Windshield Crack

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Windshield Crack

Postby 5151 mm » Sat May 29, 2010 9:49 am

Hi guys!
I talked to a German MK 7 owner and he mentioned that he have had always trouble with his windshield, because of an about 5 inch long crack in the passenegr side lower corner of his windshields. He replaced his windshields several times with the result of having a few weeks later the same sh*t again. I have this issue in the same corner of the windshield, too! That can't be happenstance.
I am asking myself for the reason that such a crack occurs over and over again... Shock absorbers? Rust?

Did you guys ever had such a problem?
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Re: Windshield Crack

Postby artbaileyjr » Sat May 29, 2010 10:29 am

5151 mm,
I've personally owned a Mark VII for 23 years and have, over time, had 9 of them. (Currently 6) Over the years, I have had two windshields replaced. One was as a result of a severe frontal accident; One just cracked straight down the middle for no particular reason. (While I was standing nearby, as the car sat in my driveway, again, for no particular reason) :o :shock: :?

I have lived in -20F temperatures and in 115F temperatures. I am not familiar with this phenomenon.

Perhaps others have seen this, but I have never had an issue. ... It's very curious.... :?

Art
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Re: Windshield Crack

Postby HOTRODLINCOLN 7 » Sat May 29, 2010 4:55 pm

My Mark 7 has developed a crack on the passenger side of the windshield at the bottom and working it's way up.

I thought it was odd as there is no apperant reason for it stone chip etc????

How many others have this problem

HOT ROD LINCOLN MARK 7 :?:
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Postby 5151 mm » Sun May 30, 2010 7:10 am

So this is what mine looks like currently.
The yellow line shows the crack a little bit better.
Image

Art,
The guy, I talked to, said that one crack on his Mark happened while the car was sitting in the frontyard, too! No earthquake or something else, of course.

HOTRODLINCOLN MARK7,
I guess you are the third one, I know with the crack in this location.
Truly curious.
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Re: Windshield Crack

Postby 2manymarks » Sun May 30, 2010 8:23 am

Like Art, I have had a lot of these cars, but none as long as he has. I never noticed the described problem. In all, I have replaced two windshields. 8-)
As of July2017, 11 Mark[*] VII's, 3 licensed for the road:
1989 LSC Midnight/Current Red c/c (9G) mostly stock 99k.
1989 LSC Midnight/Current Red c/c (9G) 124k, stock, needs air suspension & bodywork.
1989 Light Titanium c/c (11) Bill Blass - stock. miles unk
1989 LSC Medium Sandalwood (62) Mass air+ 111k FOR SALE $900.
1986 BB (8T) stock 125k (wife'sDD)
1987 BB (4L) stock (miles unk)
1987 Base Model White (9L) 107k (2.73rear)
1984 Turbo Diesel Base model, Platinum (1Q), 131k+ FOR SALE $1000.
Parts cars: 88 LSC, 89 BB, 90 LSC - TLZ 5spd (complete conversion w/extras 4SALE)
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Re: Windshield Crack

Postby gadget73 » Sun May 30, 2010 8:44 am

My car has it's original glass at over 200k miles and it has no cracks. Many micro chips and scratches, but no cracks.

Has the car ever been in an accident? If the windshield frame is twisted, it may be putting stress on the glass and causing it to break. Frame rot or other problems that allow excessive body flexing may also do this. I'd be looking at the suspension, the K frame, and where the K frame attaches to the body of the car for issues.
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Re: Windshield Crack

Postby warwgn » Sun May 30, 2010 11:16 am

My Mark VII has 2 stone chips in the windshield, both on the passenger side. They've been there since before I bought the car 2.6 years ago, and they've never developed into cracks... even after the $3,000 crippling sinkhole mishap 2 years ago.

Like Thain's car, my windshield is also severely pitted, and at certain positions the reflections from the sun glare makes it nearly impossible to see. I've been meaning to have the windshield replaced, but just haven't had the time or money.
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Re: Windshield Crack

Postby hansa » Sun May 30, 2010 4:35 pm

5151 mm wrote:Hi guys!
I talked to a German MK 7 owner and he mentioned that he have had always trouble with his windshield, because of an about 5 inch long crack in the passenegr side lower corner of his windshields. He replaced his windshields several times with the result of having a few weeks later the same sh*t again. I have this issue in the same corner of the windshield, too! That can't be happenstance.
I am asking myself for the reason that such a crack occurs over and over again... Shock absorbers? Rust?

