Mailing List flyrotary@lancaironline.net Message #59612
From: Kelly Troyer <keltro@gmail.com>
Subject: Re: [FlyRotary] Re: That damn O-ring again!
Date: Sun, 17 Feb 2013 11:27:27 -0600
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
   Mark,

     That can work but you have to be very careful when threading the side hsg for a 
fitting as the hsg is thin on one side and restricts what size fitting you can use.....I
felt that using this method added a restriction after going to the trouble of drilling the
the passage to the oil pump slightly larger..........Also is using this method be sure 
to use a straight thread fitting with "O" ring (AN) or flat sealing washer (Metric)  as
a tapered thread fitting (Pipe Thread) will crack the side hsg  on the thin (weak side)
of the hole...........FWIW

Kelly Troyer

On Sun, Feb 17, 2013 at 10:53 AM, Mark Steitle <msteitle@gmail.com> wrote:
Just to add what Todd said, you can drill the center of the brass plug, tap to say 10-32, and then use a slide-hammer to pull the plug from the galley.  Finally, tap the new outlet for an AN fitting.  You'll still need to deal with the front cover o-ring though.  If you simply block it off, the OMP won't get oil.    

Mark S.

On Sun, Feb 17, 2013 at 10:44 AM, Kelly Troyer <keltro@gmail.com> wrote:


On Feb 17, 2013, at 1:33, "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

   Todd,
      I still like the way "Mistral" and others take oil from the front side hsg by drilling 
out the brass plug and slightly enlarging the passage to the oil pump then providing
an appropriate counter bore for an "O" ring.........."Mistral" had  elaborate housing that
included a oil filter and over pressure bypass back to the oil sump.........In my case I
fabricated a small aluminum block that bolts to the side hsg using existing studs and threaded holes and provides the material needed to thread for whatever oil hose fitting  
you choose to use.........I do not have a photo on this computer of the aluminum block 
that I made but am sending three photos of my side hsg jigged up in my "CCM" (cheap
Chinese mill) to counter bore for the "O" ring............FWIW 

















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