Peter,

 

I was also running the Andair air/oil separator with the drain to a 3 oz reservoir.  I took it out to see if it had anything to do with the Crankcase Pressure=OIL ON BELLY problem, it didn’t.  I want to use a reservoir to monitor how much oil and moisture is blowing by between oil changes.  Our airport is closed for the next 4 or 5 days for maintenance so further testing is delayed.

 

Steve

 

 

From: PJHWFD
To: lml@lancaironline.net
Sent: 5/28/2008 6:41:08 A.M. Eastern Daylight Time
Subj: Re: [LML] Re: Oil leak

 

Steve
I to had oil blowby problems and ended up installing an Andair oil separator. I installed a backet on the left accessory case and drained back intoa hex bolt below the separator. This did not work and I had results similar to you. My feeling is that I was getting back flow off high pressure oil from the drain. Lancair recomended this Location. I switched the drain to the valve cover which is where Beechcraft and Cirrus loccation theirs. End off problem for me.  Now using less than qt/5hrs and a clean belly.  What is your separator setup?
Peter Hebert

-----Original Message-----
From: Steve Colwell <mcmess1919@yahoo.com>
To: lml@lancaironline.net
Sent: Tue, 27 May 2008 6:54 pm
Subject: [LML] Re: Oil leak

Michael,

Tests for cowl air pressure penetrating the case have been inconclusive so

far. The latest attempt to find a crankcase air leak was a very sensitive

test instrument pulling vacuum on the crankcase while I hosed down every

penetration point on the engine top and bottom with a high volume air

compressor.

The balloon and soap suds test found a very small leak where the steel tube

for the rubber vent line enters the dip stick housing.  JB Weld fixed that.

When aluminum tape was applied to the Dipstick to Dipstick Housing, tie

wraps were also used for double security during the flight test. 

Steve Colwell  Legacy  916 505-6099

You Said:

During runup and takeoff roll the manometer (tapped into the crankcase vent

about the mid-point of its length) will read zero until plane has about 120

knots indicated airspeed.  At 120 to 200 knots the manometer reads 4" to 5"

with a MOMENTARY spike up to 14" to 20" when power is reduced in the

pattern.

This symptom suggests that airspeed is pressurizing the case and pushing oil

out. Check the Oil filler cap for a proper gasket and for proper sealing of

the gasket.