REFLECTOR:Lycoming IO-540 - very low oil pressure after flight.
Scott Baker
reflector@tvbf.org
Fri, 20 Feb 2004 12:10:34 -0500
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Hello Jim,
The oil pressure values shown in "the pink book" (Lycoming Operators =
Manual) are reflective of the recommended oil pressure sensor pick-up =
location, which is also shown in "the pink book". I talked with John =
Cervini this morning - and he told me that he was operating without this =
important reference manual - he plans to order one today.=20
SB
----- Original Message -----=20
From: Jim Sower=20
To: reflector@tvbf.org=20
Sent: Friday, February 20, 2004 10:12 AM
Subject: Re: REFLECTOR:Lycoming IO-540 - very low oil pressure after =
flight.
That said, I'm of a mind to measure the oil pressure at the worst =
place rather than at the best place. Put my transducer toward the end =
of the oil galley rather than right at the beginning. Actually, I think =
if I had solid state engine monitor instead of steam gauges, I'd measure =
at both places and compare the difference. Quoting oil pressures at the =
top of the system has all the intellectual allure of quoting engine =
weight with no oil in it.=20
Just a theory .... Jim S.=20
=20
Scott Baker wrote:=20
John,=20
What you describe is normal.=20
Warmed oil often drops below the "green" (normal operating) pressure =
range=20
during taxi (low rpm operations). Important note: the "green arc" =
or in=20
your case, the programmed pressure range is pertinent when the =
aircraft is=20
operating at normal power settings (flight) and it is routine for =
oil=20
pressure to drop well below the "green" during taxi (especially when =
the=20
engine oil is hot). Consult the Lycoming "pink" handbook. If the =
oil=20
pressure goes back into the "green" when you run the engine up to =
your=20
normal run-up rpm (1800 to 1900 rpm) - you're fine.=20
Best regards,=20
SB=20
----- Original Message -----=20
From: "John Cervini" <john@johnsonlane.com>=20
To: <reflector@tvbf.org>=20
Sent: Friday, February 20, 2004 12:07 AM=20
Subject: REFLECTOR:Lycoming IO-540 - very low oil pressure after =
flight.=20
> I have a 1000 hr TT IO-540, the top end has been rebuilt to 0 hrs =
by a=20
> reputable company in Florida (my location).=20
> I have about 18 running hrs on it so far.=20
>=20
> It starts fine and really gets my XL-RG off the ground nicely - =
plenty of=20
> power. I registered the aircraft in November and I have had 8 =
flights in=20
> phase 1.=20
> CHT max is around 365 on climb to a few thousand feet. Upon =
startup the=20
oil=20
> pressure is around 95 psi then quicky starts to drop to normal =
range when=20
> the engine gets to operating temp. It's around 50-60 psi by the =
time I am=20
> taxiing. However, when I land, with the throttle at minimum =
position, the=20
> oil pressure drops to a low value, so low that the Micro Vision =
indicator=20
> goes into alarm (below 18-20 psi). By design the oil pressure =
display=20
goes=20
> blank to indicate a low pressure warning - which is not a nice =
thing to=20
see.=20
>=20
> I imagine the engine as being a metal balloon filled with =
pressurized oil=20
> (while running). For the pressure to drop, basically there should =
be a=20
> leak. Since I don't see any oil squirting out of any holes in the =
engine=20
I=20
> don't know what to look at first. (very simple analogy on my =
part)=20
>=20
> Any ideas.=20
>=20
>=20
> john cervini=20
> N444GX=20
>=20
>=20
>=20
>=20
> _______________________________________________=20
> To change your email address, visit=20
http://www.tvbf.org/mailman/listinfo/reflector=20
>=20
> Visit the gallery! www.tvbf.org/gallery=20
> user:pw =3D tvbf:jamaicangoose=20
> Check new archives: www.tvbf.org/pipermail=20
> Check old archives: =
http://www.tvbf.org/archives/velocity/maillist.html=20
>=20
_______________________________________________=20
To change your email address, visit =
http://www.tvbf.org/mailman/listinfo/reflector=20
Visit the gallery! www.tvbf.org/gallery=20
user:pw =3D tvbf:jamaicangoose=20
Check new archives: www.tvbf.org/pipermail=20
Check old archives: =
http://www.tvbf.org/archives/velocity/maillist.html
--=20
Jim Sower ... Destiny's Plaything=20
Crossville, TN; Chapter 5=20
Long-EZ N83RT, Velocity N4095T=20
=20
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<DIV><FONT face=3DArial size=3D2>Hello Jim,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>The oil pressure values shown in "the =
pink book"=20
(Lycoming Operators Manual) are reflective of the recommended oil =
pressure=20
sensor pick-up location, which is also shown in "the pink book". I =
talked=20
with John Cervini this morning - and he told me that he was operating =
without=20
