Crack in windshield

[jonkmahl]

Hey folks, I put my old windshield and windows in with all new weatherstripping about 3 weeks ago, back window first and then windshield, both pretty easy. Side windows ended up being easy once I figured out the best way to do it but after the 3 weeks of the truck just sitting while I was doing brake work and door weatherstripping and new window glass I noticed that a small crack had developed in the passenger side windshield glass. Starting at the upper outer corner about 4" long.

Now I had installed the inside windshield metal border with new screws but they point away from the glass so  dont think this was the cause. While working on the door weatherstripping I did slam the doors a few few times and used my impact gun to put the door bolts back on the driver side, rust was so bad that after taking the door hinge bolts out of the body side the door would not come off because the hinges seemed to be rusted to the body.

But I happened to glance up and saw the new crack. They are the original glass windshields and I didnt notice the crack until later.

Any idea if I just banged the wrong place or has anyone experienced anything like that? Just trying to figure out the weirdness of it.

Thanks yalll.

[JBNeal]

It's glass, one wrong move and the expletives will fly...

A few years ago, my friend slid under a concrete truck, its Mansfield bar smashed her wiper pivots all up but didn't crack the windshield...she drove it for months like that as it was a dry summer, but Labor Day weekend she "paid" me to do my magic... I slowly massaged that sheet metal back so the wipers would work, took it for a long bumpy test drive then thru a car wash, no problems...that evening as we stepped out for dinner, I spotted the crack at the bottom of the windshield, as it had been sitting in the sun for a few hours...by the time we got back from dinner for dessert, the crack was all the way across that big curved glass...the replacement glass was easy to set, so the window frame wasn't too far outta whack, and the glass hasn't cracked to this day, spending its days outdoors...so who knows how that windshield cracked, could've been a very very small crack that began to propagate after the accident or during repairs or from thermal expansion...

[jonkmahl]

Thanks JB, in the network engineer world we call it FM. Frigging Magic.

Just needed to find someone to commiserate with, ugh!

[gramps1951]

there can be a very small chip on the edge of the glass and sometimes all it needs is a change in temp or vibration or flex in window frame for a crack to run.

[Tooljunkie]

The chip on the edge, referred to as a shell, seashell shaped. The laminated glass tends to do that if edge gets bumped. The old glass is quite brittle and wont flex like new glass. Glass does flex, not much but it does. 
 

i took a good one i removed to the body shop, he sent it away and a pair of new ones came back. After tax was $130 cdn. He wanted to give it to me at cost $80, but that’s not good business, and friend or not a guy has to make a buck. 

[ggdad1951]

Did you install the internal window bezel?  I overtightened mine and cracked the glass in the upper outside corner.  Due to the seam on the cab right there.