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where to look for rust

Old 07-15-2018, 11:30 PM
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where to look for rust

hello - i'm looking at an 84 Berlinetta that appears to be rust free from the pictures, which include some close ups along the bottom of the door/rocker panel and the fenders behind the tires. My question is can you determine if the floors are rusted out by crawling underneath or is there a separate layer inside the car that requires the carpet be pulled back to check?

Thanks!
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Old 07-15-2018, 11:55 PM
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Re: where to look for rust

You should be able to get a good idea from underneath. Check under the driverís side pan, check the wheel wells and the trunk well. Check out the frame rails and the pinch weld.
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Old 07-16-2018, 09:02 AM
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Re: where to look for rust

thanks for the reply! I've read a lot of posts and see a lot of ugly pictures on here of rusted out floor pans, but i wasn't sure if it could look fine from the outside but be completely shot on the inside.

and if i could ask - what is the pinch weld?

thanks!
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Old 07-16-2018, 09:15 AM
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Re: where to look for rust

Originally Posted by galwahh View Post
thanks for the reply! I've read a lot of posts and see a lot of ugly pictures on here of rusted out floor pans, but i wasn't sure if it could look fine from the outside but be completely shot on the inside.

and if i could ask - what is the pinch weld?

thanks!
This seam is the pinch weld , and this is what it should look like on an unrusted car .

Also , a peek at the strut towers under the hood , as well as the firewall itself is good practice too . Basically look it all over real good ...
Attached Thumbnails where to look for rust-firebird17.jpg  
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Old 07-16-2018, 09:22 AM
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Re: where to look for rust

Itís possible with T-Top cars where it has rained in the car and water has sat. I woukdnít worry too much about that though. There will usually be some indication underneath unless it is just starting. You could probably smell a mildewy smell in the carpet.

The pinch weld is where the floor pan and the rocker panel meet (and are welded) under the car. It looks like a line running from front to rear on either side. People jack the car up on them, you arenít really supposed to, they get bent/scratched and provide that initial bare metal for rust to start.
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Old 07-16-2018, 09:34 AM
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Re: where to look for rust

thanks guys, great feedback! here's a shot of the lower door section
Attached Thumbnails where to look for rust-dsc09069.jpg  
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Old 07-16-2018, 10:50 AM
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Re: where to look for rust

It's a good idea if you can see in person, or get good pics of the underneath. If the seller is interested in selling, and honest, they will probably not mind getting a few pics for you.
Especially if they are asking good $$ for it.
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Old 07-16-2018, 06:52 PM
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Re: where to look for rust

Good spot to look is along the rockers near the kick panels both inside the car (remove plastic trim and pull carpet back) and on the outside behind the fender (just remove the fender liner to see). Currently (still) doing floors and that was rotten on both sides.

Check the subframe members where the trans mount bolts to. My drivers side needed to be replaced, passenger side was perfect.

Check along the BACK of the strut towers where they meet up with the firewall, debris sits there, holds water and can cause some rot.
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Old 07-17-2018, 12:01 PM
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Re: where to look for rust

thanks for the great feedback! It's also really helpful to know the terminology so i can go to youtube and see exactly what i need to check.
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