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Date: Sun, 17 Feb 2013 04:56:36 -0600
Message-ID: <CAHh3jbMTGo5kL-b3M-gdDK3f=3DX3PY84+WNqAdc1NTNs17oKg@mail.gmail.com>
Subject: Re: [FlyRotary] That damn O-ring again!
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=00151740272a59e10404d5e97647

--00151740272a59e10404d5e97647
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Todd,

What happened to the counter-bore in the front iron?  Did your model not
have a counter-bore?  It appears to have been filled in with Devcon (or
JB)?  The walls of the counter-bore are supposed to hold the o-ring in
place and prevent it from being forced out under pressure.  At least that's
my understanding of how it works.

From the pictures, it appears that the thick-wall bushing will be choking
off much of your oil flow, possibly causing other problems (bearing
failure).

Mark S.

On Sun, Feb 17, 2013 at 1:34 AM, Todd Bartrim <bartrim@gmail.com> wrote:

> Hello All;
> It's been awhile since I last posted, though I've been reading almost
> every post to sort of keep up with the latest developments.
>     The last time I flew I was seeing lower oil pressures around 35-40
> psi, so I decided to pull the front cover the other day. I had previously
> had a complete O-ring failure so had done the recommended fix at the time.
> When I pulled it the other day, everything looked good but obviously
> wasn't. I recalled Chris having a repeat of this last fall so searched the
> archives and found a reference to him pushing a small cylinder in there.
> There was also a previous post where Lynn commented on somebody else's idea
> of a Teflon washer being a good idea. So I've decided to do both. Attached
> pics should show in better detail than I could explain. I've done a trial
> fit, but will await comments before I assemble with sealant.
>
> Todd Bartrim
>
> C-FSTB
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>

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Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Todd,=A0<div><br></div><div>What happened to the counter-bore in the front =
iron? =A0Did your model not have a counter-bore? =A0It appears to have been=
 filled in with Devcon (or JB)? =A0The walls of the counter-bore are suppos=
ed to hold the o-ring in place and prevent it from being forced out under p=
ressure. =A0At least that&#39;s my understanding of how it works. =A0</div>
<div><br></div><div>From the pictures, it appears that the thick-wall bushi=
ng will be choking off much of your oil flow, possibly causing other proble=
ms (bearing failure).</div><div><br></div><div>Mark S.<br><br><div class=3D=
"gmail_quote">
On Sun, Feb 17, 2013 at 1:34 AM, Todd Bartrim <span dir=3D"ltr">&lt;<a href=
=3D"mailto:bartrim@gmail.com" target=3D"_blank">bartrim@gmail.com</a>&gt;</=
span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8e=
x;border-left:1px #ccc solid;padding-left:1ex">
<div dir=3D"ltr"><div>Hello All;</div><div>It&#39;s been awhile since=A0I=
=A0last posted, though I&#39;ve been reading almost every post to sort of k=
eep up with the latest developments.</div><div>=A0 =A0 The last time I flew=
 I was seeing lower oil pressures around 35-40 psi, so I decided to pull th=
e front cover the other day. I had previously had a complete O-ring failure=
 so had done the recommended fix at the time. When I pulled it the other da=
y, everything looked good but obviously wasn&#39;t. I recalled Chris having=
 a repeat of this last fall so searched the archives and found a reference =
to him pushing a small cylinder in there. There was also a previous post wh=
ere Lynn commented on somebody else&#39;s idea of a Teflon washer being a g=
ood idea. So I&#39;ve decided to do both. Attached pics should show in bett=
er detail than I could explain. I&#39;ve done a trial fit, but will await c=
omments before I assemble with sealant.</div>

<div><br></div><div><div dir=3D"ltr">Todd Bartrim<br><div><br></div><div><s=
pan style=3D"font-size:small;background-color:rgb(252,252,252);font-family:=
&#39;Gill Sans&#39;,&#39;Helvetica Neue&#39;,ErieLight,Erie,&#39;Eras Mediu=
m&#39;,Verdana,Tahoma,Arial,helvetica,sans-serif">C-FSTB</span><br>

</div></div></div>
</div>
<br>--<br>
Homepage: =A0<a href=3D"http://www.flyrotary.com/" target=3D"_blank">http:/=
/www.flyrotary.com/</a><br>
Archive and UnSub: =A0 <a href=3D"http://mail.lancaironline.net:81/lists/fl=
yrotary/List.html" target=3D"_blank">http://mail.lancaironline.net:81/lists=
/flyrotary/List.html</a><br>
<br></blockquote></div><br></div>

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