Advice needed - Roof latch cylinder failing to latch - Mercedes-Benz Forum
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 09-19-2018, 09:37 AM Thread Starter
BenzWorld Newbie
Date registered: Sep 2018
Vehicle: 2005 SLK 350
Location: Hastings, MN
Posts: 1
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Unhappy Advice needed - Roof latch cylinder failing to latch

So I went through the process of replacing the piston rod seal with a seal purchased off of eBay, following instructions that I found here. After I assembled everything, the roof would not operate correctly. I figured it need more hydraulic fluid, so following a guide here, I was able to access the pump reservoir and added the correct MB fluid until the roof was able to complete it's cycle of raising & lowering the roof/trunk components completely.

But it appears that the latch cylinder is not holding pressure - it latches the latches to lock the roof in place, but then seems to 'relax' and releases pressure so the latches back off from being completely closed.

Looking at this diagram - I don't think it is not sealing around #9 - the piston seal.

The image seems to indicate that the piston seal is almost a rubber gasket. I didn't take any pictures when mine was disassembled, but I seem to remember that this was more of a metal bushing on the piston.

Does anyone have any ideas on how to trouble shoot this - or what my next step is? Is it possible to just purchase the piston? Without the whole latch cylinder?

csantelman is offline  
Sponsored Links
post #2 of 2 (permalink) Old 10-13-2018, 04:46 PM
DP's Avatar
Date registered: Aug 2002
Vehicle: 190E, SLK350
Location: Chesapeak Bay
Posts: 66,823
Mentioned: 3 Post(s)
Quoted: 2105 Post(s)
Lifetime Premium Member
Can you film your setup and operation?
DP is offline  
Sponsored Links

  Mercedes-Benz Forum > Mercedes-Benz Roadster Forums > R171 SLK-Class

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Title goes here

video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome