X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 24 Jan 2012 11:06:45 -0500 Message-ID: X-Original-Return-Path: Received: from qmta10.emeryville.ca.mail.comcast.net ([76.96.30.17] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with ESMTP id 5361596 for lml@lancaironline.net; Mon, 23 Jan 2012 16:39:22 -0500 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.17; envelope-from=olsen25@comcast.net Received: from omta03.emeryville.ca.mail.comcast.net ([76.96.30.27]) by qmta10.emeryville.ca.mail.comcast.net with comcast id R9Xi1i0080b6N64AA9en67; Mon, 23 Jan 2012 21:38:47 +0000 Received: from SibranPC ([98.245.158.191]) by omta03.emeryville.ca.mail.comcast.net with comcast id R9em1i00D483eG28P9emmY; Mon, 23 Jan 2012 21:38:46 +0000 From: "Dan & Kari Olsen" X-Original-To: Subject: Lycoming exhaust valve questions X-Original-Date: Mon, 23 Jan 2012 14:38:48 -0700 X-Original-Message-ID: <004201ccda17$647fc5a0$2d7f50e0$@comcast.net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0043_01CCD9DC.B820EDA0" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AczaE/RbS6LUMZcwSq2zmoqBxjYWBg== Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_0043_01CCD9DC.B820EDA0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit LML Gang, 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. 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? . Do the valve lapping procedure per the Lyc service instruction? . Start using TCP and re-check in a few hours? . Go run the engine hard and re-check the compression? . Something else? I really want to nip this in the bud and not end up with a burned exhaust valve, requiring pulling a jug. Appreciate your thoughts and responses. Cheers! Dan Olsen ------=_NextPart_000_0043_01CCD9DC.B820EDA0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

LML = Gang,

 

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.

 

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?

·         = Do the valve lapping procedure per the = Lyc service instruction?

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

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

·         = Something else?

 

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

 

Appreciate = your thoughts and responses.

 

Cheers!

 

Dan = Olsen

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