Ken Gillanders wrote:

Paul,
I have two engines disassembled. '74-79' 13B and '86 13B. The '74 still
needs to be lapped, also has 3mm apex seals. I'll donate one to test the
seals if you would like.Were you thinking of a ground test with the prop and
TES seals?

Ken

No need Ken we have a handle on the problem. Perry Mick and Ed Anderson are
flying TES O-rings with no trouble. Perhaps others.  In fact Perry overheated 
his engine several times with no problems with the TES O-rings. If you have an early 
set check the xsec diameter of the outer water ring and make sure it is not
more than 0.093" in cross section diameter. If you have early oil scraper
TES O-rings they are probably not the right size so don't try to use them. 

Chuck Dunlap has a complete set of new oil scrapper TES O-rings that I tested
for fit myself.  They are easy to install and un-install. They
are a special size that I ordered directly from Creavey. They were
also about one third the price of the stock Mazda oil scraper
O-rings.

Here is the pertinent message on the correct size of the oil scrapper O-rings.

Quote:
Subject:       Oil O rings. proper sizes.
   Date:        Thu, 07 Jun 2001 12:23:44 -0700
  From:        ACRE NL <rotaryeng@earthlink.net>
    CC:        Mazdatrix <mail@mazdatrix.com>

I checked the installation of the oil O-rings with the new
sizes I got from Creavey. They worked perfectly and were
very easy to install. You will need a little O-ring lube
and a 2 by 8 to install them. They were also easy to remove
with no signs of distortion.

One of the secrets is if you reuse the old oil scraper rings
they must be spotlessly clean inside and out. Soak them
in carb cleaner for a few days. If you use new scraper rings
this will not be a problem of course.
The second thing to watch out for is don't nick the 
rotor wall between the two scraper rings when you remove them.
Very very important!!

Hopefully we can talk Dave Lemon into stocking these custom size
teflon encap silicon oil O-rings. Everybody send a message to 
Dave at Mazdatrix :-) As I said these can be the same or just a 
little more than the stock oil O-rings from Mazda.

The proper sizes are:

0.093" section 4.68 inch ID 
0.118" section 4.33 inch ID 

I can vouch for the quality of the Creavey O-rings but some 
of those water TES o-rings from Mcmaster Carr I have seen 
are not as good. This is not to say they won't work. They just 
don't look as good around the joints as Creavey O-rings.

End of quote.
 


Tom Kimsey got a real early set of TES O-rings that apparently were over
size for the outer water O-ring groove.

Paul Lamar
 
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