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Oil in sump

 
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Speedy11(at)aol.com
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PostPosted: Mon Apr 19, 2010 1:12 pm    Post subject: Oil in sump Reply with quote

Engine Experts,
I have a Barrett IO-390.
When I removed one of the intake pipes from the sump to the cylinder the other day, the sump had oil in it.
Should the sump where the intake pipes insert have oil in it??
If so, how much is permissible?
Stan Sutterfield

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MONTY(at)bpaengines.com
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PostPosted: Tue Apr 20, 2010 7:50 am    Post subject: Oil in sump Reply with quote

It is common for some oil to be in the plenum. The sump itself is full of oil so I suspect you are referring to the plenum, which is part of the induction system and is below the sump.

The reason that there is some oil in there is because when the engine is operated at slow speed, such as taxi speed, the rocker boxes get overfilled with oil, more so on a fresh engine where the ball sockets of the pushrods have not bedded themselves to each corresponding rocker. Then when the engine shuts down the oil in the rocker box will run thru the intake guide, down the inlet pipe to the plenum, assisted by some fuel which, when shutdown, will " dribble " out of the fuel nozzle, diluting the oil and lowering is viscosity. Then the fuel evaporates leaving the oil residue.

There are 1/8 NPTF holes in the lower edge of the plenum in which a " sniffle valve " should be installed. Put a sniffle valve in the lower port when the aircraft is sitting on the ground. This valve is used to drain off residual fuel and oil. It's primary purpose is to minimize an induction fire during a balked start. Use the one made by Airflow Performance which has 1/8 NPTM thread on one end and -4 flare on the other. Run a line overboard from underneath the cowling.

Monty Barrett
Barrett Precision Engines, Inc.
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