Did you guys ever had such a problem?

I'll think , that small metal piece have direct contact to the windshield. Earlier just changed, but no see problem areas?
Wind shield need about 2,5-7,5mm sealer between body vs. wind shield. No direct contact to body
If you have only small crack, you can ask repair from some company, who repair glas. They drill small hole the end of crack and they fill this hole.
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Re: Windshield Crack

Postby oldschool1 » Mon May 31, 2010 2:17 pm

Now that you mention it, I've seen this crack in this location before but only on 1990 - 1992 vehicles.

I would have never made the association if you Guys hadn't mentioned it here.
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Postby 5151 mm » Tue Jun 01, 2010 2:06 pm

Well, the second affected Mark, that I know, is a 1989. ;)
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Re: Windshield Crack

Postby ricardocordoba » Sat Jul 08, 2017 7:24 am

I have a crack in my windshield after the car has sat for some time. The car is in question is 1991 Lincoln Mark VII LSC. Does anyone know what brand windshield would be best for our cars so this doesn't happen again?
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Re: Windshield Crack

Postby CDW6212R » Sat Jul 08, 2017 8:09 am

There aren't really many brands and not really a problem with poor quality. The OEM windshield can be had I've seen for not much over $100, the typical shop you buy from is charging you a little over $100 for their labor, and to come to you and do it on site.

The real magic in window life is the installation. They use a very thick polyurethane to seal the glass, and a special cleaner to make a solid bond to the car. If that surface happens to not be true(bent or curved differently than the glass), then there's a greater chance of breakage later without an impact. The seal material needs to have a good thickness when cured, so the glass "floats" a good bit, instead of breaking.
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Re: Windshield Crack

Postby ricardocordoba » Tue Jul 11, 2017 12:25 am

Thank you for your response. That's good to hear that the aftermarket windshields for these cars are not poor quality. A NOS one would be alright but, the big question is was this issue corrected in the OEM windshields sold over the parts counter at the dealer the time? Anyways, the reason why I was asking about the windshield quality is that in the classic car and classic "Mopar" world there has been Chinese glass manufacturers where their product does not fit well on say a '68-70 Charger or '70-74 Challenger or it was made even thinner than the original glass in the car.
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Re: Windshield Crack

Postby robertbweltzien » Sat Jul 15, 2017 2:19 pm

IMG_0252.JPG
Same here. Crack appeared for no reason, though it's very hot out. The original owner had a boat on LI Sound so all the glass is sandblasted. It started at the rear view mirror mount. The Safelight guy said because I had previously siliconed it for leaks, he couldn't guarantee the job because of rust that's probably behind the silicone. I have to take it out, repair any rust, seal it and then have them install a new windshield. The total price is about $225. The glass is high quality. Still, what a PITA!

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Re: Windshield Crack

Postby ricardocordoba » Thu Jul 20, 2017 4:39 am

Thank you for the information. I was looking around for a windshield and came across one aftermarket on eBay. I was trying to figure a cost but, I was already figuring between at least $300 to $500 to have it replaced.
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Re: Windshield Crack

Postby oldschool1 » Thu Jul 20, 2017 7:51 pm

I haven't used SAFELITE for years.
I clicked through their website and got an instant quote for my 1984.

Your service estimate*:
$188.00
*Estimate does not include tax, disposal fee or additional service options.
Includes national lifetime warranty


This was for scheduled, drive in service.

Not bad.
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Re: Windshield Crack

Postby ricardocordoba » Thu Aug 03, 2017 10:21 pm

Thank you John and to the others whom replied. My crack started at the bottom and goes about to middle of the windshield. I'll get it addressed here very soon once I get some more time.
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Re: Windshield Crack

Postby oldschool1 » Sat Aug 05, 2017 5:27 am

You are welcome.
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Re: Windshield Crack

Postby 5151 mm » Mon Oct 09, 2017 5:02 pm

It happened again, and again!!

Image
What you see here is a cracked windshield from the summer of 2014.
Back then, the car just came out of a shop, where it got a rebuilt transmission due to an overdrive brake band failure. I believe they weren't aware of the air suspension, that needs to be turned off when lifting the car, so it wouldn't let all the air out of the bags. They must have drove the car out of the shop and over some bumps without waiting for the air suspension to fill back up completely. It sat very low in the parking lot...

