Re: 54 Johnson RD15A top seal (still) leaks

[Don]

I like the idea someone mentioned about pressurizing the upper crankcase and looking for bubbles in the seal area to see just where the problem is. I’m wondering if you can see the bleed hole Frank has pointed out by looking into the manifold with the carb off, this would save you the trouble of removing the intake manifold.
You could spray WD40 down from the upper bearing through that hole if you can see the hole with the carb off.
Perhaps you are not assembling the upper carbon seal correctly, but I realize there was oil trapped up there before you messed with the seal, correct?
Post some close up pictures if you can.