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On 3 Jul 2006 at 22:28, Scott Taylor wrote: > On Jul 3, 2006, at 8:32 PM, Jim Adney wrote: > > > One thing in your photo strikes me as strange: It looks like > > there's a "step" in the cylinder head where the cylinder seats. Did > > these cylinders use a sealing ring there like the 36 hp heads, or > > have these heads been cut afterwards (or were they cut this way at > > the factory?) > > I don't know, but there is a cutaway view of an early engine in the '61 > Workshop Manual that appears to show the same step: > > http://home.earthlink.net/~scottbtaylor/cutaway.jpg Nice drawing, but the step I was referring to isn't shown there. I was commenting on the step that the cylinder actually seals against. It looks almost exactly like the step that VW introduced in '71 or '72 to reduce the compression ratio. Before that, the sealing plane was straight across. Now that I look at your earlier photos more carefully, I suspect that the thing I see really isn't a step at all, but rather just a clean area where the cylinder was seated, and maybe a slight depression from the seating. > There wasn't a seal there when I removed the head. Judging from Dave Hall's comment, I gather that the seal I've heard about, but never seen, was actually outside the combustion chamber, in the outer step that we can see in the photo and the drawing. I recently acquired a small collection of old VW parts that included a box of copper rings that I thought were those seals. Were they used on early 40 hp engines, or just on the 36? Anyone need some? I also got a BUNCH of float bowl gaskets which probably only fit 36 or 40 hp carbs. Anyone need some of those? -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~