flyrotary@lancaironline.net Mailing List Archive

Well, I'm glad to see I can still get a conversation going around here.

The counter-bore recess in the front housing is still there, it just has the Teflon washer set into it in the picture. The counter-bore is recessed 0.8mm and I made the washer from Teflon gasket stock 1.4mm thick (uncompressed). It fits very tightly inside the recess so there is no room for it to move out of place. I don't plan to use the front cover gasket, just some sealant.

It's been a long time since I did the "recommended fix", so I had to find some notes on it. I believe it was from the Turrentine video and was simply omitting the cover gasket and a different O-ring. Seemed that it worked for sometime as I had good pressure until the last few flight hours.

I had forgotten to add in the original post that the ID of the bushing doesn't need to accommodate full flow as I drilled out the front iron long ago and route my oil flow through there. See attached pic. I did this by tapping it to 3/8" NPT to accept a standard instrument fitting. To avoid stressing the thin remaining wall, I used Devcon as a thread paste and torqued it lightly. After curing I put a wrench on it and was not able to break it free. It has over 50 flight hours on it with no leaks or issues.

Long ago I bought the OMP adapter which I never installed, but am planning to install it now and use an oil reservoir, so the ID of the bushing simply has to be large enough for any possible relief valve flow.

Thanks for the comments.

Todd

C-FSTB

Todd Bartrim

"Whatever you vividly imagine, Ardently desire, Sincerely believe in, Enthusiastically act upon, Must inevitably come to pass"

On Sun, Feb 17, 2013 at 9:27 AM, Kelly Troyer <keltro@gmail.com> wrote:

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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