Rusted broken body mount bolts and cage nuts 67 ss convertible - Chevelle Tech
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post #1 of 11 (permalink) Old Sep 9th, 19, 11:22 AM Thread Starter
Avery
 
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Rusted broken body mount bolts and cage nuts 67 ss convertible

Hello all, so i looked all over and i found the info i needed to do the body mounts on my chevelle here. only thing i didnt find was pics, so i thought id post some. i used a 3 inch hole saw, my convertible has a couple of extra mounts
but at least you can see whats going on. hope this helps someone
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post #2 of 11 (permalink) Old Sep 9th, 19, 11:39 AM
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Ole
 
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Re: Rusted broken body mount bolts and cage nuts 67 ss convertible

Sometimes, if you live right, you may be able to unscrew the frame-to-body bolts after generous application of solvent to the threads from above. More likely, you will twist the cage and pull out the spot welds holding the cage to the frame.
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post #3 of 11 (permalink) Old Sep 9th, 19, 11:55 AM
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Jared
 
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Re: Rusted broken body mount bolts and cage nuts 67 ss convertible

Nice pics, I wish I did the hole saw method rather than just cutting out with a grinder. Still works out in the end but probably would have saved some time.

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post #4 of 11 (permalink) Old Sep 9th, 19, 7:36 PM
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Re: Rusted broken body mount bolts and cage nuts 67 ss convertible

i guess i lucked out on my 66 as i only had 1 bolt that broke,the one next to the drivers seat.i cut out 3 sides of a square with a cutoff wheel and bent it up on the 4th to get to it.i got a vise grip and heated the tip of the bolt and eventually got it to move took about an hour of heat and cool cycles but the bolt screwed out the top.
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post #5 of 11 (permalink) Old Sep 9th, 19, 11:01 PM
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Ole
 
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Re: Rusted broken body mount bolts and cage nuts 67 ss convertible

I've also rounded the corners of the square nut off in the cage, distorting the cage and allowing the nut to spin freely inside of it. Grrrrr.
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post #6 of 11 (permalink) Old Oct 8th, 19, 10:01 PM
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Re: Rusted broken body mount bolts and cage nuts 67 ss convertible

You're right. No pictures or video of this that I could find. I'm getting ready to replace my body mounts and hardware. I like the hole saw method. And of course, all my cage nuts are broke loose.
I would like to see pics of the finished product before you welded the metal back in place.
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post #7 of 11 (permalink) Old Oct 8th, 19, 10:31 PM
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Eric
 
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Re: Rusted broken body mount bolts and cage nuts 67 ss convertible

Mine is a story of luck, just plain living right, or possibly having my jaw in the right place because all of my body bolts unscrewed and only had to replace 3 that were rusted badly. There are some success stories in doing this job in under 2 hours.
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post #8 of 11 (permalink) Old Oct 8th, 19, 10:58 PM
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Re: Rusted broken body mount bolts and cage nuts 67 ss convertible

When you put the new bolts back in make sure to use some anti-seize on the the threads so the next time YOU or the NEXT owner has to remove them they come out again, easily this time.
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post #9 of 11 (permalink) Old Mar 21st, 20, 12:10 PM
Grant
 
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Re: Rusted broken body mount bolts and cage nuts 67 ss convertible

Here are a few more pictures of the locations of the rusted out body mount cage nuts. I used a 1 3/4 hole saw which I think is a little small but was able to get to the nut with vise grips. The cage around the bar nut was barely there. You might have to hack at the cage to get to the nut.
Locations from front to back are #1 front bumper easy to get to, #2 front floor pan where the pan bends up next to threshold see pic, 3 along threshold floor pan rail, 4 no bolt, 5 back side of rear seat floor pan, 6,7 inside trunk, 8 rear bumper. I had 3 rusted frozen, the worst ones were location #7 in trunk next to wheel well (see pic). With these I had to grind off the washer from the under the car then Dremel grind the bolt🥵.
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post #10 of 11 (permalink) Old Mar 21st, 20, 12:40 PM
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Re: Rusted broken body mount bolts and cage nuts 67 ss convertible

The reason you don't see videos on removing frozen bolts from caged nuts is due to all the cursing.
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post #11 of 11 (permalink) Old Mar 31st, 20, 6:30 PM
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Re: Rusted broken body mount bolts and cage nuts 67 ss convertible

I cut or ground all of the bolts even with the top of the nut on my 66 after coating the area with PB Blaster. That way you are not trying to unscre rusted threads through the nut. Took vice grips on the nuts in a couple places, but all unscrewed.

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