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                           Lom-List Digest Archive
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                     Total Messages Posted Mon 08/18/03: 1
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Today's Message Index:
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     1. 06:38 PM - Oil in exhaust pipe  (Jeayers1@aol.com)
 
 
 
________________________________  Message 1  _____________________________________


Time: 06:38:03 PM PST US
From: Jeayers1@aol.com
Subject: Lom-List: Oil in exhaust pipe

--> Lom-List message posted by: Jeayers1@aol.com

Hi All,

I visited a high wing homebuilt with a LOM M332C installed on my way back 
from Oshkosh.
He had oil seeping out of the slip joints in the exhaust pipes.

In comparing his LOM installation with my RV-3 LOM installation and comparing 
various symptoms, he removed the cam case oil drain plug from his cold 
engine.  The cam case was filled with FUEL and oil.  The fuel pump oil cavity also

had fuel in it.
If he had checked these areas after running the engine to warm the oil, he 
wouldn't have seen the fuel in these two areas.

The check valve in his fuel return line apparently wasn't working properly, 
because there was fuel pressure from the fuel tank to the fuel pump on the 
return line side only.  However, leaving the fuel valve ON would also cause the

fuel tank head pressure to continuously be at the fuel pump.

He knew of one other high wing homebuilt with the same oil leakage at the 
exhaust slip joints.  In talking to other high wing homebuilt owners with the LOM

installation, I found another one.

My RV-3 has four individual exhaust pipes.  It is a low wing homebuilt, so it 
won't have the head pressure in the supply or return fuel lines.  It has the 
oil valve installed in the engine.  I do not have any oil leakage from the 
exhaust pipes.

It does seem to me that diluting the oil with fuel is a very bad thing to 
happen.

Jim Ayers