[DeTomaso] Rear Window Cracked.....again

[michael frazier]

I’ve replaced a couple of rear windows over the years with glass and plastic units.

None were badly cracked but just had stars, probably from a misguided ratchet or

some other tool.  I’m looking at the pinch weld area of 6643 right now.  It’s double

walled and a little wavy but it’s hard to imagine it being so out of shape that it would

cause a hot spot / pressure point severe enough to break the glass through the gasket.

I’d still put a straight edge on it and flatten it out as well as I could.  I doubt body flex

caused it since the glass and gasket actually float a bit in the opening…unless you’re

using some kind of rigid adhesives...then all bets are off.  They should go in quite easily

if sized correctly.   I gave Mike Drew a tracing of a late model window some time ago FWIW.



Michael Frazier



From: Rob Dumoulin<mailto:rob at dumoulins.net>
Sent: Monday, July 25, 2016 8:08 PM
To: Matt Wells<mailto:nwpantera at gmail.com>
Cc: Pantera Mail List<mailto:detomaso at server.detomasolist.com>
Subject: Re: [DeTomaso] Rear Window Cracked.....again



I did not think that the glass was adding structural integrity, but instead
thought somehow that the car being on stands two weeks, which may have been
closer to three weeks, tweaked the opening just enough that it the glass
were a little off it might have been snug on install then cracked during
driving.

I did not inspect the glass prior to install and was not able to be there
when it was done, but my glass guy is a stand up talented guy and will redo
it for free. I plan to pass any advice from you guys to him.

You are correct that the 5 point harness bar is installed, and it was not
installed when the first glass was put in. However, the bar is a perfect
fit and has no extra pressure added to make the bolts thread. If anything,
I would think it would add support.

On Jul 25, 2016 5:40 PM, "Matt" <nwpantera at gmail.com> wrote:

> "Is it possible that the car being on jack stands could have tweaked the
> car enough to cause
>    the glass to bind as it re-tweaked to its natural state?"
> "Does anybody think it has anything to do with it being on jack stands
>    prior to glass entry"
>
> Rob what is probably nagging your subconsciousness is the idea that the
> rear glass is a part vital to the structural integrity of the car, and
> without it being in place the shape will change during jacking.
> I'm no engineer but that idea sounds absurd and you should eliminate it
> from your trouble shooting thought process.
> Sure they flex some, but rather the idea of an imperfection in the seating
> like Mike D. said sounds more plausible.
> Is the opening entirely straight sitting on the ground? Is there extreme
> heat near the suspect cracked areas? Was the glass properly de-burred of
> all sharp edges? Do you have a seat belt bar mounted to the firewall that
> might be preloading it?
> Just shots in the dark.
> Best of luck,
> Matt
> 3584
>
>
-------------- next part --------------
   I've replaced a couple of rear windows over the years with glass and
   plastic units.

   None were badly cracked but just had stars, probably from a misguided
   ratchet or

   some other tool.  I'm looking at the pinch weld area of 6643 right
   now.  It's double

   walled and a little wavy but it's hard to imagine it being so out of
   shape that it would

   cause a hot spot / pressure point severe enough to break the glass
   through the gasket.

   I'd still put a straight edge on it and flatten it out as well as I
   could.  I doubt body flex

   caused it since the glass and gasket actually float a bit in the
   opening...unless you're

   using some kind of rigid adhesives...then all bets are off.  They
   should go in quite easily

   if sized correctly.   I gave Mike Drew a tracing of a late model window
   some time ago FWIW.


   Michael Frazier


   From: [1]Rob Dumoulin
   Sent: Monday, July 25, 2016 8:08 PM
   To: [2]Matt Wells
   Cc: [3]Pantera Mail List
   Subject: Re: [DeTomaso] Rear Window Cracked.....again


   I did not think that the glass was adding structural integrity, but
   instead
   thought somehow that the car being on stands two weeks, which may have
   been
   closer to three weeks, tweaked the opening just enough that it the
   glass
   were a little off it might have been snug on install then cracked
   during
   driving.
   I did not inspect the glass prior to install and was not able to be
   there
   when it was done, but my glass guy is a stand up talented guy and will
   redo
   it for free. I plan to pass any advice from you guys to him.
   You are correct that the 5 point harness bar is installed, and it was
   not
   installed when the first glass was put in. However, the bar is a
   perfect
   fit and has no extra pressure added to make the bolts thread. If
   anything,
   I would think it would add support.
   On Jul 25, 2016 5:40 PM, "Matt" <nwpantera at gmail.com> wrote:
   > "Is it possible that the car being on jack stands could have tweaked
   the
   > car enough to cause
   >    the glass to bind as it re-tweaked to its natural state?"
   > "Does anybody think it has anything to do with it being on jack
   stands
   >    prior to glass entry"
   >
   > Rob what is probably nagging your subconsciousness is the idea that
   the
   > rear glass is a part vital to the structural integrity of the car,
   and
   > without it being in place the shape will change during jacking.
   > I'm no engineer but that idea sounds absurd and you should eliminate
   it
   > from your trouble shooting thought process.
   > Sure they flex some, but rather the idea of an imperfection in the
   seating
   > like Mike D. said sounds more plausible.
   > Is the opening entirely straight sitting on the ground? Is there
   extreme
   > heat near the suspect cracked areas? Was the glass properly de-burred
   of
   > all sharp edges? Do you have a seat belt bar mounted to the firewall
   that
   > might be preloading it?
   > Just shots in the dark.
   > Best of luck,
   > Matt
   > 3584
   >
   >

References

   1. mailto:rob at dumoulins.net
   2. mailto:nwpantera at gmail.com
   3. mailto:detomaso at server.detomasolist.com