Rebuild Trunk Cylinder Help - Mercedes Benz SLK Forum

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#1 Old 05-01-2012
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Rebuild Trunk convertible Cylinder Help

I rebuilt all the cylinders today and the top works fine, and locking cylinder works fine... what doesnt work fine are the trunk cylinders.

Now I'm going to kick myself because these WEREN'T LEAKING... I just thought I'd replace them all at once... urgh.

Anyway, I rebuilt them per the instructions, and they open fine, but closing was a different story. I sheered off the cotter pins to a spraying of hydraulic fluid. The right side was the one that blew. The left side "lifted" to some small leakage but didn't blow (but I'm sure if I fix the right side the left side will blow!. (instructions said to just use two... I even opted for three!)

Anyway, It doesnt appear to be weldable steel, so what have others used? does it require a special high grade cotter pin? or should I drill holes diagonally, or should I put some sort of clamp over the top?

I've heard of a few people rebuilding the trunk cylinders, so it must be possible theoretically, but now I can't even go buy some rebuilt ones... urgh.

Amy pointers appreciated!
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#2 Old 05-01-2012
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#3 Old 05-01-2012
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Originally Posted by jbanks15 View Post
yes, you can buy new ones here:

Mercedes-Benz SLK Trunk Struts
Thanks for the link, but unfortunately I'm talking about the convertible trunk cylinders
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#4 Old 05-01-2012
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Nevermind- problem solved. Here's a tip for anyone that gets in the same predicament.

Get a small drill bit. Drill diagonally between two of the 5 holds. Stick a larger cotter pin through it. Now do the same through two different holes. Once again stick a larger cotter pin through it. There you go- Leak free is the way to be.

I think I may just do a quick FAQ on top rebuilds just because it seems like there are a lot of unanswered questions on here.
https://www.slkworld.com/slk-r170-cla...tml#post302736
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#5 Old 05-01-2012
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Originally Posted by Arachnyd View Post
I rebuilt all the cylinders today and the top works fine, and locking cylinder works fine... what doesnt work fine are the trunk cylinders. . . .
All the Cylinders? There is the Latch cylinder (front and center on the roof near the winshield) two roof cylinders (one each behind the driver's and passenger's outer shoulders) and two trunk (lid) cylinders (one each in the outer/rear most wells of the trunk.

So far, the cylinders that are most easily rebuilt with the O-rings are the latch and roof cylinders. The trunk lid cylinders are crimp based assemblies and most likely require special tools.

I've had very good results with having all 5 of mine rebuilt/upgraded from Tophydraulicsinc.com.

Last edited by lilred320SLK; 05-01-2012 at 10:49 PM. Reason: grammer correction . . . bah!
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#6 Old 05-01-2012
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Originally Posted by lilred320SLK View Post
All the Cylinders? There is the Latch cylinder (front and center on the roof near the winshield) two roof cylinders (one each behind the driver's and passenger's outer shoulders) and two trunk (lid) cylinders (one each in the outer/rear most wells of the trunk.

So far, the cylinders that are most easily rebuilt with the O-rings are the latch and roof cylinders. The trunk lid cylinders have are crimp based assemblies and most likely require special tools.

I've had very good results with having all 5 of mine rebuilt/upgraded from Tophydraulicsinc.com.
Ended up rebuilding the trunk cylinders pretty easily too... all-in-all, I rebuilt all 5 of them. You can see some of the tips and tricks from my experience at:

Some tips and tricks for convertible top cylinder rebuilds

Thanks for all your help though, you did help me over that first hump of getting rolling
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