Ed Anderson wrote:

Paul,
    Attached is photo of rear housing outer coolant "O" ring that fell

out

of its groove during installation of the rear housing and was cut into
several pieces.  Result was coolant leak between rear rotor housing

and

rear

side housing.  Apparently too little Hylomar or perhaps a spot of oil

in

the

groove, but it required 7 hours to fix.  Only about 20 minutes to

replace

the seal, rest of time was removing/reinstalling engine and getting to

the

engine.

Best Regards

Ed

That teflon encapsulated  silicone inner seal still looks in good shape

:-)

Perhaps it is worth biting the financial bullet and using those on the

outer seal as well.

Paul Lamar

I agree, Paul.  In fact I tried to find a Teflon coated O ring big enough

in

size and could not find any.  I found some burna? rings but they were 1/8"
thick which is too large for the outer O ring.  I will keep looking.

 Yes, the Teflon coated inner ring did not look too bad for the wear {:>).
But even the Teflon coated O rings in the old engine were in the same
condition.  So my experience is the Teflon O rings are certainly they way

to

go and getting them from McMasters at $9 and some change beats getting

them

from Hayes at $25 a pop.  If you recall from your visit, I have an 87

block

sitting in the wooden stand that I will get around to rebuilding and

intend

to use other than Mazda "O" rings where ever possible.

Ed

I got some of the teflon encapsulated  silicone outer rings from All O-rings
but they wanted much more money than McMaster Carr.

Paul Lamar

Andrew Mueller wrote:

I recently signed up to be on your mailing list for rotary conversions.  I
am a rotary rebuilder for the automotive industry and am sifting through the
200+ emails I received over the last few days.  I am responding to the
letter that was written below.

Are you aware that MAZDA will sell you a rebuild kit for rotaries...if you
know the part numbers up front?  These kits come with everything except the
front and rear main seals and oil control rings and rubbers, and do not
include any parts to rebuild the rotors or any internal springs.  What it
does have are the inner and outer water seals and ALL o-rings for the
completion of the engine, all for around &100 a kit.  If you need part
numbers for these and other pieces, let me know, I'll be happy to give them
to you.  Also, MAZDA parts are the best there are provided that, like any
other engine, yours is run within operating temps and pressures.

As for reusing the inner [stock] water seal, be very careful when removing the seal
if the engine has been fired up and heated in any way.  As you may know this
multi-layered seal will separate and if it is reused in this condition, you
may experience a water leak some time in the future.  And to ensure that the
seal lasts as long as possible, go to MAZDA and get the heat shields for the
inner seal.  These are small slivers of creased metal that are placed along
the inner edge of the seal to help deflect some of the heat generated by the
combustion possess.

I know many tricks to building these engines.  Things that you will not find
in any manual and I have little reason to keep them all to myself.

Andy Mueller
amueller@jps.net

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