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Discussion Starter #1
Hi guys, wife just came back home, said "The roof is Leaking Passenger Side". Went out to find an oily residue where the roof meets the windscreen. definately oil and not water, but not alot at all. Leak is only visible inside not out









Any help or suggestions would be appreciated

Thanks
 

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Discussion Starter #2 (Edited)
Just saw a few posts where it could be the vario roof cylinder but my leak seems to be only on the passenger side, if it is a leak at all? Trying to figure where the hydraulic fluid reservoir is for the roof to see if its low etc
 

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And there is hydraulic cylinder in the windshield header which actuates the roof locks there; given where you are seeing the oil it is probably that actuator that is leaking (the seals eventually fail). Threads here for the brave on how to drill into the thing to renew the seals. I don't speak from experience; merely from reading about the topic here.
 

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I had the same problem. It was a leaking lock cylinder. The cylinder is in the front middle of the roof and that is just where it leaks out. If you have a circular port in the center you can pop it off and look in with a flashlight. Look through the threads and you will know what to look for.

The seal is inexpensive to DIY if you have some moderate skills or the dealer can handle it. It is also easy to remove the headliner (search for procedure) and them the mechanism is all right there in front of you. I drove around like that for a couple of weeks fixing mine.

Best Wishes
 

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Discussion Starter #7
And there is hydraulic cylinder in the windshield header which actuates the roof locks there; given where you are seeing the oil it is probably that actuator that is leaking (the seals eventually fail). Threads here for the brave on how to drill into the thing to renew the seals. I don't speak from experience; merely from reading about the topic here.
Is that in the roof itself
 

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Discussion Starter #8
The center lock cylinder would cause a visible leak along the roof lining toward the right passenger side and also around maybe the port hole? I have nothing there at all
 

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I have an '06 R171. The oil that leaked out of my cylinder didn't discolor the headliner at all. It just flowed around in the headliner until it found a way out, which for me was on the front right side.

It could be another component, but the most likely cause is the seal on the lock cylinder. It is a common problem and the rest of the roof hydraulic system is pretty well leak proof.

Search "lock cylinder"
 

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@Gorhad
Sorry to heard that, can you please tell us if you use your vario roof regularly, i was reading that lack of using your roof will lead to this kinds of problems.


So in order to prevent this we must open and close the roof 2-3 times per week?
 

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Discussion Starter #11
Yes we use it probably about that, maybe more at the moment with the heat here in Florida
 

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Discussion Starter #13
Ok, found a thread relating to roof liner removal on the R170. Removal of 9 screws (3 front and 3 on either side), then the liner should pull forward and down. Is it the same for the R171?
 

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Discussion Starter #15
Ok big thanks to all so far.

Yes you were correct REB_TN_06 it is leaking from the lock cylinder and from the look of the underside of the head liner its run both ways but found its best escape on the passenger side, perhaps my tires are low on air that side :)



So just have to figure our the next step

I believe my son and i are slightly above layman mechanically skilled, we just completed a nightmare of a job, complete valve spring and seal replacement, on his 04 Infiniti G35, still that said, REB_TN_06, did you do your own and are there DIY's for it?

I read about drilling the seal out and replacing with an O ring

Thanks
 

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If you have done that you can definitely DIY the lock cylinder. Buy an O ring off eBay and then look at the lock cylinder threads. You are correct it calls for drilling out the housing to get the lock ring out. I'm remote now but I can post the links later this week.
 

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Discussion Starter #17
Confirmation off Marty (shockwave technologies) R171 O ring kit

04 09 Mercedes SLK 280 350 SLK 55 AMG R171 Hydraulic Cylinder Roof Repair Kit | eBay

Lets get ready to rumble

PS. REB_TN_06, yes we did it, took 4 weekends working blind, making mistakes, making DOHC (internal spring) compression tools, figure timing chain etc etc etc. The compression tool alone from popular aftermarket performance guy was 300 bucks, drew it up on adode, made it with help from local welding company for $30 did all 24 valves perfect

i would like to make a complete DIY for newbies on this because it all seems to be bits and pieces around and about.

Advice on what i need to do to produce that would be appreciated
 

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Discussion Starter #18
OK its on its way

Meantime, to release the pressure on the piston i read in a post to just close the roof fully then open it and just as the piston unlatches/unlocks release the button and the piston should be easier to compress inward to its furthest point?
 

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Gorhad,
As far as I can remember I took the cylinder off with the roof up and locked into position.

My Advice:
- Take a lot of pictures of the assembly before you start taking screws out. There will be paint showing the position of things, and you want to be able to put it back exactly as it was when it came apart.

- The O kit ring will have lots of instructions. They are very beneficial.

- You can't disconnect the hydraulic lines from the cylinder. They are an integral unit. Therefore you will need to drill and work on the cylinder while the hydraulic lines are still attached to the car. I detached everything as far as possible and was able to get the cylinder outside of the car to work on it. A portable workbench with a vise would be a great help. I didn't have one. On a related note you want to free up the lines to get as much travel to work as possible. Thus you will be disconnecting the feed and return line as far back along the roof as you can. I believe that they ran down the RH side of the roof. Once again, take pics so that you know how it all goes back together.

- Be very careful when working with the cylinder. The last thing you want to do is to either get dirt or metal shavings in the system or to scratch the piston. Flushing the cylinder out with a solvent and wrapping the piston with electrical tape are both excellent strategies. The hardest part for me was actually getting the retaining ring back into position. If I had it to do over again I would do what another user did and use a snap ring of the same size and snap ring pliers instead.

- Try and lose as little hydraulic fluid as you can. The system is self bleeding (doesn't matter if you get air into the line) and has a reservoir attached to the pump. I didn't even have to add any extra hydraulic fluid after the repair. If you do then the pump is behind the seat and there's a thread on here on how to get to it.

Here's the best picture on what you are getting ready to do with the cylinder, courtesy of SLKWorld member Sokoloff. http://www.benzworld.org/forums/r170-slk-class/1638473-slk-top-cylinder-rebuild-guide-cut.html

Best Wishes,
 
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