Popular Post GregD2016 Posted February 19, 2017 Popular Post Share Posted February 19, 2017 Hi all, Not sure if it has been covered here in the past or not so I thought I'd share... I've been suffering from the dreaded "Trunk Clunk" for months and this weekend, I finally decided to look into it. Basically, there is a rubber/metal counterweight fitted within the rear hatch to aid opening/closing as well as damping vibrations by frequency matching but 180 degrees out-of-phase. Over some bumps it moves so much it contacts the inner structure of the hatch giving the most annoying and predictable 'clunk'. I found this guide really helpful and it seems to have solved the issue for now! http://www.planet-9.com/reviews/miscellaneous/p7-porsche-stopping-the-hatch-26quot-3bclunk-26quot-3b.html Greg. 3 1 Link to comment Share on other sites More sharing options...
Windymiller Posted June 28, 2020 Share Posted June 28, 2020 Damn it - I’ve just getting this too now and the planet 9 link no longer seems to be active. Anyone else fixed this? Back to google for now I guess... 🤔🤷♂️ Link to comment Share on other sites More sharing options...
Popular Post Maxheadroom Posted June 28, 2020 Popular Post Share Posted June 28, 2020 11 hours ago, Windymiller said: Damn it - I’ve just getting this too now and the planet 9 link no longer seems to be active. Anyone else fixed this? Back to google for now I guess... 🤔🤷♂️ I had a similar problem with clunking rear trunk lid some time ago and stumbled upon the Planet 9 thread. Ripped out all the trim to get access to counter weight, this all appeared ok so gave up for a while. Later on I had a play with the rubber bump stops screwed into to the trunk. Didn’t realise they were adjustable so wound them out a quarter turn went for a drive. Clunking rear trunk now not clunking, problem solved. Bought a new set and noticed the old ones were slightly shorter than new ones so assumed they had become compressed/deformed over the years. 2 1 Link to comment Share on other sites More sharing options...
Windymiller Posted June 28, 2020 Share Posted June 28, 2020 @Maxheadroom - thanks for the Intel. I’ll wind em out a little, see if that resolves it. And perhaps order some new ones of it does. 👍🏻 1 Link to comment Share on other sites More sharing options...
Maxheadroom Posted June 29, 2020 Share Posted June 29, 2020 21 hours ago, Windymiller said: @Maxheadroom - thanks for the Intel. I’ll wind em out a little, see if that resolves it. And perhaps order some new ones of it does. 👍🏻 No probs @Windymiller, keeping fingers crossed as it’s such a simple fix Link to comment Share on other sites More sharing options...
Rob66 Posted June 29, 2020 Share Posted June 29, 2020 Thanks for the tip, I get this rattle sometimes so I have just unwouned mine quarter turn. They feel secure but a little loose now so will see if it helps. 1 Link to comment Share on other sites More sharing options...
Windymiller Posted June 30, 2020 Share Posted June 30, 2020 I’ve just wound mine out a half turn, the boot lid for felt ‘tighter’ when I closed it. Will go for a drive and report back on whether that’s solved the ‘rattle-clunk’... 1 Link to comment Share on other sites More sharing options...
Craiglm68 Posted July 1, 2020 Share Posted July 1, 2020 Look forward to your updates....might try this fix myself (my mechanical skills are VERY limited re anything more involved...) 1 Link to comment Share on other sites More sharing options...
Windymiller Posted July 1, 2020 Share Posted July 1, 2020 Well back from a drive and the noise is still there. 🤔 it does sound like something ‘jiggling’ about somewhere ‘in the boot’, and as the boot is empty I think it likely is the counterbalance weight in the boot lid clonking around a bit. think I’ll need to Strip the boot lid trim off (once I’ve found a ‘how to’). Link to comment Share on other sites More sharing options...
Maxheadroom Posted July 2, 2020 Share Posted July 2, 2020 15 hours ago, Windymiller said: Well back from a drive and the noise is still there. 🤔 it does sound like something ‘jiggling’ about somewhere ‘in the boot’, and as the boot is empty I think it likely is the counterbalance weight in the boot lid clonking around a bit. think I’ll need to Strip the boot lid trim off (once I’ve found a ‘how to’). Damm, that's a shame . Did you try and wind buffers out a tad more until their nearly fully out ? there is a "how to" out there somewhere think it was on plant 9 too which I used to remove trunk trim, think all I needed was a good selection of trim removal tools ( plenty on ebay ). Link to comment Share on other sites More sharing options...
GlosRich Posted July 2, 2020 Share Posted July 2, 2020 I've had to wind mine out a fair way to keep the tailgate quiet. Does make closing it quite a hard push though. Beyond that the clunking may be suspension, possibly rear top mounts? Link to comment Share on other sites More sharing options...
