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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1815331@logan.com>
Subject: Re: [FlyRotary] Engine Rebuild
Date: Tue, 6 Feb 2007 12:11:39 -0500
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Assuming the wear seals were all new - are we certain they were?  Some 
rebuilders don't replace a wear part if it is within the manual's specs.

In any case, if you are tearing it down, I would replace all rubber seals 
such as coolant "O" rings and tension bolt seals.  I would go with Tracy's 
apex seals.  Side seals and oil "O" ring seals should still be OK as well as 
corner seals.

Be certain and check that the apex seal slot is within specs regarding wear 
or "V"ing of the slot walls.  That is what ( I am convinced)  caused my apex 
seal failure at 160 hours.  The rotors were used  that I stuck in my 91 
rebuild and was not knowledgeable enough (then)  to check for apex slot 
wear.  When I took them out after my apex seal failure, they were worn well 
out side the specs - I suspect they were near or over the specs when I 
installed them.

Let us know what you find, Joe.

Ed

----- Original Message ----- 
From: "Joe Hull" <joeh@PilgrimTech.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, February 06, 2007 11:29 AM
Subject: [FlyRotary] Engine Rebuild


Just got back from a trip to the Middle East – managed to catch a great 
little airshow in Al Ain, UAE 
(http://www.alainaerobaticshow.com/html/home.asp) while I was there – no 
rotaries however ☺.
But now – back to business…A couple of months ago I lost an apex seal 
because of a failed spark plug electrode casing (that’s the only plausible 
theory). At the time my daughter was living with us and I had no garage 
because it was full of her furniture. But now she’s gone and I’m back – so 
it’s time to rebuild.
The engine has less than 100hrs on it – (say 6000-10000 miles in car terms). 
And actually it has a lot less because Atkins rebuilt it about 30 hours ago 
because of low oil pressure - I'm just not sure whether he used all new 
seals when he did that.
Which leads me to the question - with those few hours on the engine - what 
seals does it make sense to replace?
Thanx,
Joe Hull
Redmond/Seattle WA, Cozy-Mazda Rotary 71hrs


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