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Subject: Re: [LML] Crankcase "venting" after flight
From: "William A. Hogarty" <billhogarty@gmail.com>
X-Original-To: Lancair Mailing List <lml@lancaironline.net>
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No Big Deal.

If the oil cap is is left cracked to vent the moisture still in the
crankcase after flying, it means that the oil door   has to be also open
Pretty hard to miss on the preflight.  Pretty hard to miss when starting
the engine.

Cant see much of a problem here

Bill Hogarty

On Wed, Mar 21, 2012 at 7:47 AM, Gary Casey <casey.gary@yahoo.com> wrote:

>  The other day, I watched someone taxi up and the first thing he did was
> open the oil door and take off the cap.  I (politely, of course :-) asked
> him why he did that, to which he replied, "look at all those fumes - I'm
> letting them out."  And I then read in the last Lancair post, ".... and
> crankcase always vented after flying."  Is this a normal thing to do?  In
> 40 years of flying I've only seen it done once and never heard of the
> practice before or since.  I can't imagine that opening the cap does much
> to change the atmosphere in the crankcase.  Is there any test data or
> theory to support the practice?  I'll admit that I'm a bit paranoid - If I
> check the oil and find I need some, I'll carefully replace the cap
> (assuming the dipstick is part of the cap), go get the oil and then take
> the cap back off to pour it in.
>
> I try to never walk away, leaving anything in an unairworthy condition
> assuming I'll come back and fix it later.  Maybe it goes way back to when
> someone took off from the local airport, noticed oil coming from the
> cowling (of a twin), realized that he had left off an oil cap, shut the
> engine down, overflew several good airports to come back, came in high,
> made a go-round, botched it, and you know the rest.  One of the well-known
> test pilots did my first flight.  He was casually (correction - I don't
> think anything he does is "casual") watching me replace the plugs.  I
> hand-tightened the wires and walked away to get a wrench.  He about had a
> heart attack and chastised me for walking away with parts of the plane
> looking like they were attached, but weren't.  He said "get the wrench
> first, then put the wires on."
>
> Gary Casey
>

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<div>No Big Deal.=A0 </div>
<div>=A0</div>
<div>If the oil cap is is left cracked to vent the moisture still in the cr=
ankcase after flying, it means that the oil door=A0 =A0has to be also open=
=A0 Pretty hard to miss on the preflight.=A0 Pretty hard to miss when start=
ing the engine.</div>

<div>=A0</div>
<div>Cant see much of a problem here</div>
<div>=A0</div>
<div>Bill Hogarty<br><br></div>
<div class=3D"gmail_quote">On Wed, Mar 21, 2012 at 7:47 AM, Gary Casey <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:casey.gary@yahoo.com">casey.gary@yahoo.=
com</a>&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PA=
DDING-LEFT:1ex" class=3D"gmail_quote">
<div>
<div style=3D"BACKGROUND-COLOR:#fff;FONT-FAMILY:bookman old style,new york,=
times,serif;COLOR:#000;FONT-SIZE:12pt">
<div style=3D"FONT-FAMILY:&#39;bookman old style&#39;,&#39;new york&#39;,ti=
mes,serif;FONT-SIZE:12pt">The other day, I watched someone taxi up and the =
first thing he did was open the oil door and take off the cap. =A0I (polite=
ly, of course :-) asked him why he did that, to which he replied, &quot;loo=
k at all those fumes - I&#39;m letting them out.&quot; =A0And I then read i=
n the last Lancair post, &quot;....<span style=3D"FONT-FAMILY:arial,helveti=
ca,sans-serif;COLOR:rgb(69,69,69);FONT-SIZE:13px">=A0and crankcase always v=
ented after flying.&quot; =A0</span>Is this a normal thing to do? =A0In 40 =
years of flying I&#39;ve only seen it done once and never heard of the prac=
tice before or since. =A0I can&#39;t imagine that opening the cap does much=
 to change the atmosphere in the crankcase. =A0Is there any test data or th=
eory to support the practice? =A0I&#39;ll admit that I&#39;m a bit paranoid=
 - If I check the oil and find I need some, I&#39;ll carefully replace the =
cap (assuming the dipstick is part of the cap), go get the oil and then tak=
e the cap back off to pour it in.</div>

<div style=3D"FONT-FAMILY:&#39;bookman old style&#39;,&#39;new york&#39;,ti=
mes,serif;FONT-SIZE:12pt"><br></div>
<div style=3D"FONT-FAMILY:&#39;bookman old style&#39;,&#39;new york&#39;,ti=
mes,serif;FONT-SIZE:12pt">I try to never walk away, leaving anything in an =
unairworthy condition assuming I&#39;ll come back and fix it later. =A0Mayb=
e it goes way back to when someone took off from the local airport, noticed=
 oil coming from the cowling (of a twin), realized that he had left off an =
oil cap, shut the engine down, overflew several good airports to come back,=
 came in high, made a go-round, botched it, and you know the rest. =A0One o=
f the well-known test pilots did my first flight. =A0He was casually (corre=
ction - I don&#39;t think anything he does is &quot;casual&quot;) watching =
me replace the plugs. =A0I hand-tightened the wires and walked away to get =
a wrench. =A0He about had a heart attack and chastised me for walking away =
with parts of the plane looking like they were attached, but weren&#39;t. =
=A0He said &quot;get the wrench first, then put the wires on.&quot;</div>

<div style=3D"FONT-FAMILY:&#39;bookman old style&#39;,&#39;new york&#39;,ti=
mes,serif;FONT-SIZE:12pt"><br></div><font color=3D"#888888">
<div style=3D"FONT-FAMILY:&#39;bookman old style&#39;,&#39;new york&#39;,ti=
mes,serif;FONT-SIZE:12pt">Gary Casey</div></font></div></div></blockquote><=
/div><br>

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