Windymiller Posted July 2, 2020 Share Posted July 2, 2020 Thanks both, I’ll wind out some more and go for a drive on Saturday. I had thought it might be a suspension noise, but it really does sound like something ‘jiggling’ rather than knocking / clonking, and seems only / more noticeable at lower speeds over constant bumpy surface - like a resonant frequency is reached causing the counter weight to oscillate 🤔 ive got a Nielsen trim tool set - best £9 spent on amazon ever, especially when it came to recent centre console removal and recent Kia Sportage door trim removal for an intermittent window switch problem 😉👍🏻 Link to comment Share on other sites More sharing options...
GlosRich Posted July 4, 2020 Share Posted July 4, 2020 The tailgates do jiggle around a bit, thats why the paint rubs off on the seal by the roof. Link to comment Share on other sites More sharing options...
Rob66 Posted July 4, 2020 Share Posted July 4, 2020 (edited) I'll try mine later. Also worth checking that the rear lights are securely in place, sounds crazy on a Porsche I know but my rear left felt a little loose. Also check the trim panel that covers the rear of the light, there should be little white cup that the ' clip' fixes into. Mine seemed loose so I added a bit of packing to it. Edited July 4, 2020 by Rob66 Link to comment Share on other sites More sharing options...
Bushman Posted July 5, 2020 Share Posted July 5, 2020 hi guys, I had "trunk clunk" when I first got my Croc 4 years ago, when I stripped the lid trim off sometime later to fit the rear spoiler I found the mass damper wobbling on its rubber mounts and would clonk the lid when moved hard. I loosened if off and put foam tape underneath, the black closed cell tape with adhesive on one side that's about 6mm thick and probably 20-25mm wide (RS Components). then tightened it all back up again. Sorted, never has another clonk since. hope this might help. Link to comment Share on other sites More sharing options...
Windymiller Posted July 7, 2020 Share Posted July 7, 2020 Thanks Steve - would you have a link to a ‘how to’ guide for the trunk trim removal please? 1 Link to comment Share on other sites More sharing options...
Windymiller Posted July 13, 2020 Share Posted July 13, 2020 So I wound the trunk-lid bump-stop thingees all the way out and that didn’t stop the noise. I don’t think it is the tail-lid itself moving / rattling - it certainly sounds like something inside it ‘clunking’ about over smaller, lower frequency bumps. I found this item for a bit of insight into how to remove the trim. I’m away with work currently so will have a go once back home later this week. https://www.planet-9.com/threads/removing-trim-from-rear-hatch-on-cayman.98235/ I think I will also get some new trunk-lid bump-stop thingees ordered anyway - surely they can’t cost much 🤔🤷♂️ Link to comment Share on other sites More sharing options...
Founder Beanoir™ Posted July 13, 2020 Founder Share Posted July 13, 2020 17 minutes ago, Windymiller said: So I wound the trunk-lid bump-stop thingees all the way out and that didn’t stop the noise. I don’t think it is the tail-lid itself moving / rattling - it certainly sounds like something inside it ‘clunking’ about over smaller, lower frequency bumps. I found this item for a bit of insight into how to remove the trim. I’m away with work currently so will have a go once back home later this week. https://www.planet-9.com/threads/removing-trim-from-rear-hatch-on-cayman.98235/ I think I will also get some new trunk-lid bump-stop thingees ordered anyway - surely they can’t cost much 🤔🤷♂️ I did this on my Cayman S, my solution being very similar to what Steve described above. It's easy enough to do, just a bit time consuming removing all the trim. Having some of those plastic trim removal tools does make the job easier. Link to comment Share on other sites More sharing options...
Founder Beanoir™ Posted July 18, 2020 Founder Share Posted July 18, 2020 10 hours ago, donald311 said: care to share Well, like I said, solution for mine was to remove the boot lid plastic trim and insert some foam between the damper and the boot lid. Word of caution though, there are a number of things that can cause rattles and clunks in the rear of a Cayman. Always check the following: 1. Boot Lid Bump Stops - ensure they are adjusted correctly 2. Rear light clusters - often become loose and need tightening up 3. Boot Lid Rubber Cushion - halfway up the boot lid are rubber cushions that become compressed with age and use. Replace these. 4. Boot Lid Trim - if they plastic trim/cover has been removed and refitted poorly or without the correct metal fixings then this can rattle and knock 5. High Level Brake Light - has been known to be a source of rattling and can be fixed with foam padding 1 Link to comment Share on other sites More sharing options...
Windymiller Posted July 19, 2020 Share Posted July 19, 2020 Finally took my trunk lid apart (I’ll post a ‘how to’ guide when I reassemble it all) and think I’ve found the issue. the counter balance mass has a split in the rubber ‘flange’ on it, and I note there is now an ‘mk 3’ version of it so probably an improved version. see photo for split - I’m assuming this would make it ‘wobble’ more over smaller frequency bumps... 🤔🤷♂️ 1 Link to comment Share on other sites More sharing options...
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