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Re: Freeing rusted parts Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 10 Oct 2002 08:46:43
In Reply to: Freeing rusted parts, Todd inMA, Wed, 9 Oct 2002 13:13:46 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I've had good luck with Liquid Wrench. I've not tried PB. As to Coke, all that's going on there is the phosphoric acid in the Coke attacks the rust. But the rust on the outside isn't what's holding the bolt in; it's the surface welding of the threads deep inside. For that, penetrating fluids (Liquid Wrench, PB) work best.
What it really takes is patience. There is no miracle squirt on/unscrew the offending bolt. I use time, heat, and vibration. Rapping the part with a hammer after squirting it helps break loose the tightly mated surfaces, and lets the penetrating oil penetrate further into the piece.
When I go to do a suspension or exhaust, I squirt the parts first thing in the morning, then drive to work (yes, it stinks). After I get home, I squirt it again. I squirt it again before bed. I do this for a few days before I get to actually doing the work. If you've already disassembled the car, squirt, rap with a hammer, squirt again, go inside for a while, repeat. You don't have to whang hard; even little taps work.
Heat is very useful. It creates differential thermal expansion which gets those frozen parts moving against one another. But you have to be VERY careful with heat. I noticed a comment about MAPP gas. That burns very hot. There are two problems with heat - first, you have to be careful what you're connected to. Rubber, plastic, electrical wires, gas lines, all don't like being overheated. Second, heat can destroy the temper of steel. This can be a particular problem with load bearing items, like suspension parts. If you're just trying to get the parts apart before tossing them, fine. But heat can destroy a part you want to reuse, and because MAPP gas is very hot, can destroy temper even faster.
I will use heat, but I carefully heat up the part a little. No glowing red, not unless I intend on replacing that part. I'm always careful about what the parts are attached to. And I ALWAYS keep a charged fire extinquisher around. A buddy of mine was removing a stuck bolt once and burned down the garage and part of the house. Not funny. He could have kept it controlled if he had a fire extinguisher handy.
posted by 192.249....
, Thu, 10 Oct 2002 08:46:43 <-- Viewing This Message, Wed, 9 Oct 2002 15:29:21, Fri, 19 Oct 2007 15:32:06
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