Rain Water Ingress - I'm out of ideas

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Bumpa
Joined: Fri 23 Jun, 2017 21:31
Posts: 13

  Z3 roadster 2.2i

Rain Water Ingress - I'm out of ideas

Post by Bumpa » Tue 05 Dec, 2017 12:27

My Z3 has now been out of action for over a month while first the lateral acceleration sensor was replaced, then while I stripped the interior to try and dry it out, and now while I try to prevent the rain getting in again.
I have successfully sealed the rubber plug at the top of the screen post, and have made a new waterproof membrane for the door, which was sorely needed.

But I just can't prevent rain from coming in along the front edge of the quarter window. The rubber down the screen seems to be in excellent condition and I have treated it with Gummi Pflege as recommended here. The triangular glass presses on the seal in two places as shown on my photos. The rain gets past the first outer seal even though the glass is definitely pressing on it, but obviously not hard enough. From there the water tracks down and runs down the inner front edge of the door, spills over the bottom rubber, down the inner sill and forms a puddle on the floor.

I have no clue what to do. I have tried adjusting the angle of the glass so that it presses more firmly on the screen rubber and it is now at the maximum position. Still the water comes in. I can't put the interior back together again because the whole wretched scenario will just repeat and the foam underlay will become saturated eventually causing failure of the sensors.

I can't be the only person who has had this problem. It has completely ruined my enjoyment of this otherwise great car. Please help me fix it. I'm desperate!

I have tried to attach photos but I'm told that the board attachment quota has been reached ??????

mrscalex
Joined: Fri 13 Mar, 2015 09:14
Posts: 803

  Z3 roadster 1.9

Re: Rain Water Ingress - I'm out of ideas

Post by mrscalex » Tue 05 Dec, 2017 12:54

Have you loosened the quarter glass bolts, pulled the quarter glass in towards the car and tightened it under tension? That's how I solved my issue in that location.

Are you 100% sure it's coming from there?

Have you definitely sealed the door membrane correctly, with butyl tape?

Are there any holes in your lower door aperture seal?
ImageImage
1999 Z3 1.9 Boston Green (Dimitri) - My brother's car owned from new and restored by me
2001 Z3 2.2 Topaz Blue (Trudy) - My car rebuilt from a write-off
2002 Z3 2.2 Titan Silver (Okus) - Project car waiting for a new engine
2001 Z3 2.2 Topaz Blue (Debra) - Donor car/breaker
1998 Z3 1.9 Boston Green (Allsworth) - Donor car/breaker now gone to Z3 heaven
Always happy to try and help with spares :)

Bumpa
Joined: Fri 23 Jun, 2017 21:31
Posts: 13

  Z3 roadster 2.2i

Re: Rain Water Ingress - I'm out of ideas

Post by Bumpa » Tue 05 Dec, 2017 13:53

Thanks for your reply.

Have you loosened the quarter glass bolts, pulled the quarter glass in towards the car and tightened it under tension? That's how I solved my issue in that location. WHERE ARE THE BOLTS YOU REFER TO?

Are you 100% sure it's coming from there? YES. I HAVE BEEN SPRAYING THE CAR WITH A GENTLE HOSEPIPE SPRINKLER AND I CAN SEE IT GETTING PAST THE SEAL.

Have you definitely sealed the door membrane correctly, with butyl tape? I HAVE USED A PLASTIC SHEET SEALED AT THE BOTTOM AND HALF WAY UPTHE SIDES WITH SILICON SEALER. AT THE TOP I HAVE USED A STRIP OF TAPE TO SUPPORT IT. NO WATER GETS PAST THERE NOW. CERTAINLY WATER POURED IN BEFORE, AS THE ORIGINAL FOAM SHEET WAS DAMAGED

Are there any holes in your lower door aperture seal? YES THERE ARE A FEW SMALL HOLES BUT IT'S HARD TO SEE WHAT THEY CAN DO. THE WATER IS ALREADY INSIDE THE DOOR AS IT IS COMING FROM THE TOP.

By the way, why can't I post a picture?

mrscalex
Joined: Fri 13 Mar, 2015 09:14
Posts: 803

  Z3 roadster 1.9

Re: Rain Water Ingress - I'm out of ideas

Post by mrscalex » Tue 05 Dec, 2017 14:26

There are 3 bolts securing the quarter glass. 2 at the top and 1 at the bottom. Can’t remember which definitely need loosening so do them all, just slacken so theres movement then relighted while pulling in towards the car.

A split in the lower door aperture seal could let water in as it’s running off/out of the door. It was one of the issues I had to fix. Gaffer tape would do for now.
ImageImage
1999 Z3 1.9 Boston Green (Dimitri) - My brother's car owned from new and restored by me
2001 Z3 2.2 Topaz Blue (Trudy) - My car rebuilt from a write-off
2002 Z3 2.2 Titan Silver (Okus) - Project car waiting for a new engine
2001 Z3 2.2 Topaz Blue (Debra) - Donor car/breaker
1998 Z3 1.9 Boston Green (Allsworth) - Donor car/breaker now gone to Z3 heaven
Always happy to try and help with spares :)

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Gazza
Site Admin
Joined: Tue 04 Oct, 2005 21:58
Posts: 9200

  M roadster S54
Location: East London/Essex

Re: Rain Water Ingress - I'm out of ideas

Post by Gazza » Tue 05 Dec, 2017 19:20

Pictures need to be hosted off site, Flickr or Google pics etc.
Gazza

"Understeer is when you hit the wall with the front of the car, oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall and torque is how far you take the wall with you"

S54 M roadster Image, BMW Z1, BMW M3 CSL, Mustang Fastback

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Emek
Joined: Sun 31 Dec, 2006 18:45
Posts: 385

  M roadster S50
Location: Wroclaw

Re: Rain Water Ingress - I'm out of ideas

Post by Emek » Fri 08 Dec, 2017 12:00

Hi, Did you done all like on this link?
https://www.justanswer.com/bmw/29d1d-96 ... -seal.html

Bumpa
Joined: Fri 23 Jun, 2017 21:31
Posts: 13

  Z3 roadster 2.2i

Re: Rain Water Ingress - I'm out of ideas

Post by Bumpa » Fri 08 Dec, 2017 22:11

Thanks for that Emek. I will check that window adjustment procedure. The rain definitely gets past the seal where the fixed glass meets the windscreen frame. So far nothing I have tried has cured it, but it is cold here now and the car has a top cover on to keep the rain out. Once the weather changes I will have another look at it. Here on the west Scottish coast the weather changes often!

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