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From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1816256@logan.com>
Subject: Re: [FlyRotary] Re: Engine Rebuild
Date: Wed, 7 Feb 2007 16:46:36 +1000
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Ed,
Agreed - just thought I'd pass it on.
George ( down under)

>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
>>>
>>>
>>>
>>>
>>> --
>>> Homepage:  http://www.flyrotary.com/
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>>>
>>> --
>>> Homepage:  http://www.flyrotary.com/
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>>
>>
>> --
>> 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/