On Sun, 21 Dec 2008 22:50:10 -0500, hpeer wrote:

Well now, you've got me digging into Calder. While the text does not
specifically say to install the strainer below the water line the
diagrams, although fairly diagrammatic, surely tend to indicate that is
the way to do it.

I've never seen one installed any other way.

Since that engine is worth a lot more than a strainer, I'd ditch the
home made one and get the real thing while you are at it.