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From: "sboese" <sboese@uwyo.edu>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Apex seal wear
Date: Wed, 3 Aug 2005 15:03:32 -0600
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Finn,

Thank you for responding to my question.  The wear measurements I make
indicate things are within specs.  I have decided to proceed with the
installation of an overhaul kit with new seals and am comfortable with =
that
decision thanks to your input.

Steve


-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Finn Lassen
Sent: Monday, August 01, 2005 8:07 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Apex seal wear

It may take quite a while for "Tracy's" new seals to wear in. They wear=20
slower than the stock seals.
However, your wear looks quite minimal. How is the wear on the sides of=20
the seals (where they wear against the rotor groove), and how worn down=20
are they? If they are well within specs you might consider reusing them.

The only disadvantage of using new seals is it may take a while (100s of =

hours?) to get perfect compression.
Mine is slowly, slowly improving, but then I had rather deep grooves in=20
the rotor housing edges (maybe 1/16" by 1/32").

Finn

sboese wrote:

>List members,
>
>I tore down my running 1986 NA 13B to check for wear as part of the =
final
>assembly of my RV-6A.  A picture of two apex seals is attached.  The =
total
>clearance between the apex seals with the ends touching is 0.006", =
0.003"
>from each seal.  This is typical of all the apex seals.  The rotor =
housings
>appear to be worn on the edges to match the end portions of the apex =
seals
>and this is the only apparent wear to be seen on them.  Is this a =
normal
>wear pattern?  Will new seals (Tracy's new seals in particular) seat to =
the
>rotor housings?
>
>Thanks for any advice you may give.
>
>Steve Boese
>RV6A, 86NA13B, EC2, RD1A, Wyoming
>
> =20
>


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