this important reference manual - he plans to order one=20
today. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>SB</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dcanarder@frontiernet.net =
href=3D"mailto:canarder@frontiernet.net">Jim=20
Sower</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Friday, February 20, 2004 =
10:12=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: REFLECTOR:Lycoming =
IO-540 -=20
very low oil pressure after flight.</DIV>
<DIV><BR></DIV>That said, I'm of a mind to measure the oil pressure at =
the=20
<B>worst</B> place rather than at the <B>best</B> place. Put my=20
transducer toward the <B>end</B> of the oil galley rather than right =
at the=20
beginning. Actually, I think if I had solid state engine monitor =
instead=20
of steam gauges, I'd measure at both places and compare the =
difference. =20
Quoting oil pressures at the top of the system has all the =
intellectual allure=20
of quoting engine weight with no oil in it. <BR>Just a theory .... Jim =
S.=20
<BR> =20
<P>Scott Baker wrote:=20
<BLOCKQUOTE TYPE=3D"CITE">John, <BR>What you describe is normal. =
<BR>Warmed=20
oil often drops below the "green" (normal operating) pressure range=20
<BR>during taxi (low rpm operations). Important note: the =
"green arc"=20
or in <BR>your case, the programmed pressure range is pertinent when =
the=20
aircraft is <BR>operating at normal power settings (flight) and it =
is=20
routine for oil <BR>pressure to drop well below the "green" during =
taxi=20
(especially when the <BR>engine oil is hot). Consult the =
Lycoming=20
"pink" handbook. If the oil <BR>pressure goes back into the =
"green"=20
when you run the engine up to your <BR>normal run-up rpm (1800 to =
1900 rpm)=20
- you're fine. <BR>Best regards, <BR>SB=20
<P>----- Original Message ----- <BR>From: "John Cervini"=20
<john@johnsonlane.com> <BR>To: <reflector@tvbf.org> =
<BR>Sent:=20
Friday, February 20, 2004 12:07 AM <BR>Subject: REFLECTOR:Lycoming =
IO-540 -=20
very low oil pressure after flight.=20
<P>> I have a 1000 hr TT IO-540, the top end has been rebuilt to =
0 hrs by=20
a <BR>> reputable company in Florida (my location). <BR>> I =
have about=20
18 running hrs on it so far. <BR>> <BR>> It starts fine and =
really=20
gets my XL-RG off the ground nicely - plenty of <BR>> =
power. I=20
registered the aircraft in November and I have had 8 flights in =
<BR>>=20
phase 1. <BR>> CHT max is around 365 on climb to a few thousand=20
feet. Upon startup the <BR>oil <BR>> pressure is around 95 =
psi then=20
quicky starts to drop to normal range when <BR>> the engine gets =
to=20
operating temp. It's around 50-60 psi by the time I am =
<BR>>=20
taxiing. However, when I land, with the throttle at minimum =
position,=20
the <BR>> oil pressure drops to a low value, so low that the =
Micro Vision=20
indicator <BR>> goes into alarm (below 18-20 psi). By =
design the=20
oil pressure display <BR>goes <BR>> blank to indicate a low =
pressure=20
warning - which is not a nice thing to <BR>see. <BR>> <BR>> I =
imagine=20
the engine as being a metal balloon filled with pressurized oil =
<BR>>=20
(while running). For the pressure to drop, basically there =
should be a=20
<BR>> leak. Since I don't see any oil squirting out of any =
holes in=20
the engine <BR>I <BR>> don't know what to look at first. =
(very=20
simple analogy on my part) <BR>> <BR>> Any ideas. <BR>> =
<BR>>=20
<BR>> john cervini <BR>> N444GX <BR>> <BR>> <BR>> =
<BR>>=20
<BR>> _______________________________________________ <BR>> To =
change=20
your email address, visit <BR><A=20
=
href=3D"http://www.tvbf.org/mailman/listinfo/reflector">http://www.tvbf.o=
rg/mailman/listinfo/reflector</A>=20
<BR>> <BR>> Visit the gallery! www.tvbf.org/gallery =
<BR>>=20
user:pw =3D tvbf:jamaicangoose <BR>> Check new archives:=20
www.tvbf.org/pipermail <BR>> Check old archives: <A=20
=
href=3D"http://www.tvbf.org/archives/velocity/maillist.html">http://www.t=
vbf.org/archives/velocity/maillist.html</A>=20
<BR>>=20
<P>_______________________________________________ <BR>To change =
your email=20
address, visit <A=20
=
href=3D"http://www.tvbf.org/mailman/listinfo/reflector">http://www.tvbf.o=
rg/mailman/listinfo/reflector</A>=20
<P>Visit the gallery! www.tvbf.org/gallery <BR>user:pw =3D=20
tvbf:jamaicangoose <BR>Check new archives: www.tvbf.org/pipermail =
<BR>Check=20
old archives: <A=20
=
href=3D"http://www.tvbf.org/archives/velocity/maillist.html">http://www.t=
vbf.org/archives/velocity/maillist.html</A></P></BLOCKQUOTE>
<P>-- <BR>Jim Sower ... Destiny's Plaything <BR>Crossville, TN; =
Chapter 5=20
<BR>Long-EZ N83RT, Velocity N4095T <BR> =
</P></BLOCKQUOTE></BODY></HTML>
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