DIY : R171 Trunk Struts Replacement - Page 3 - Mercedes Benz SLK Forum
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#41 Old 08-19-2011
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Thanks for this post, I've just replaced the struts on my 2001 R170 and it took all of 10mins to complete.
On the R170 there are no plastic stops to remove, Here's what I did:

I pushed the lid about 1" past its fully open position and popped the little retaining clip loose, (not off) on the top of the 1st strut.
Hey presto and the top of the strut simply came off the plastic ball joint, repeat for the bottom of the strut.

Remember the lid is now only being held up by 1 worn strut so keep your shoulder against it to stop if from coming down.

Pop the bottom clip on the new strut, put it on the ball, push the clip back into place and repeat of the top of the strut.

Repeat for process for the other side.

Makes a big difference, the boot now stays at what ever position I leave it at when I let go.

I got my struts from a Merc main dealer for £26 over the counter - Bargin!
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#42 Old 08-25-2011
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Thanks!

Do you have any pics?
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#43 Old 08-25-2011
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That is one REALLY clear guide - many thanks
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#44 Old 09-26-2011
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Removing old struts

I just replaced the struts. When removing the old struts, you do not need to remove the clip. Just stick a screw driver under the clip, then twist the screw driver to stretch the clip and it will come out of the ball joint. When putting in the new strut, just push it in.
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#45 Old 11-17-2011
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I was able to remove the old struts but now the new struts are too long (expanded too much) and don't line up to fit with the ball berrings on the trunk lid and arm. How do I compress the new struts down enough to make them fit so I can pop them onto the ball berrings?
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#46 Old 11-17-2011
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Just push it into place...they are not that strong...
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#47 Old 11-17-2011
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Thanks for the suggestion, but either I am the weakest person on earth or these things are made of cryptonite. There is no way I can just push the stuts close (they push back too), I have about 4 inches I have to clear so the bottom sturt will attatch to the ball on the trunk arm. Any other ideas? I tried greasing the stut and compressing it, but it did not give any. I purchased mine on ebay, maybe I got a really tight batch...
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#48 Old 11-17-2011
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Originally Posted by NPC3 View Post
Thanks for the suggestion, but either I am the weakest person on earth or these things are made of cryptonite. There is no way I can just push the stuts close (they push back too), I have about 4 inches I have to clear so the bottom sturt will attatch to the ball on the trunk arm. Any other ideas? I tried greasing the stut and compressing it, but it did not give any. I purchased mine on ebay, maybe I got a really tight batch...
Just double checking: Did you remove the rubber stops (held in place by triangular plastic base, the base can also be removed with gentle prying using flathead screwdriver) located on each side of the scissor hinge mechanism?

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#49 Old 11-17-2011
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Originally Posted by NPC3 View Post
Thanks for the suggestion, but either I am the weakest person on earth or these things are made of cryptonite. There is no way I can just push the stuts close (they push back too), I have about 4 inches I have to clear so the bottom sturt will attatch to the ball on the trunk arm. Any other ideas? I tried greasing the stut and compressing it, but it did not give any. I purchased mine on ebay, maybe I got a really tight batch...
Are they identical (i.e. same cylinder length and diameter) as your old ones?



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#50 Old 11-17-2011
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The problem was my non factory ebay parts. They would not align no matter what. I just went to the dealer and purchased the struts ($55 both) and they popped on without too much struggle. Never again will I buy non factory parts! Spent hours messing with what should have been a 10 min job! Also, if the struts are not lining up with the ball berrings, the ball berring on the trunk lid is adjustable up/down if you loosen it, reposition it, then tighten it again, then attatch the strut.
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#51 Old 12-21-2011
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I just replaced the trunk struts and having the photo how-to was helpful. I bought mine from mymercedesparts.com(aka mbsouthatlanta); $44.34 inc. shipping. I ordered them Sunday online, they shipped them UPS Monday and I received them before noon today(Wednesday)! Terrific service...and no fear of a concussion now, at least for another 4-5 years

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#52 Old 03-05-2012
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should I replace?

I bought my 06 SLK 55 used with 18K miles, should I replace it? I don't know what it feels like new. The trunk is a little heavy to lift. It will stay up but will come down when parked on my 6 degree drive way (the front of the car is higher).
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#53 Old 03-05-2012
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If you dont remove the rubber stops from the hinges you just making hard work for yourself if not impossible. If the struts went on without removing the rubber stops then I doubt they will last very long. I used after market ones and they are far superior to the MB OEM ones. Think about it. If the OEM ones were any good we wouldnt be needing to replace them !!!!!!
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#54 Old 06-20-2012
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Just followed this, a 10 minute job at most. Thanks! Now my trunk doesn't feel heavy any more! :-)
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#55 Old 10-03-2012
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Did anyone grease their ballbearings when replacing? If so what grease did you use?
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#56 Old 10-03-2012
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Spring is here~Gummi Pflege! Lube your seals/Lithium grease your joints /hinges


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#57 Old 10-03-2012
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Thanks jbanks, but no mention of the grease they used for the ball bearings for the trunk struts. I think I'll replace them as is. If while getting them off there isn't any grease at all I'll call up the dealer and ask.
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WOW the new struts make an amazing difference.
My struts before were still in pretty good shape, hadn't ever once "fell on me" unlike others, but I didn't need to slam the trunk shut anymore, so I knew it was time.

Replaced them and now they are very stiff! yay.

Also: it looks like white lithium grease, and actually, the OEM struts (I got them at SLKstore) come with some preapplied.
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#59 Old 10-03-2012
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Thanks jbanks, but no mention of the grease they used for the ball bearings for the trunk struts. I think I'll replace them as is. If while getting them off there isn't any grease at all I'll call up the dealer and ask.
you might have missed the lithium grease pic in my post.
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#60 Old 11-12-2012
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Does it make it easier to open the trunk, or just hold it up better? I thought the latter...

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My pleasure!

I noticed a big difference on lifting the trunk, almost didn't remember how easy it was wen it was new.
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