CJ cowl to windshield frame seal - JeepForum.com
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post #1 of 21 Old 06-08-2021, 05:47 PM Thread Starter
Demaggg
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CJ cowl to windshield frame seal

Today I left the Jeep out in a heavy down pour. 1st time I've done so and probably the first time its seen rain since it was restored. I figured its going to happen eventually so why not now. I expected some leakage from the soft doors and there was but it appears that there was water running down the inside of the firewall. I'm assuming its the seal between the frame and cowl. Years ago I was told by a service manager when I purchased a brand new 84 CJ7, not to fold the windshield down because the seals had a habit of leaking afterward. I don't know that this is true as I never did so. I'm getting pretty used to redoing things that the PO did during the restoration so this is not a surprise. I'm sure the current seal is from Morris or Quadratec but are there any more choices? Any tricks to doing it right? Thanks as always.


What a long strange trip its been...
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post #2 of 21 Old 06-08-2021, 05:58 PM
jeep_boy02
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I had a 77 CJ5 that I redid and the windshield leaned back too far. So much so that the PO had wooden shims in the corners ...

I ordered a new seal from 4WD and had no problems with it. I do not know where the one that was on it came from though so no advice on what not to use... other than wood shims.

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post #3 of 21 Old 06-08-2021, 06:49 PM
keith460
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Seal the front edge to the windshield frame like the factory seal was. There "was" a self adhesive seal on OEM factory seals but never the aftermarket ones. Even the wire grid to keep the cowl seal from pushing out has been eliminated on the aftermarket seals. The wire grid used to be between seal and bottom of windshield frame.


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post #4 of 21 Old 06-08-2021, 07:36 PM
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The last one I bought from Qadratech and had shipped to Indonesia. Quality American part, i thought. Got to last longer than local ones.

Well, I got it out of the box and it had a price on the side in Indonesian Rupiah. Yep, it had collected some air miles on its boomerang ride. Funny enough, it was less than half the price I paid.

It fit pretty good as well.

Just a note on replacing these things. I often change them with the windshield frame as the rust can be substantial, getting them open after years requires a lot of WD40 and patience if you do not want to break a hinge or rip it out of a rusty cowl etc.

I make sure all surfaces are repaired and squeaky clean, then apply wax to the paint. I just want to seal that paint as I have seen plenty of rust around that seal on CJs. As none have rusted again, perhaps it works but the oldest one I did that to was only 15 years ago.

The top, on to the windshield frame, is glued and then screwed. The bottom on to the cowl goes on dry.

The seal is rubber and relaxes a little under pressure. When you get it in the first time, it will bulge and look crap, wait a few days before panicking.

Get it laid out and you will think it is maybe a little short. Do not worry, rubber stretches and you want it taught. I put on the glue first and then screw the centre, working out to the end screws and then the intermediates. this will get it in a good alignment.

The glue is often confused with sealant. From the factory it was glue. As keith460 shows, you could use a double sided tape. If your paint is super smooth and the seal is super smooth, there is nothing for a sealant to do.

If you want a sealant then RTV is probably not the best idea, it hardens and that windshield moves. Permatex Ultra Rubber Gasket Sealant & Dressing is non setting, will allow you to position the seal on assembly and conditions the rubber.

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post #5 of 21 Old 06-08-2021, 07:47 PM Thread Starter
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What kind of tape is that? Could 3M stuff that's used for moldings be used? I have seen some that's pretty thin.
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post #6 of 21 Old 06-08-2021, 08:06 PM
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This seller on Ebay has been selling the cowl seals for years. That's what I used and it's held up well although I don't fold down my windsheld.

https://www.ebay.com/itm/361297103001
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post #7 of 21 Old 06-09-2021, 07:52 AM
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Quote:
Originally Posted by keith460 View Post
Seal the front edge to the windshield frame like the factory seal was. There "was" a self adhesive seal on OEM factory seals but never the aftermarket ones. Even the wire grid to keep the cowl seal from pushing out has been eliminated on the aftermarket seals. The wire grid used to be between seal and bottom of windshield frame.
Keith, what is the item number of that 3M tape you used there? I like that because it is so thin. I purchased a roll of butyl tape, but it is so thick that it's going to mess with the fitment of the seal against the windshield frame.