Just recently, I was in another shop for general inspection. I turned the air suspension switch off by myself and stayed with the car during the whole inspection. They lifted the body at four points in about the same area like those for jack stands.
Two days later, I discovered a little crack in the windshield! Again, in the passenger's lower corner! :twisted:
Image

A long time ago, I had to drive the car with deflated air bags, because the air suspension computer had a failure and opened all solenoids, letting the air out. The road was in terrible shape and therfore the ride horribly hard, if not worse. For a wonder, I managed to get the car into a parking lot without any damage.

I start to believe that the cracks in my windshields have all been triggered by lifting the car improperly and / or due to a weak body structure, maybe caused by rust.
Right now, the crack becomes longer and longer over night.
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Re: Windshield Crack

Postby oldschool1 » Tue Oct 10, 2017 11:47 pm

Wow.

I would first inspect the area BEFORE another windshield is installed. As mentioned above, the windshield should NOT come in contact with anything but adhesive and the two or three spacers at the bottom used to hold the windshield UP until the sealant has cured.

I'm very interested in what you find when they remove the windshield. I can only guess that it's a bad spacer or body panel coming in contact with the windshield.
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Re: Windshield Crack

Postby 5151 mm » Sat Oct 28, 2017 3:21 pm

There is rust on the passenger and driver side.

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Re: Windshield Crack

Postby ricardocordoba » Sat Oct 28, 2017 8:00 pm

Hmmm...interesting. It's doesn't look bad and maybe because I've seen worse on older Mopars with a lot more holes. Looks like you could clean it up and do some minor repair. I'm still thinking the glass isn't thick enough for the application or the some material in the glass. I would say it could be the flexing of the structure but, if that was the case then older Chrysler products would have cracked windshields as the structure on say a '68-70 B-Body or '70-74 E-Body are very bad for flex especially when you jack them up under the frame rails on one side of the car. Anyways, thank you for sharing your pictures and information.
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Re: Windshield Crack

Postby CDW6212R » Sat Oct 28, 2017 8:07 pm

That rust likely caused the cracking. As John said, the glass should not contact anything but the adhesive, and the loose fitting spacers. The glass just floats there, and only forces of twisting the "A" pillars should put force on the glass. Normally there shouldn't be any force that would hurt the glass.

Rust grows anywhere it's located. If rust forms along the windshield channel, that can create pressure through the sealant and upon the glass. It looks like you are doing the right thing, attacking the rust. Clean everything away around the glass channel, and teat it properly, then sealing the surface with an epoxy primer etc. Done right, it should be great for bodywork painting over etc, which is ideal for the adhesive for the windshield.

I did that with my 93 body, when I used it to fix my 99 Explorer. It had rust along the left side and top mostly. I used Eastwood Rust Dissolver and POR15 over that, which scuffed up worked great for the glass man. I've had them come to me many times, it's usually just over $200 to install one, where I'm at. The glass is only about $100 of the cost, the labor and expensive adhesive, and doing it on location, is the rest.
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Re: Windshield Crack

Postby ricardocordoba » Sat Oct 28, 2017 11:56 pm

I still find it interesting though that the windshield would crack due to rust. These cars are different and like I've mentioned before I've seen plenty of '68-70 B-Body Mopars with very bad rust around both the back window and front window sometimes with their original glass. But, you do have a point about rust underneath the sealant. I could see a rust bubble or pocket putting pressure on the glass too but, as I said none of my B-Body Mopars I've owned in the past have done this and those cars had rusty rear window channels to the point water and rust would sit underneath the glass and in the channel. Anyways, to show what I've seen over the years here is a '68 Dodge Charger with the infamous rust issue around the rear window. It does happen on the front as well which causes these cars to rust from inside the firewall outward. I do understand what both you and John are saying as well. I just find it still a little odd but, it will interesting to see what I find on "Cosmo" when they remove the windshield.
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Re: Windshield Crack

Postby CDW6212R » Sun Oct 29, 2017 10:29 am

I like that, those were cool cars, the body shape.

I'd think serious rust along a window channel is rare, enough to create the kind of pressure to crack the glass. Before John mentioned that, my first thought was that the channel is not square.

My second thought was a question, was the car in a serious accident, which can tweak the main body. If it were my car, I'd spend some time with the glass out, measuring the channel surface. Figure out if the four surfaces are square with each other. The corners need to be on one same plane(sides perfectly flat and in the same plane as the other side).
Don
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