Windshield Crack
#22
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Location: PHX some of the time
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#23
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Norri, don't you think that's just a safety thing?
I've had a look at a number of windscreen repair websites and they mention 'stress cracking'
Stress Crack: A crack that occurs without anything hitting the windshield, typically due to a large variation in the temperature (such as when the car is sitting in the sun, and then you start it and use the air conditioning). It almost always starts at the edge of the windshield. Stress cracks will normally be a straight (or slightly bending) line, and will not have any sign of impact. A "pen test" is often used to determine if there is a stress crack -- a ballpoint pen is run along the crack, and if it dips anywhere, it is not a stress crack. That is because with a stress crack, no glass =actually comes off the windshield.
but nothing about jacking being a cause.
I've had a look at a number of windscreen repair websites and they mention 'stress cracking'
Stress Crack: A crack that occurs without anything hitting the windshield, typically due to a large variation in the temperature (such as when the car is sitting in the sun, and then you start it and use the air conditioning). It almost always starts at the edge of the windshield. Stress cracks will normally be a straight (or slightly bending) line, and will not have any sign of impact. A "pen test" is often used to determine if there is a stress crack -- a ballpoint pen is run along the crack, and if it dips anywhere, it is not a stress crack. That is because with a stress crack, no glass =actually comes off the windshield.
but nothing about jacking being a cause.
#24
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#25
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To deform permanently a structure like the chassis you have to exceed the elastic limit of the elements.
I can (sort of) imagine that the elastic deformation might cause a door to jam while the car was on the jack but going into plastic (irreversible) deformation involves forces beyond anything that could be applied via a jack on one wheel.
I can (sort of) imagine that the elastic deformation might cause a door to jam while the car was on the jack but going into plastic (irreversible) deformation involves forces beyond anything that could be applied via a jack on one wheel.
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