Discovery 2017

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  • Wolfpack
    Member Since: 25 May 2019
    Location: Norfolk, UK
    Posts: 538
    United Kingdom 
    2017 Discovery Si6 HSE Corris Grey

    Well that’s a serious level of seal lift you have there. Shocked
  • JBFUK
    Member Since: 25 Apr 2022
    Location: South East
    Posts: 92
    United Kingdom 

    It really is. It's like the whole thing was under tension and eventually the adhesive has failed and it's just popped off. It' been perfectly fine until suddenly leaking yesterday morning. The winter has been super wet so I would have noticed any previous leakage.

    I guess I'll need to try to run some silicone sealant in there from inside as a temporary fix.
  • Wolfpack
    Member Since: 25 May 2019
    Location: Norfolk, UK
    Posts: 538
    United Kingdom 
    2017 Discovery Si6 HSE Corris Grey

    Don’t bother! I spent weeks and multiple concoctions…nothing worked.

    I threw a cheap plastic tarpaulin over the roof held on in all but strong winds with a 4 bunji straps.

    Dont laugh …I actually spread across several strips of cling film between windscreen and sunroof when it first happened while I sourced all the sealants known to man.
  • JBFUK
    Member Since: 25 Apr 2022
    Location: South East
    Posts: 92
    United Kingdom 

    Well, I have to at least try, It's not realistic to think I can constantly keep a tarp over it for the next few weeks, perhaps while parked at home but it will also need to be used whatever the weather.

    Logically if I can see where the seal has failed, it should be possible to fill that gap with some sealant.

    Did you look at removing the external trims and sealing from the outside?
  • JBFUK
    Member Since: 25 Apr 2022
    Location: South East
    Posts: 92
    United Kingdom 

    So it seems like for this leak to happen two failures have occurred. The main seal of the bonded gasket, but for it to get to that the roofline seal has to also let water pass. I thought I would give the roofline seal a clean to help its chances of sealing against the roof panel, but found on the passenger side (where my leak is) that around 30cm of the seal has actually perished and become detached from the windscreen.

    I've attempted a two prong patch up. First I've run a thick bead of silicone into that roofline seal/channel to avoid water finding its way through the gap where the roofline seal has perished. Second I've run a small silicone bead along the inside of the main gasket (shown in the video) with outward pressure applied to the screen to open up the gap as much as possible and get a bit of sealant inside.

    There's potentially rain forecast tomorrow so I guess I'll see whether this helps. I've left the internal a-pillar trim off so I should easily spot any water coming in and running down there.

    If this isn't effective I'm thinking that next I'll try running a strip of clear t-rex tape over the windscreen/roof-panel joint

    Any tips for drying out the footwell? The carpet is dry but the foam pads underneath are still quite wet. I've used some more absorbent bed pads to try and suck out the worst of the moisture and have wedged something under the side of the carpet where I've removed the kick/scuff plate - to try to allow airflow.
  • Wolfpack
    Member Since: 25 May 2019
    Location: Norfolk, UK
    Posts: 538
    United Kingdom 
    2017 Discovery Si6 HSE Corris Grey

    I removed the external A pillar trims but the access gap along the top seal is too small to allow any sealant nozzle that way.

    The only way to attempt sealing would be to drop the headliner and go up inside. Shocked

    The visible rubber trim along the windscreen top edge is bonded to the glass so you can’t remove it to gain access along the top.

    In fact this trim is a bit of a puzzle!
    1) How come someone can securely bond THAT strip to the windscreen (mine was firmly attached to the removed windscreen ) but they cannot bond the windscreen to the car?

    2) That rubber trim is purely cosmetic. It is NOT a water seal!!. It’s behind this strip that all the water gains access to the windscreen sealant. Take a look where the rubber crosses the roof rail ditch. It is stretched across the ditch and doesn’t even touch the bodywork. Pour a cup of water anywhere along that ditch and it goes straight to the scene of the leak. In fact water gets behind that rubber strip all the way across the roof.


    I rattled on a lot about my windscreen leak for quite a few months. Being retired I had the luxury of not having to go out when it’s raining…so I’ve avoided leaks a lot of the time, but tried to stop them.

    One of the points I discovered early on was that the rubber trim bonded to the glass wasn’t leaking. I created a dam along that rubber gulley and nothing got through. The water only reached the leak when I over filled that dam and water went behind the trim where it crossed the ditch. I poured water at A.






    It then became apparent that you can easily allow water to get behind that rubber trim ANYWHERE along the roof. It’s not a waterproof seal! It’s just there is a greater opportunity for water ingress where the seal isn’t intimately touching the bodywork… across the ditch end.

    Regarding drying the floor well…I actually put a domestic dehumidifier in the car overnight and that took out a load of moisture. But the key thing for me was to have a tray with water absorbing material on the dashboard under the leak …to catch it before it did more damage. Bear in mind I could identify the exact (lowest point) drip point in the headliner on mine…so I just put a catch tray underneath whenever I parked the car away from home.
  • JBFUK
    Member Since: 25 Apr 2022
    Location: South East
    Posts: 92
    United Kingdom 

    I don't think that trim is purely cosmetic. It isn't the main water seal, that should be the main rubber gasket, but I think it helps to reduce the amount of water that gets to the main seal. Yes if the main seal is good then you shouldn't need it, but.... Rolling with laughter

    Anyhow I did drop the headliner last night to make access to the main seal internally a bit easier. Dropping it isn't too difficult, you just need to remove the a-pillar trim, bolts for the sun visor and grab handle. Then pull. Also helps to drop the overhead console unit too.

    It hasn't rained much today, but a few showers. So far no signs of new water getting in. If it doesn't rain in any significant way in the next few days I may put the hose on it and then check the inside of the main seal with the inspection camera for any drips. You might think if it doesn't rain, great, let it be. But I'd rather know if it is going to leak so I don't get caught out in a situation where I can't take any action.

    This thread should probably be moved into the faults and fixes forum now that it's taken this diversion!
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