Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Tue, 18 May 2004 11:59:14 -0400 Message-ID: X-Original-Return-Path: Received: from out008.verizon.net ([206.46.170.108] verified) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 3239047 for lml@lancaironline.net; Tue, 18 May 2004 11:46:07 -0400 Received: from ieee.org ([4.15.153.156]) by out008.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20040518154606.SRWE27801.out008.verizon.net@ieee.org> for ; Tue, 18 May 2004 10:46:06 -0500 X-Original-Message-ID: <40AA2FAC.9090702@ieee.org> X-Original-Date: Tue, 18 May 2004 08:45:48 -0700 From: "Charles R. Patton" Reply-To: charles.r.patton@ieee.org User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5) Gecko/20031007 X-Accept-Language: en-us, en MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: LN2 Oildyne -- burrs in pump note References: In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Authentication-Info: Submitted using SMTP AUTH at out008.verizon.net from [4.15.153.156] at Tue, 18 May 2004 10:46:06 -0500 I am just completing the annual on our 360 and would like to share a point. At 155 hrs. the gear up had started to act strange. It would start and stop over a period of about 2 minutes eventually raising the gear. It had worked fine in the past and it had passed Mike’s “95% up and then quick down” test. On jacks it was observed that the hi-pressure was getting to about 500-600 and so was the lo-pressure side, almost like a total leak in a cylinder. Having read the thread about the spool valve, I decided to check it out. I pulled the check valves and spool and found the following. 1) The spool was installed with the O-ring to the low pressure side. Called Oildyne to verify. Confirmed that need to install with O-ring to toward the hi-pressure side. But now the IMPORTANT observation. 2) When the spool was machined, burrs were left on the square projections on each end. These burrs were digging metal out of the check valve faces. This means that metal debris was being introduced into the system – a very bad thing. I de-burred and polished the projections and refaced the check valves, reinstalled and now the gear goes up without a burp. At this point, I would recommend you check the spool valve if you’ve never taken the pump apart, even if the system is working properly. I was able to do this in the plane, without removing the pump. Maybe an hour, not counting the time at home checking the rings and polish job with a microscope. Charles Patton N360JM