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On Sat, 2005-11-12 at 11:35, Jim Adney wrote: > On 12 Nov 2005 at 12:51, Dave Hall wrote: > > > Worn guides allow the valve to seat off-square, which I guess increases the > > stress on that part of the stem. Certainly that's the thinking behind valve > > heads breaking off. Is it a reasonable assumption to expect that some > > elongation might occur before fracture? > > That seems reasonable, but I'm hoping that someone will tell us that > under certain circumstances an exhaust valve can actually stretch 4-6 > mm without breaking. Personally, I doubt it. 4-6mm, NO, but a few thousandths yes. They give you a warning before they break, if you adjust your valves regularly. -- Russ Wolfe '71 FB AT '66 FB MT '64 T34 (not running) '65 T1 (not running) '05 KIA Sorento SUV russw@classicvw.org http://www.classicvw.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~