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Looking for assistance on a body repair issue. There's a seam between the upper plenum/washer valley and the main body that was originally fastened by rivets. On my C3 those rivets have separated and obviously the 50 year old cement/sealant did not last long . Honestly I'm at a loss as to how to even approach correcting this. Do you drill the rivets out and try and re-do them? The interior side of that seam is covered. Self-tapping screws/bolts and nuts seems like a "bubba" repair job? I've attached pictures for reference, and a picture from the manual on where this is occurring. Zoomed out the seam runs just below the bottom edge of the windshield, then continues under the windsheild Zoomed in view, you can clearly see through the separated seam into the interior of the vehicle. View from the firewall angle in the manual, label "1" is essentially the seam showing how the rivets extend into a void space beneath the windshield frame on the interior
From that AIM drawing, it appears that those rivets were originally Pop-Rivets installed by the factory. So, that would be the correct method for repair. All you need to know is "how long" the rivets must be and "what material" [aluminum or steel] they are to be. I would guess that they were aluminum, but a magnet placed on one of the remaining rivets should tell you for sure.
The detail notes on that AIM sheet should specify the adhesive to be use, where it is used, and what rivets are to be installed. If GM part numbers are provided, you can try to Google those numbers [ie, GM part number 12345678] to see what comes up for additional info on them.
To confirm I'm reading this correctly in this AIM 1YZ37 and 1YZ67 are coupe and convertible respectively. The 330 number is a Plastisol Sealant, the 163 number is an adhesive. So me having a coupe I should be using a plastisol sealant correct?
Also, the drawing notes aren't terribly descriptive regarding either of these compounds, and it seems like "Plastisol" is not something I can go out and buy, are there alternatives? Searching on the GM part number and description don't seem to be returning many results.
Yes that's the main firewall seam , alloy pop rivets used and an original white sealer used only (1969 coupe ), when I pulled mine apart it had dried up and it crumbled into dust .
When I put it back together I used a Sikaflex sealer/adhesive , no one cares what you put down in a place no one can see , so I put the latest technology sealer in there .
If its just that section ,taking the wiper arm mount off could allow you to access the two holes for a pop rivet tool and a 90* drill to clean out the holes .
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Body Rivet Help
. Honestly I'm at a loss as to how to even approach correcting this. Do you drill the rivets out and try and re-do them? The interior side of that seam is covered. Self-tapping screws/bolts and nuts seems like a "bubba" repair job? I've attached pictures for reference, and a picture from the manual on where this is occurring.
