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#31
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I'm a long time A&P. Back in the old days I used to hang them on a
piece of safety wire, get them red hot, then drop them in water. Worked great for me and I didn't have to go hunt some up in the stock room. Of course, for me, the acetylene torch was closer than the stock room. |
#32
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"Victor J. Osborne, Jr." wrote in message ... Thanks for saying what I was thinking. All I want to do is change/rotate the plugs (after sufficient oversight - one time) I'll buy bulk gaskets. All I need is a fire for trying to save a few bucks. Thx, {|;-) Victor J. (Jim) Osborne, Jr. If you can't heat spark plug gaskets without starting a fire maybe you should rethink changing/rotating the plugs in your aircraft. |
#33
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When they get too thin they also get too large and slop around
on the plug, giving adequate warning that they should be tossed. Some of the sparkplug-type CHT thermocouples are thinner than a gasket but the plug still threads far enough into the head. No gasket is used with the thermocouple. Dan |
#34
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IMHE, they flatten by getting larger in outside diameter and smaller
in inside diameter..... they can be a pill to get off then... depending on how far they have ridden up on the radius between the threaded portion and the flange. The thousands of copper gaskets I have changed have never shrunken in ID and stuck on the plug. Automobile plug gaskets will, but they're a hollow gasket that will reduce in ID when compressed. The coppers get chucked when they get too big on the ID, as all of them eventually do. I check every gasket before using it, as the annealing process will blister it if it gets too hot. I use a propane spitfire torch; gets really warm really quick. Annealing 100 gaskets takes maybe ten minutes. Dan |
#35
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Howdy!
In article , RST Engineering wrote: Oh, please, for the love of God, don't do this. This is how you HARDEN them, not soften them for the annealing process. Heat them red hot with a torch and let them cool in ambient air to soften them. Copper and silver (and probably many other non-ferrous metals) are annealed by quenching. You can't harden them by heat treatment. You harden them by working them. Yes, this is opposite to how you harden/soften steel. Google for "anneal copper". One site I found was http://www.key-to-metals.com/Article25.htm which seems to cover more than just annealing work-hardened copper. Now, one can fairly wonder why one would want to reuse old gaskets when they can be bought fairly inexpensively, but that is a different matter. yours, Michael -- Michael and MJ Houghton | Herveus d'Ormonde and Megan O'Donnelly | White Wolf and the Phoenix Bowie, MD, USA | Tablet and Inkle bands, and other stuff | http://www.radix.net/~herveus/wwap/ |
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