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>I have an old manual that explains that the copper sump stud washers should be annealed with a torch before reusing. Jim > We aircraft mechanic types anneal the copper spark plug gaskets on our birds' 2 plugs per head. New plugs come with new gaskets, but if we're doing an annual or 100 hr. inspection or anytime we do a compression check, these babies should be put back to near original condition. You guys know what kind of a harsh environment these aircooled operate in. With the temperature changes, expansion & contraction while under compression, and vibration these can get work hardened & lose their temper. Wouldn't want to lose a plug & maybe an engine just for a little 5 minute annealing. Procedure is actually kind of fun. I string them on a coat hanger & heat'em up cherry red with a nicely balanced oxy-acetylene flame. (Wouldn't want to be adding unnecessary carbon.) I hold them at that temperature for about 30 seconds before dropping them in a bucket of water. Sump washers I would think are much less punished, but with the copper annealing's probably not a bad idea if you're not replacing them. Mike 71 Square 66 343 ---------------ÿÇt-------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/