Rob
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post #8 of 21 Old 06-09-2021, 09:02 AM
InjectedCJ7
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Cowl seal leak

Demaggg,
I have some very recent experience with my CJ7 that may help you. I had a serious leak in the windshield/cowl/frame area, and it came from multiple issues. Here is the link to my reply on a similar thread,

https://www.jeepforum.com/forum/f8/w...l#post41280885

Iím sure your issues will be different, since I have a fiberglass tub with a YJ (I think) windshield frame (all from previous owner). The main improvement I got was putting the closed cell foam on the cowl surface, which helped ensure a tight compression of the seal. After I did this and tested in the next rain, I discovered that water was getting around the glass seal and dripping down the windshield frame. I sealed around the entire rubber seal with Permatex glass sealer, and the next drive, in a downpour, was almost completely dry. I traced the only remaining leak to a very slow drip at the wiper shaft hole. Turns out there were no gaskets here at all. I made a couple of gaskets and put them in yesterday. My next test drive will be soon, as rain is in the forecast. Hopefully, Iíve got it fixed! Iím also interested in Keithís reply on the tape. I plan to do that as well, even though I donít think any water is leaking in this area. Good luck!

John
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post #9 of 21 Old 06-09-2021, 11:53 AM Thread Starter
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The tape I found in my tool box is marked Scotch 35 Extreme mounting tape Its an inch wide and .400 thick ,its sticky as [email protected] It looks pretty much like the stuff I have left over from reinstalling some body side moldings marked 3M and a hair thicker. I just bought a seal from American Performance products. They list country of origin as USA (seeing is believing) $38 plus shipping. Would love to know what tape Keith460 is using. Thanks for the help!

What a long strange trip its been...
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post #10 of 21 Old 06-09-2021, 03:34 PM
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Quote:
Originally Posted by robblue6412 View Post
Keith, what is the item number of that 3M tape you used there? I like that because it is so thin. I purchased a roll of butyl tape, but it is so thick that it's going to mess with the fitment of the seal against the windshield frame.

I don't remember what I'm using now as it has been years since putting it on. But I can tell you the first tape I used, the one in the above photo, was thin poster tape and it did not hold up well over a short period of time. It lost its tackiness and the seal pulled away.


I know the new tape I'm using I might have bought from Amazon and I have some spare at home but currently away on business so can't give you details or part numbers for it. I looked through my Amazon purchasing history and came up empty. Maybe I got it from NAPA, don't know offhand.

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post #11 of 21 Old 06-09-2021, 03:39 PM
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Quote:
Originally Posted by Demaggg View Post
What kind of tape is that? Could 3M stuff that's used for moldings be used? I have seen some that's pretty thin.

That's the type I'm using and is a good choice.

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post #12 of 21 Old 06-09-2021, 06:34 PM
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Mine used to leak. I bought generic thick window seal from walmart, and placed under the cowl seal. Hasnt leaked in 10 years now.

I also ran a thin window seal all around the door on my Meyer Top. Seals air-tight. No draft, and I can drive all winter rather toasty
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post #13 of 21 Old 06-10-2021, 09:10 AM
robblue6412
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This looks like it may work well. Going to order it up, see how it goes on, and report back.

https://www.amazon.com/3M-03609-Scot...927541277&th=1

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post #14 of 21 Old 06-10-2021, 12:34 PM
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When I had to repair my damaged wiper linkage I bought replacement linkage. It came with leather gaskets for each WW arm shaft, so I used them, and they donít leak.

As far as my cowl to windshield frame seal goes, mine is old and probably the original OEM seal. Until I pull my tub for repaint, I just used a piece of black Gorilla tape, and it hasnít leaked a drop.

Iím not saying it is for everyone, but for my current situation it works fine.
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post #15 of 21 Old 06-16-2021, 06:36 AM
robblue6412
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Purchased the 3M "super strength" moulding tape from Amazon and it didn't do as well as I hoped. It sticks great to the steel, but doesn't want much to do with the rubber seal. I'm going to roll with it for a little while and tackle some more important tasks on the never-ending CJ project. Heck, maybe after sitting in a warm garage for a couple days, it will decide to stick to the seal a little more.
If anyone comes up with a two-sided tape that works better, I'm all ears
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