Thanks guys,

We've borescoped looking for scoring, but I hear you probably need the
cylinder(s) off to find it.  The outlet of the breather is currently
forward of the aft end of the cowl flap, so we're currently extending it.
If it dumps oil again, we'll separately plumb the turbo-related oil vents
that dump into the breather to make sure it's not going through there and
I may buy/borrow a wireless manometer (to avoid the wires/tubes into the
pressurized cabin issue) to monitor breather pressure in flight.

> I know of no other way than to put a line from up the breather tube into
> the region below the oil cap to measure pressure, and run it back to
> either a manometer or airspeed indicator...

> ------Original Message------
> From: Craig Jimenez
> To: Fred Moreno
> To: mcmess1919@yahoo.com
> To: Clark Baker
> Subject: [LML] Oil going overboard - TSIO-520WB
> Sent: Jul 5, 2013 19:50
>
> Clark, Steve, and Fred,
>
> What do you recommend for monitoring crankcase pressure in various phases
> of flight?  I'd assume it's something that temporarily replaces the oil
> dip-stick cap?  Running wires into the pressurized cabin would be a pain
> for a temporary test, but could be managed.
>
> The TSIO-520WB on the left side of my P-Baron infrequently dumps about a
> quart a minute out the breather (clean oil on the flaps). Twice happened
> on initial climb, last time on low-power descent like you describe.
> Basic
> compression test good, did find that the breather outlet is in front of
> the cowl flap exit, whereas on others it is a couple inches aft.