No doubt about it. The P-port is leaking.
I machined a sleeve out of PVC pipe 1.875 inch  diameter
and slipped it into the p-port. Sure enough the sound
stopped. Pull it out a couple of tenths and the sound
starts again.

I also found a tiny, tiny leak around the repair on the
cracked rear rotor housing. Pumping the engine water jacket
up to 50 psi with my compressor does wonders in the leak
detection department.

I borrowed a vacuum pump from my next door neighbor that
repairs HIVAC stuff. I then pulled a continuous vacuum on
the water jacket. Don't forget to take the schrader valve
out of the pressure fitting.

I cleaned around the tiny tiny leak
with a small round file and acetone and applied a little more JB Weld.
I left the vac pump sucking. Hopefully the vac pump will suck the
JB Weld into the crack. We will see tomorrow if this works.
I will pump up the water jacket to 50 psi tomorrow and
see if the tiny tiny leak is gone. This can be repeated if
necessary.

If it works I will do the same thing to the p-port leak.

By all means folks pressurize those p-ports before you assemble
the engine. Much easier to fix before the engine is all put together.

Also my neighbor loaned me some florescent soapy fluid
which is great for detecting leaks.

You might also be able to do this with a cheap hand vac
pump you can buy in auto parts stores.

Paul Lamar ...No rotor no motor.

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