Rear Window Exploded
Pro
Joined: Oct 2015
Posts: 533
Likes: 15
From: NYC
Wow this is alarming..I was just about to order this for my new to me 993..There must be a logical reason as to why this is happening.
After reviewing the instructions on how this is installed I can only speculate that after the locating pins have been glued to the glass and the mounting strip has been fastened to it that it is not allowing the proper expansion and contraction of the glass up top thus causing it to shatter?
After reviewing the instructions on how this is installed I can only speculate that after the locating pins have been glued to the glass and the mounting strip has been fastened to it that it is not allowing the proper expansion and contraction of the glass up top thus causing it to shatter?
Thread Starter
Rennlist Member
Joined: Nov 2006
Posts: 2,220
Likes: 115
puzzled
Wow this is alarming..I was just about to order this for my new to me 993..There must be a logical reason as to why this is happening.
After reviewing the instructions on how this is installed I can only speculate that after the locating pins have been glued to the glass and the mounting strip has been fastened to it that it is not allowing the proper expansion and contraction of the glass up top thus causing it to shatter?
After reviewing the instructions on how this is installed I can only speculate that after the locating pins have been glued to the glass and the mounting strip has been fastened to it that it is not allowing the proper expansion and contraction of the glass up top thus causing it to shatter?
Rennlist Member
Joined: Sep 2010
Posts: 2,095
Likes: 163
From: New England
That's terrible. Maybe the heat generated from the two-part adhesive has something to do with it?
In the last twenty years there have been major advances in regards to urethane windshield bonding adhesives. You might want to consult a glass shop who specializes in this field and ask them what they would recommend for this application.
.
In the last twenty years there have been major advances in regards to urethane windshield bonding adhesives. You might want to consult a glass shop who specializes in this field and ask them what they would recommend for this application.
.
RL Community Team
Rennlist Member
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Joined: Sep 2004
Posts: 5,760
Likes: 893
From: Monterey Bay Area
That's terrible. Maybe the heat generated from the two-part adhesive has something to do with it?
In the last twenty years there have been major advances in regards to urethane windshield bonding adhesives. You might want to consult a glass shop who specializes in this field and ask them what they would recommend for this application.
.
In the last twenty years there have been major advances in regards to urethane windshield bonding adhesives. You might want to consult a glass shop who specializes in this field and ask them what they would recommend for this application.
.
I would highly recommend doing this repair in a temperature controlled environment, only using a very small amount of adhesive and letting it cure for at least 12 hours inside the temperature controlled environment. The second time my brake light was mounted it was done in this manner under the supervision of the local Porsche dealership.
Rennlist Member
Joined: Sep 2010
Posts: 2,095
Likes: 163
From: New England
You are more than likely right. Think when the factory installed them, they would have changed the process if difficulties had arisen at that time.
I still think I'd check with a knowledgeable source. There may be products today that would function as well or better than the 20 yr old application process and require less stringent parameters.
Regards,
.
I still think I'd check with a knowledgeable source. There may be products today that would function as well or better than the 20 yr old application process and require less stringent parameters.
Regards,
.
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Lifetime Rennlist
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Joined: Sep 2004
Posts: 2,068
Likes: 82
From: CA>Oklahoma!
Hi Dan,
Sorry to hear this. It's not an isolated incident, so the details in this thread about other occurrences should help convince the shop that somehow the work caused the window to break.
We're restarting our Saturday Cars & Coffee at Lift after the first of the year, so please come join us.
Best regards
Sorry to hear this. It's not an isolated incident, so the details in this thread about other occurrences should help convince the shop that somehow the work caused the window to break.
We're restarting our Saturday Cars & Coffee at Lift after the first of the year, so please come join us.
Best regards
Pro
Joined: Sep 2010
Posts: 523
Likes: 1
When the 993's first came out there were issues of rear windows exploding. They were also known for squeaking.
My rear window failed somewhere around 90,000 miles while my wife and I were driving to dinner. Never did find out why
My rear window failed somewhere around 90,000 miles while my wife and I were driving to dinner. Never did find out why
Thread Starter
Rennlist Member
Joined: Nov 2006
Posts: 2,220
Likes: 115
Mine was done at a glass shop, following the tech bulletin and using the factory recommended two part adhesive and still exploded. I really think it has to do with the temperature when the adhesive is applied, the amount of adhesive applied and the temperature the adhesive cures.
I would highly recommend doing this repair in a temperature controlled environment, only using a very small amount of adhesive and letting it cure for at least 12 hours inside the temperature controlled environment. The second time my brake light was mounted it was done in this manner under the supervision of the local Porsche dealership.
I would highly recommend doing this repair in a temperature controlled environment, only using a very small amount of adhesive and letting it cure for at least 12 hours inside the temperature controlled environment. The second time my brake light was mounted it was done in this manner under the supervision of the local Porsche dealership.
Hi Dan,
Sorry to hear this. It's not an isolated incident, so the details in this thread about other occurrences should help convince the shop that somehow the work caused the window to break.
We're restarting our Saturday Cars & Coffee at Lift after the first of the year, so please come join us.
Best regards
Sorry to hear this. It's not an isolated incident, so the details in this thread about other occurrences should help convince the shop that somehow the work caused the window to break.
We're restarting our Saturday Cars & Coffee at Lift after the first of the year, so please come join us.
Best regards
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Pro
Joined: Oct 2015
Posts: 533
Likes: 15
From: NYC
I am thinking that it may be a viable alternative to utilize some 3m mounting tape(the same kind that is used to mount factory moldings in some cars) instead of the urethane adhesive as the tape will bond to the glass quite well and still allow for the proper expansion? I remember using this for my AC Schnitzer rear window spoiler on my E90 M3 and worked fine for the 5 years that I had the car.
Thread Starter
Rennlist Member
Joined: Nov 2006
Posts: 2,220
Likes: 115
i considered leaving it off, but since i don't have a front plate...no 3rd brake light is just another violation if i'm ever stopped; not to mention the imbecile who rear ends you and claims he/she couldn't see your brake lights.
Last edited by FLYT993; Dec 30, 2015 at 03:48 PM. Reason: grammar
Racer
Joined: Nov 2003
Posts: 444
Likes: 6
From: Sydney Australia
Repressed memories now returning, my right eye is beginning to twitch again after so long, I think its time for intensive therapy again.
But this may give you some answers.
https://rennlist.com/forums/993-foru...-breaking.html
and
https://rennlist.com/forums/993-foru...an-a-year.html
But this may give you some answers.
https://rennlist.com/forums/993-foru...-breaking.html
and
https://rennlist.com/forums/993-foru...an-a-year.html
Last edited by Aussie Alan 993; Dec 31, 2015 at 06:57 AM.
Pro
Joined: Oct 2015
Posts: 533
Likes: 15
From: NYC
So from reading up further upon this phenomenon of the rear glass shattering on vehicles with the high mounted spoiler/3rd lamp it seems that part of the problem was attributed to the way that the wiring harness was connected causing the rear defroster to short out/remain on at all times?
