Re: Radiator Cap
DM. I don't know if the '40 rad cap and the '46 rad cap are comparable, but I "fixed" mine with some hi-temp black silicone seal, and planned to buy a replacement. I ran a 1/4" high bead of silicone around the existing gasket, at midpoint between the center metal disc and the outer perimeter of the gasket. I placed the cap gasket side up on the workbench, placed a piece of waxed paper over the rad cap, and placed a 1/2" x 4" x 4" piece of flat bar on top. Left it for two days to set, peeled of the wax paper, trimmed the outer edge with a knife and installed it. I ran it for one summer, before replacing, and no leaks.
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