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On 3 May 2004 at 23:53, Dave Hall wrote: > VW Workshop bulletin M-5 August 1969 for Types 1, 2, 3, and industrial engines > 122, 124A and 126A states:- > "If oil is lost via the crankcase breather, first check whether the cylinder > head cover gasket is properly located, as tests have shown the following: > > Increased pressure in the crankcase causes oil to be forced out of the crankcase > breather on some engines. The cause of the increase in pressure can be due to > gaskets that slipped. I wonder if this could be because of the way the opposed pistons always move in opposite directions and that the main bearing webs divide the case into 3 chambers. There is space above the webs, but maybe that's not enough to keep things on an even keel. This might mean that the pressures/vacuums built up in there might not even out and there might be some net pumping. But if that's the case, why don't the 72-3 engine have this problem, even though they have vents in the rocker boxes? -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org