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On Sat, 2006-05-06 at 10:48, Jim Adney wrote: > On 6 May 2006 at 2:48, Russ Wolfe wrote: > > > You are correct, they are to scrape oil into the exhaust valve guids. VW > > started putting them on when they atarted having problems with exhaust > > valve guide wear. > > I have no real proof of which way they are meant to work, but I can > point out that in other engines quite elaborate valve stem seals are > used to assure that oil is kept OUT of the valve guide. > > My impression was that oil in the guides, especially the exhaust > guides, tended to get cooked and turned to coke in there. This made > them get sticky or seize up. I thought the valve stem/valve guide > problem that VW had was eventually solved thru metallurgy. > Nope, VW put those in there to get the oil worked towards the guides. I have never seen a VW exhaust valve stuck. In fact, I have never seen andy VW valve stuck. VW is one of the few engines in the world that have their valve at the highest point in the engine. And they are inclined upwards from there. This is why VW has nevr really needed valve "Seals" such as other engines use. -- 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~