Mailing List flyrotary@lancaironline.net Message #59602
From: Mark Steitle <msteitle@gmail.com>
Subject: Re: [FlyRotary] That damn O-ring again!
Date: Sun, 17 Feb 2013 04:56:36 -0600
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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

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