Received-SPF: pass
 receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com
Message-ID: <001401c5a536$3d7bfcc0$2402a8c0@edward2>
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-675338@logan.com>
Subject: Re: [FlyRotary] Re: Rotary Diagnosis please
Date: Fri, 19 Aug 2005 23:21:22 -0400
MIME-Version: 1.0
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=original
Content-Transfer-Encoding: 7bit

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
>>
>>
>> --
>> Homepage: http://www.flyrotary.com/
>> Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/


--
Homepage:  http://www.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/