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To: flyrotary@lancaironline.net
Subject: SWITCHEROO becomes low oil pressure
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Date: Tue, 29 Apr 2014 21:42:09 -0400 (EDT)

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I enjoyed a nice 1.2 hour flight yesterday, but ended with oil or exhaust s=
mell. Never a good thing, conjuring up images of a fuel fire or carbon mono=
xide poisoning.
Today I gave it another routine cowl raising inspection, and noticed the us=
ual oil film. It's everywhere, and comes from no-where. It was cooking off =
from the under slung muffler. I wiped it off, and I think the culprit is th=
e crankcase vent from the oil fill tube. I had to shorten the tube so it wo=
uld fit under the cowl. Now the vent line is pretty low, just over the cent=
er iron into which the oil tube fits. It discharges thru a tube and hose ar=
rangement to the right side of the cowl outlet on the bottom. I think the a=
irflow in this area is turbulent and sometimes back flows into the cowl and=
 spreads all over.
I added another heat shield to keep the radiant glow of the exhaust system =
off of the fuel system.
I also noticed the throttle opened about 40 degrees shy of full open. So I =
adjusted the cable lock nuts to give more; however, the throttle is suffici=
ently oversized that it didn't make an appreciable difference.
After a joyful morning of small improvements and cleaning, I decided to mak=
e an hour flight, have some lunch and do a second hour flight.=20
Well, that was arrogant of me. I made it about 30 minutes and noticed the o=
il pressure had dropped from 62 or better to 38 PSI. Water & oil temps were=
 in the 160F& 170F zone. So I headed for the nearest airport and slowed 'wa=
y down. The oil pressure increased to 39-42, so I eased it on home. Off wit=
h the cowl, oil checks full, everything on the outside of the engine looks =
good. I got a mechanical oil pressure gauge, and yes, 40 PSI at the oil fil=
ter housing, while reading 39 PSI on the Engine Monitor.=20
I'm stripping the 'front' cover off, expecting to find the famous oil O rin=
g blown....Maybe I should have used larger diameter oil discharge hose...
The bolt that takes the 19mm socket on the pulley hub defeated me this even=
ing. I hope it's not a left hand thread...I'll continue tomorrow.

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<font color=3D'black' size=3D'2' face=3D'arial'>
<div><font style=3D"background-color: transparent;">I enjoyed a nice 1.2 ho=
ur flight yesterday, but ended with oil or exhaust smell. Never a good thin=
g, conjuring up images of a fuel fire or carbon monoxide poisoning.</font><=
/div>

<div>Today I gave it another routine cowl raising inspection, and noticed t=
he usual oil film. It's everywhere, and comes from no-where. It was cooking=
 off from the under slung muffler. I wiped it off, and I think the culprit =
is the crankcase vent from the oil fill tube. I had to shorten the tube so =
it would fit under the cowl. Now the vent line is pretty low, just over the=
 center iron into which the oil tube fits. It discharges thru a tube and ho=
se arrangement to the right side of the cowl outlet on the bottom. I think =
the airflow in this area is turbulent and sometimes back flows into the cow=
l and spreads all over.</div>

<div>I&nbsp;added another heat shield&nbsp;to keep the radiant glow of the =
exhaust system off of the fuel system.</div>

<div>I also noticed the throttle opened about 40 degrees shy of full open. =
So I adjusted the cable lock nuts to give more; however, the throttle is su=
fficiently oversized that it didn't make an appreciable difference.</div>

<div>After a joyful morning of small improvements and cleaning, I decided t=
o make an hour flight, have some lunch and do a second hour flight. </div>

<div>Well, that was arrogant of me. I made it about 30 minutes and noticed =
the oil pressure had dropped from 62 or better to 38 PSI. Water &amp; oil t=
emps were in the 160F&amp; 170F&nbsp;zone.&nbsp;So I headed for the nearest=
 airport and slowed 'way down. The oil pressure increased to 39-42, so I ea=
sed it on home. Off with the cowl, oil checks full, everything on the outsi=
de of the engine looks good. I got a mechanical oil pressure gauge, and yes=
, 40 PSI at the oil filter housing, while reading 39 PSI&nbsp;on the Engine=
 Monitor. </div>

<div>I'm stripping the 'front' cover off, expecting to find the famous oil =
O ring blown....Maybe I should have used larger diameter oil discharge hose=
...</div>

<div>The bolt that takes the 19mm socket on the pulley hub defeated me this=
 evening. I hope it's not a left hand thread...I'll continue tomorrow.</div=
>
</font>
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