just installed a Unwired kit in a client's sons car. It took two hours and seems to perform well. Have you had problems with this kit? I don't usually work on vintage cars, but this guy has been faithful for many years, and the car belonged to the kid's grandpa. My client says to keep his son's car going at all cost, so I do. I chose to install the kit, because the only rebuilt servo available was an 03 which goes into the 116 and 107. This car is a 79 280 CE which requires the 06 in order for the flaps to work right. I hope I don't have any problems with this kit.
Peter
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post #10 of 14 (permalink) Old 11-21-2006, 01:54 AM
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How is the AC servo identified as a 03 or an 06? Are there identifying markings or others that have been used?

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