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Had a stubborn bolt on a Cessna 172's exhaust flange yesterday
It was on a plane that came in from a coastal operation, so I'm guessing salt air played a part. I soaked it with penetrating oil for an hour, used a six-point socket and a breaker bar, and it still wouldn't budge without feeling like it was going to shear. What's your go-to method for a seized exhaust bolt before you bring out the heat?
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nguyen.dylan11d ago
For a seized bolt like that, I've had luck with a mix of acetone and ATF.
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averywright11d ago
Ever try heating the bolt with a torch before you hit it with the mix? @nguyen.dylan is right about the acetone and ATF, that stuff works. But on really bad ones, I get the bolt head glowing a little first, let it cool a bit, then soak it. The heat breaks the rust bond and helps the fluid get in deeper. Just did this on my truck's exhaust manifold bolts last week.
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