Removing the o ring block revealed sealant that had gone fairly brittle.
Crappy stuff. I suspect a little vibration
loosened something and thus the leak.
Here are some photos of the cleaned port and re seal with black RTV.
Lewis Bjork
I don't think black is the right stuff to use. Red RTV is usually
500 F.
What does it say on the container?
Also I would etch the aluminum to get a better seal.
BTW I hope you are mixing two cycle oil with the fuel and not
injecting
the crap out of the "crankcase". It looks like you are doing that
in one of the pictures or is that a sensor?
2 cycle oil in the fuel does a better job as it gets everywhere
inside the engine and not just down stream from the injector hole.
2 cycle oil burns cleanly leaving no residue unlike crankcase oil.
Paul Lamar
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Paul,
FWIW, Coolant can also find its way up the threads of the 4 bolts.
On my 20B, I had to counter-sink a couple and add button-head
screws with o-rings to finally get all the small leaks stopped.
Coolant can (will) leak at the joint of the sealing plate and the
outer rotor housing surface. This proved to be a challenge to
obtain
a leak-proof seal. I used Ultra grey RTV. Important to let it sit
24
hrs in order to fully cure before pressure testing else the
air/water
will force its way through the soft RTV and create a leak where
there
was none. Don't get in a hurry with this step.
Mark S.
Great idea. I will add that to the procedure. Jeff can do that
operation when he machines the sealing blocks. You deserve most of
the credit for the success of the welded P-port having welded the
first one.
Mcmaster Car has Teflon coated 10-32 screws that also will probably
seal.
The RX8 p-port video on you tube is now over 80,000 hits.
Paul Lamar
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These screws come with the O-ring seal.
Paul Lamar
A tapered counter bore for the seal to sit down in helps. The bolt
head then
contacts the bore at its outer diameter and does not crush the seal. A
problem with the pan head screws can be the full threads. The coolant can
then leak past the inner part of the thread. Newer Bettis hydraulic
actuators
seem to have a problem with this. A better solution is to use copper
washers.
Dale Davies
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http://www.rotaryeng.net
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Copyright 1998-2013 All world wide rights reserved.