X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 02 Jun 2011 08:28:33 -0400 Message-ID: X-Original-Return-Path: Received: from nschwmtas04p.mx.bigpond.com ([61.9.189.146] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 5001223 for lml@lancaironline.net; Thu, 02 Jun 2011 06:28:02 -0400 Received-SPF: pass receiver=logan.com; client-ip=61.9.189.146; envelope-from=frederickmoreno@bigpond.com Received: from nschwotgx04p.mx.bigpond.com ([124.182.89.114]) by nschwmtas04p.mx.bigpond.com with ESMTP id <20110602102723.TQLI14357.nschwmtas04p.mx.bigpond.com@nschwotgx04p.mx.bigpond.com> for ; Thu, 2 Jun 2011 10:27:23 +0000 Received: from Razzle ([124.182.89.114]) by nschwotgx04p.mx.bigpond.com with ESMTP id <20110602102722.PUTQ10390.nschwotgx04p.mx.bigpond.com@Razzle> for ; Thu, 2 Jun 2011 10:27:22 +0000 MIME-Version: 1.0 X-Original-Message-Id: <4DE7657C.000083.03116@RAZZLE> X-Original-Date: Thu, 2 Jun 2011 18:27:08 +0800 Content-Type: Multipart/Alternative; charset="US-ASCII"; boundary="------------Boundary-00=_8PR5OW18WCW000000000" X-Mailer: IncrediMail (6244788) From: "Frederick Moreno" X-FID: FLAVOR00-NONE-0000-0000-000000000000 X-Priority: 3 X-Original-To: "Lancair Mail (lml@lancaironline.net)" Subject: Fw: Re: [LML] Optimum IO-550 oil level - zero oil pressure event X-Authentication-Info: Submitted using SMTP AUTH LOGIN at nschwotgx04p.mx.bigpond.com from [124.182.89.114] using ID frederickmoreno@bigpond.com at Thu, 2 Jun 2011 10:27:22 +0000 X-SIH-MSG-ID: qBgxFtP8TFa2kTAvmTy2alorgFm6/gF5uMhSBI0wt0lHEVbCu8XAQsKhbatI34/n0C4obl+VRCR+c7zmTY7RuNu3K75SSrLZ5vk2 --------------Boundary-00=_8PR5OW18WCW000000000 Content-Type: Text/Plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable =0D Your situation could also be related to the grounding of the sensor. An intermittent ground could possibly cause zero readings.=0D =0D Mike Easley=0D =0D I am always suspicious of sensors, wiring and connectors. After writing,= we returned to the hangar after pulling the engine, connected a compressed a= ir hose to the EI oil pressure sensor on the firewall, and fussed. No probl= ems indicated pressure tracked the air pressure regulator. Then we had some aggressive wiggling of sensor, wiring, connectors, and wire bundles. Roc= k solid, no evidence of intermittent connection. =0D =0D This coupled with the fact that hitting the brakes during taxi causing oi= l pressure dips suggests it is not instrumentation, but a real oil pressure problem. Pan comes off for a look tomorrow, at the engine shop. =0D =0D Fred --------------Boundary-00=_8PR5OW18WCW000000000 Content-Type: Text/HTML; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

= ;

Your situation could also be related to the grounding of the sensor.= An intermittent ground could possibly cause zero readings.

Mike Easley

I am always suspicious of sensors, wiring and connectors. Afte= r writing, we returned to the hangar after pulling the engine, connected = a compressed air hose to the EI oil pressure sensor on the firewall, and = fussed. No problems, indicated pressure tracked the air pressure re= gulator. Then we had some aggressive wiggling of sensor, wiring, co= nnectors, and wire bundles. Rock solid, no evidence of intermittent= connection.

This coupled with the fact that hitting the brakes during taxi causi= ng oil pressure dips suggests it is not instrumentation, but a real oil p= ressure problem. Pan comes off for a look tomorrow, at the engine s= hop.

Fred

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