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Rear axle SLS valve leaking

Started by BCK1963, 02 May 2021, 11:19 AM

BCK1963

Hello,

the rear SLS actuator of my  car is leaking a bit and I think ahead of how to best get that fixed. The rubber protector is done and I have new replacements. So some questions into the audience concerning that topic.
It looks to me like the front and rear units are identical and even interchangeable with W126 parts. The W116 parts calalogue lists only the W126 part 126 320 0658. Correct?

Has anybody ever worked on that? What are typical causes for leakages on this part? Its interior looks more complicated that the valve unit in the engine bay on top of the fluid reservoir. Can that be done without specialized tools?

Unfortunately I don't have a lift where I could leave the car resting on for a longer time. In my wildest dreams I think of swapping front and rear units and be able to work on the leaking one during the next winter with the car on blocks. Would that make sense?

   Thanks ahead
Bernd

1976 Merc 6.9   Magnetit blue

daantjie

Bernd, yes the front and rear valve is the same and also it is the same number and part shared with the W126, both Gen 1 and Gen 2 systems.

Best option is to send them to Martin Werminghausen for rebuild.  Member "tcj" - Thomas can put you in contact with him as well.  Martin is based in the US - Massachusetts I believe and I think Thomas is in Germany.

Mostly I have found it is the shaft seal which leaks, and usually the rear one goes first.  Then you get hydro oil leaking out, and this then eats the rubber boot over time.  Changing the boot only will not help the leak situation and you may as well go the full rebuild route then.

Cheers
Daniel
1977 450 SEL 6.9 - Astralsilber

nathan

If cost is an issue, perhaps try and get one off another car?
I swapped mine out of the 123 a few months ago, a short video how I removed it which was pretty easy
https://www.youtube.com/watch?v=LCQEXRdwjbY&t=135s
1979 116 6.9 #6436
2018 213 e63
2011 212 e63
2011 463 g55
2007 211 e500 wagen
1995 124 e320 cabriolet
1983 460 300gd
1981 123 280te

BCK1963

Thanks Daniel, Nathan,

maintaining this car at a more than minimum level is always about costs, I guess.
I tried to find a cheap valve for diy trying but for the prices asked I can have mine revised.
Thomas / tcj is located in Germany and I know him by phone. He is one of the guys who is specialized in repairing HPF parts.
But, as I said, I don't have a lift or place available where I could leave the car for an extended time with the rear valve removed.
So I probably have to get a revised one and send mine back as core.

Just in case:
Are the shaft seals easy to remove and available? The seals in the unit above the reservoir are only for specialists.

    cheers

Bernd

1976 Merc 6.9   Magnetit blue

daantjie

To change the shaft seal you need to take the whole valve apart, so at that point you may as well have the valve checked and rebuilt.
Daniel
1977 450 SEL 6.9 - Astralsilber