X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 25 Jan 2012 10:58:00 -0500 Message-ID: X-Original-Return-Path: Received: from qmta08.westchester.pa.mail.comcast.net ([76.96.62.80] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with ESMTP id 5363651 for lml@lancaironline.net; Wed, 25 Jan 2012 05:24:14 -0500 Received-SPF: pass receiver=logan.com; client-ip=76.96.62.80; envelope-from=mjrav@comcast.net Received: from omta05.westchester.pa.mail.comcast.net ([76.96.62.43]) by qmta08.westchester.pa.mail.comcast.net with comcast id RmPH1i0020vyq2s58mPfzi; Wed, 25 Jan 2012 10:23:39 +0000 Received: from mjr ([66.30.31.1]) by omta05.westchester.pa.mail.comcast.net with comcast id RmPe1i00D01T6pe3RmPfmC; Wed, 25 Jan 2012 10:23:39 +0000 X-Original-Message-ID: <002901ccdb4b$ceb6fa30$6701a8c0@mjr> From: "Mark Ravinski" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Lycoming exhaust valve questions X-Original-Date: Wed, 25 Jan 2012 05:26:31 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0026_01CCDB21.E561FE30" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.2001 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.2001 This is a multi-part message in MIME format. ------=_NextPart_000_0026_01CCDB21.E561FE30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dan, In my experience, 75 is nothing to worry about. If you want to worry anyway, there are a couple of things to do. Take the valve cover off and give a sound rap or two on the end of the = valve stem with a soft hammer. This will tend to reseat the valve and = squash any carbon ( dirt ) in the seat. Another thing is to use Marvel Mystery Oil in the oil and fuel according = to the label instructions. It really works just like the claims on the = label. Mark Ravinski 1525 hrs IO360 ----- Original Message -----=20 From: Dan & Kari Olsen=20 To: lml@lancaironline.net=20 Sent: Tuesday, January 24, 2012 11:06 AM Subject: [LML] Lycoming exhaust valve questions LML Gang, =20 Doing the annual on my 320 this week. Compression check shows 77-78 = on cylinders 1, 2, 4. #3 is 75 and I hear pretty good leakage through = the exhaust, indicating a leaking exhaust valve. I've had no indication = of sticking valves or morning sickness. I pulled the rocker cover and = there is no abnormality there. This engine is typically run lean of = peak at power settings of 55-65% power. Oil changes every 25-35hrs. = Engine has 623hrs since new. =20 My question to those of you who are much more experienced with the = Lycoming 4-cylinder engines, is what should be my next course of action? =B7 Do the valve lapping procedure per the Lyc service = instruction? =B7 Start using TCP and re-check in a few hours? =B7 Go run the engine hard and re-check the compression? =B7 Something else? =20 I really want to nip this in the bud and not end up with a burned = exhaust valve, requiring pulling a jug. =20 Appreciate your thoughts and responses. =20 Cheers! =20 Dan Olsen -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG - www.avg.com=20 Version: 9.0.920 / Virus Database: 271.1.1/4163 - Release Date: = 01/24/12 02:34:00 ------=_NextPart_000_0026_01CCDB21.E561FE30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Dan,

In my experience, 75 is nothing to = worry=20 about.

If you want to worry anyway, there are = a couple of=20 things to do.

Take the valve cover off and give a = sound rap or=20 two on the end of the valve stem with a soft hammer. This = will tend=20 to reseat the valve and squash any carbon ( dirt ) in the = seat.

Another thing is to use Marvel Mystery = Oil in the=20 oil and fuel according to the label instructions. It really works = just=20 like the claims on the label.

Mark Ravinski

1525 hrs IO360

----- Original Message -----

From:=20 Dan = & Kari=20 Olsen

To: lml@lancaironline.net

Sent: Tuesday, January 24, 2012 = 11:06=20 AM

Subject: [LML] Lycoming exhaust = valve=20 questions

LML Gang,

Doing the annual on my 320 this week. = Compression=20 check shows 77-78 on cylinders 1, 2, 4. #3 is 75 and I hear = pretty good=20 leakage through the exhaust, indicating a leaking exhaust valve. = I=92ve=20 had no indication of sticking valves or morning sickness. I = pulled the=20 rocker cover and there is no abnormality there. This engine is = typically=20 run lean of peak at power settings of 55-65% power. Oil changes = every=20 25-35hrs. Engine has 623hrs since new.

My question to those of you who are much more = experienced=20 with the Lycoming 4-cylinder engines, is what should be my next course = of=20 action?

=B7 =20 Do the valve lapping procedure per the = Lyc=20 service instruction?

=B7 =20 Start using TCP and re-check in a few=20 hours?

=B7 =20 Go run the engine hard and re-check the = compression?

=B7 =20 Something else?

I really want to nip this in the bud and not end = up with a=20 burned exhaust valve, requiring pulling a jug.

Appreciate your thoughts and = responses.

Cheers!

Dan Olsen

No virus found in this incoming message.
Checked by AVG = -=20 www.avg.com
Version: 9.0.920 / Virus Database: 271.1.1/4163 - = Release=20 Date: 01/24/12 02:34:00
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