hugo_jones•16h agoProlific Poster

Tried a trick with a heat gun on a stubborn connector and now I'm rethinking everything

Had this old D-sub connector on a nav unit that just would not come apart, the locking screws were fused solid. A guy at the hangar in Tucson said to give it a quick, gentle heat with a heat gun to break the corrosion bond. I set my heat gun to about 250 degrees and gave it a few passes... and the whole plastic housing on the connector softened and warped. Not a meltdown, but enough to make it unusable. I was so focused on the screws I didn't think about the housing material being that sensitive. Ended up having to replace the whole connector assembly, which took an extra three hours. Learned the hard way that 'gentle heat' means something very different depending on who's saying it and what plastic you're dealing with. What's your go-to method for seized connectors when you can't just cut and crimp a new one?

2 comments

2 Comments

tarajenkins14h ago

My old boss in Dayton always swore by a 50/50 mix of acetone and automatic transmission fluid for frozen screws. That stuff creeps into threads like nothing else. I let it soak for a few hours, then use a properly fitting screwdriver with a wrench on the handle for extra twist. @angela_allen53 has the right idea with patience and oil, you really can't rush it. I've also had to carefully pick out old threadlocker with a dental pick before the screw would budge. Heat is such a gamble unless you know the exact plastic type, and I usually don't.

angela_allen5315h ago

Feel your pain on the heat gun lesson. I've had good luck with a tiny drop of penetrating oil on the threads, letting it sit overnight. Sometimes a careful twist with small pliers does the trick without the melt risk.