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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1816135@logan.com>
Subject: Re: [FlyRotary] Re: Engine Rebuild
Date: Tue, 6 Feb 2007 18:05:23 -0500
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I understand that you can, George.  Unfortunately, they (by themselves) 
don't help the "V" slot situation.  You would have to machine the slot 
oversize to get the walls vertical again.  If I were going to do that I 
would probably go with 3 mm apex seals as they are readily available.

But, since I have new rotors- they hopefully will last a bit longer than the 
160 hours I got out of the used set.

Ed
----- Original Message ----- 
From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, February 06, 2007 4:52 PM
Subject: [FlyRotary] Re: Engine Rebuild


> Ed,
> I didn't know this before but apparently you an get over sized apex seals, 
> I forget the increments.
> George ( down under)
>
>> 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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>
>
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