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Jim,
The metal rings that retain the oil "O" rings have a very small range (in my opinion) operational spec. I have measured them even after 100 hours and found them to be just within the spec. I suspect that they wear quickly when seating in new side housings and then the wear factor drops way down. But, I have never taken apart an used engine and found the metal rings reusable (based on the Mazda spec for wear). Not to say they would not work - but they were not within the Mazda specs for wear.
They have a rather sharp metal ridge (actually the edge of the metal ring) that rides against the side housing (and scraps off and seals the oil in the center housing from the combustion chamber). This ridge/edge will show a bright wear mark. The width of this worn spot on the outer surface of the ring determines (according to the Mazda manual) whether the Metal "O" ring holders are within specs. Apparently when this ridge wears flat enough then there is sufficient flat surface area for the rings to hydroplane on the oil rather than scraping it off the wall (just a WAG on my part).
But, if you are burning oil, then my bet is the metal "O" ring holders.
Ed A
----- Original Message ----- From: "James Brewer" <alpha@concordnc.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, August 19, 2005 6:15 PM
Subject: [FlyRotary] Re: Rotary Diagnosis please
Yes, I replace the oil seal o-rings. Yeah, it was smoking when I got it. Very low
compression on one rotor. Replaced parts with Tracy's overhaul kit. Bearings in rotors were not
replace but looked ok and measured fine. New apex seals and side seals.
I didn't replace the metal oil rings on the rotors as they looked fine. How
critical are these anyway and what are the symptoms of failure/damage?
Jim
On Fri, 19 Aug 2005 20:49:27 +0000, Kelly Troyer wrote:
Jim,
You did replace the rotor oil seal O-rings I presume ?? Was it
smoking like that before overhaul ?? -- Kelly Troyer Dyke
Delta/13B/RD1C/EC2
-------------- Original message from James Brewer
<alpha@concordnc.com>: --------------
Guys,
I need some help on my recent 13B rebuild for my '87 RX7. Thanks
to all previous replies on the crank angle sensor/TDC
settings I was able to get it to crank and run. Now for the
diagnosis of my present problem: Engine starts and idles with a
slight
amount of smoking. As the engine warms up and I increase the RPM
I get a considerable amount of smoke. The smoke does
not smell "sweet" like it is burning coolant but maybe it smells
different in a rotary. Smoke is white not black. With limited
running
I haven't noticed a drop in the coolant or coolant in the oil.
Before I pull the engine and go thru it again I would like to
pinpoint the
problem before teardown. I thought I was careful about the o-
rings. I used Hylomar for the grooves as per Bruce Turrentine's
tape
to keep them in the grooves. Am I getting oil past the oil o-
rings? Other sources or causes for my smoke? Tests I need to run?
Help! Ed, Lynn, Leon or others.
Jim Brewer
Albemarle, NC
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