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Discussion Starter #1
Hi..My 2006 SLK 280 has developed a leak at the Hydraulic Cylinder front lock. (everything is still working but just leaking)...I have searched this forum and did not find much about this problem. Can anyone share any DIY front cylinder replacement steps or does this need to be repaired by the dealer..Pictures Attached...Thank You for your help!





 

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Administrator 2009 SLK 55 AMG/Founding member 2006
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Administrator 2009 SLK 55 AMG/Founding member 2006
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Discussion Starter #4
Thanks...The posting from the R170 was very helpful...so I don't have to replace the entire cylinder but only the rubber black seal. Where would one go to purchase the seal replacment
 

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Administrator 2009 SLK 55 AMG/Founding member 2006
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head to our sponsor section for a couple of parts dealer's or your mb dealer
 

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Discussion Starter #6
Reviewed the R170 procedured more closley and I will need to drill a hole into the cylinder to get access to the retaining ring..not a good idea for me. I would like to replace the entire cylinder body but how do I get the two hydraulic tubes disconnected from the cylinder body?
 

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I work with maintenance and overhaul of hydraulic systems incl. cylinders everyday. I have to advice you to NOT DRILL on the cylinder! If you get any metal, dirt or other particles in the chamber or in the hydraulic oil this WILL cause damage! Maybe not right away, but it will in the long run. When it comes to hydraulics, cleanliness of the oil is everything. Particles will cause damage to cylinders and other parts and can be very costly.

If i could see a better photo of the hoses to the cylinder i can possibly help as best as i can from the pictures. Replacing an o-ring or dowty seal is VERY EASY.
 

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BarryEdward, remember - Clean Clean Clean!!!! Get a can of WD-40 as I did. 2000-3000 grit sandpaper in case you need to clean the hole from shavings. Use WD-40 abundantly. Make sure it flows out of the cylinder. Put it on a rag for a couple mins upside down like I did.
You can't remove the lines from the cylinder! Be careful not to twist or bend them in any way! They only place you disconnect the lines is at the pump itself (in the trunk). If you have money then you can buy a new cylinder which is at least $373 + shipping from online dealer! But to replace it you need to remove the cylinder with the lines and then take your new new one and guide the lines, meaning panel removal, etc. There's one place http://www.tophydraulicsinc.com/en/ which will rebuild them for you for $295 for the whole set. But! You need to take all the cylinders by yourself and send them. (note that the lines are permanently attached to the cylinders =( )
and here's their cylinder removal guide:
http://www.tophydraulicsinc.com/R170 SLK-Class Cylinder Removal.pdf
 

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Jayson..where did you get the replacement O ring from for the front cylinder
I got the O-ring kit from the Ebay. Search this forum for shockwave technologies. I'm on my phone so can't really play with windows conveniently. I don't know if the rings/cylinders are the same on your r171. you might want message Marty and ask him or may be other owner's of the r171's can give advice. Didn't hear anyone repairing 171 cylinders but from the picture everything looks the same :)
 

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Discussion Starter #13
Question: Is the only way to get the retaintion ring out is by drilling a hole in the body? There is no other tool to use (Like a retaintion ring puller)

I have a message into Marty with Shockwave asking him will his Mercedes SLK 230 320 Hydraulic Cylinder Repair Kit for Hardtop Convertible R170 work for my R171 that his is selling on Ebay?
 

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Question: Is the only way to get the retaintion ring out is by drilling a hole in the body? There is no other tool to use (Like a retaintion ring puller)

I have a message into Marty with Shockwave asking him will his Mercedes SLK 230 320 Hydraulic Cylinder Repair Kit for Hardtop Convertible R170 work for my R171 that his is selling on Ebay?
Here you go:
http://www.ebay.com/itm/Mercedes-SLK-230-320-Hydraulic-Cylinder-Repair-Kit-for-Hardtop-Convertible-R170-/280773278277?pt=Motors_Car_Truck_Parts_Accessories&hash=item415f643a45&vxp=mtr
Yes, write him a message!

Marty suggests another method by pushing the white plastic ring into the cylinder so you can expose the retaining. But it seems a bit difficult and not everybody succeeds. I didn't bother. Bought his instructions, and just drilled. You need to depressurize the system and push the rod all the way into the cylinder. Measure carefully and drill. The metal of the cylinder is Very soft, so go slowly, then you'll hit the retaining ring. You'll feel it! It will become hard or the drill will stop if you're going slow. Then you might use like a special hook tool. Smth like this: http://www.walmart.com/ip/Mayhew-Tools-Dominator-Pick-And-Hook-Set/19293443

or small screwdriver like i did :biglaugh:.
 

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Discussion Starter #15
Thanks that's very good info...but the million dollar question still needs answering..will the R170 kit work for the R171 cylinders..or will I need different O-rings..I'm still waiting on Marty to respond
 

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Discussion Starter #16
Well Marty responded and is 99% sure that the R170 repair kit is one in the same for the R171...So I will order and follow up with the forum if it worked or not
 

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Discussion Starter #17
Help Please...I need to get to the Vario Roof Pump to release pressure and refill and I know its behind the back center area in this picture...How do I get behind all this? Any DIY instructions? My search finds nothing for the R171
 

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