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Author Topic: windscreen seal  (Read 13942 times)
TELBOY
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Posts: 391



« Reply #15 on: February 05, 2020, 08:55:53 pm »

Hi Matraman.  I had a new screen fitted last year and watched  cafefully how it was done. The screen is bonded in and from my observations is more.or less.decorative. I purchased the correct strip  from France which was one long piece running from the back of the roof round  the screen and back along the other side of the roof and he cut a seperate piece for the top.of the screen. Before the  screen sealent was dry he pushed the seal into the mastic so its the masric that creats the waterproof seal not the sealing strip
There are a few photos on my blog page 11 if it helps.
Tel
« Last Edit: February 05, 2020, 09:10:39 pm by TELBOY » Logged
JL
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Posts: 250



« Reply #16 on: February 05, 2020, 11:29:48 pm »

Hi Matraman
If water is getting in it is likely that the windscreen has come unbonded, the strip is purely a decorative trim. I re used my original trim stuck back on with double sided foam tape - if I remember correctly I cut the small upstand off the bottom of the trim.

Hope this helps.
John
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Gib
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Posts: 83


« Reply #17 on: February 06, 2020, 08:44:22 am »

@ Matra Man. I have 2 sets of the seals that I ended up getting in 2018. So irrespective of the actual sealing issue (i.e it may need to be rebounded or resealed). You can buy the spare from me, once I find out how much it cost ( wasn't a lot from memory)
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Matraman
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Posts: 60


« Reply #18 on: February 06, 2020, 09:05:25 am »

Thanks for the info. Iíll investigate further and find out if itís a rebonding or just resealing  job. Iíll be in touch again Gib if I need a new strip.
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Andrew
roy4matra
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« Reply #19 on: February 07, 2020, 12:59:05 pm »

Thanks for the info. Iíll investigate further and find out if itís a rebonding or just resealing  job. Iíll be in touch again Gib if I need a new strip.

First, the windscreen was bonded in and the trim around the edge was only decorative.  So the bonding should be the waterproof seal.  However, after this many years and the constant flexing that the shell gets in use, bonding can crack and allow water in, so sometimes the screen needs to be re-bonded.  If re-bonding a screen or fitting a new one, an equal gap should be maintained all around the edge whilst the bonding sets (top, bottom and sides) for the trim to be fitted.  The original trim was 'L' shaped cross-section (see photo) and the barbed edge was inserted in the gap whilst the top was glued to the screen (it had double-sided tape for this).

Second, it it is not unknown for the metal chassis at the base of the screen to have corroded and the water leaks in through this, not past the trim and bonding.  So if this has happened, the screen needs to come out, and that area repaired before re-bonding the screen back in.

Third, there are other areas where water can get in and on to the parcel shelf.  One is the roof aerial is not sealing and just needs lifting out and some new sealant on the base before refitting.  Another is the grommet where the heater hose passes through the bulkhead into the matrix has deteriorated and is allowing water in.  Another problem can be the shield at the back of the front wheel arch can be poor or even missing as it was riveted on and since the rivets corrode, they can drop off!  Finally, when the roof panel was fitted, the edges should be sealed to the chassis rails, but again over time these can crack and leak.  The edges of the roof panel are hidden under the trims that come from the windscreen to the back of the roof ending under the top of the 'B' pillar trims.  So you may need to remove the roof trims and reseal the edges.

If you obtain and want to use the 'L' section trims that are long enough to go from the 'B' pillar trim one side forward down around the screen and back to the other 'B' pillar trim, then you have to cut the barbed arm off the underside of the trim where it fits on the roof, as these roof sections have to be flat.

When the cars were new (as mine was when I bought it) the factory fitted the roof and windscreen trims like this: There was one 'L' shaped trim that went from the top corner of the screen down around the screen and up to the top corner the other side.  There was a second 'L' shaped trim piece across the top of the screen.  Then there were two flat section trims across each side of the roof (and these were the same trim as used around the windscreen but with the barbed arm cut off.  If you removed them you could see the cut marks underneath where the arm had been sliced off!)  These were originally available as spares already cut to length, and with different part numbers.  To finish it off, there were two corner pieces (LH & RH) fitted to the top corners which hid the joints between the ends of the main trim, the top trim and the roof trims.

Unfortunately the corner trims have not been available for a long while, and I have only ever seen one other Murena with them still fitted.

Roy
« Last Edit: February 07, 2020, 01:07:41 pm by roy4matra » Logged

Matraman
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« Reply #20 on: February 07, 2020, 05:31:34 pm »

A few more areas for me to check, thanks Roy. The roof aerial is quite loose, so Iíll start there, also the heater matrix grommet has perished, so Iíll do that as well while the pipe is disconnected.
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Andrew
JV
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Posts: 137


« Reply #21 on: February 08, 2020, 09:24:57 am »


...Unfortunately the corner trims have not been available for a long while, and I have only ever seen one other Murena with them still fitted....


Perhaps they can be 3D-printed?
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Jan Verdam
Matra Murena 2.2S bleue columbia
suffolkpete
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Posts: 533



« Reply #22 on: February 08, 2020, 12:30:20 pm »

I had a chip repaired on my screen some time ago, and the fitter remarked that the trim appeared to be from a Mercedes Sprinter, so perhaps that might be worth pursuing.
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murramor
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Posts: 123


« Reply #23 on: February 27, 2020, 02:14:28 am »


Unfortunately the corner trims have not been available for a long while, and I have only ever seen one other Murena with them still fitted.

Roy

Thanks for the picture, Roy.  I have been unhappy at the appearance of my trim join, so the picture inspired me to try to find a solution.  I bought, on eBay, a small sheet of thermoplastic called Worbla and made a rough mould by glueing a couple of pieces of spare trim on to a metal plate which was cut to mimic the angle of the windscreen edges.  I first moulded the Worbla to the approximate shape using my rough mould (I did this step because I was worried about applying too much heat from a heat gun near my paint and screen).  I then took this piece and fettled it until it was a close fit and then applied a gentle bit of heat to make it conform to the shape.
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Ron Murrell
Sydney, Australia
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