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  #1  
Old 10-16-2008, 09:54 PM
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Join Date: Jul 2006
Location: far n.w. wisconsin
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300d front glass leak, 1983

the poor windshiled guy. he has installed the glass with the new rubber twice and the damn thing still leaks. im ticked off, he;;s at his wits end.

how much black goop is required to get these things to quit dripping on my feet ? i can see in the lower corner of the windshield that the water is running from outside to inside. . . . . .

any special suggestions ?

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Old 10-17-2008, 10:12 AM
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I don't know, but I had windshields in my 1979 300SD installed by 3 different installers--several times each! None of them could get it to not leak, even though I paid for the $140 OEM seal (which they ripped up every time). I finally bought some of the black sealant and sealed all the gaps myself. I think what happens is they try to rush it and then they have to go back and try to correct their mistakes. It seems like they never get enough of the old seal and sealant off of the body, so the new seal won't seat. They really like to stretch those corners, too.
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Old 10-17-2008, 11:54 AM
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Its a poor design -- the gasket forms an inverted siphon around the edge of the glass. If there's any path for water to get between the windshield and gasket, it will always drain inside the cabin -- by design.

You don't need much silicone at all to stop the leak, but you probably do want to cover the entire preimiter of the windshield. On the outside of the windshield, clean the edge of the glass and gasket with denatured alcohol, then dry it thoroughly. Silicone won't stick to any oils or to any water. The alcohol removes the oils, but leaves a film of water. Once thoroughly dry, run a small bead of silicone around that joint, bridging between the glass and the edge of the gasket. You can make it is big and gloppy or as small and unobtrusive as you want -- mine is practically a film in places and therefore practically unnoticable yet still provides a seal. Let me know (PM) if you want pictures and I'll post some.. unfortunately, I don't remember taking any in-process pictures since it was such a simple task.

I suspect that if you cleaned the edge of the glass and mating groove of the gasket of all oils and dust when installing, so that there is absolutely perfect contact between the two, it would probably seal without the silicone. I'll test that theory someday when I have to replace my windshield.

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