X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 25 May 2007 15:37:06 -0400 Message-ID: X-Original-Return-Path: Received: from pan.gwi.net ([207.5.128.165] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTPS id 2067631 for lml@lancaironline.net; Fri, 25 May 2007 15:33:27 -0400 Received-SPF: pass receiver=logan.com; client-ip=207.5.128.165; envelope-from=dhc1@gwi.net Received: from S0032744976 (d-216-195-153-238.gwi.net [216.195.153.238]) by pan.gwi.net (8.13.1/8.13.1) with SMTP id l4PJWjgU082755 for ; Fri, 25 May 2007 15:32:48 -0400 (EDT) (envelope-from dhc1@gwi.net) X-Original-Message-ID: <00ea01c79f03$78f244d0$0500000a@S0032744976> From: "Bill Wade" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] LIVP Oil Pressure Question (TSIO550E)...Fluctuations Noted X-Original-Date: Fri, 25 May 2007 15:32:44 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00E7_01C79EE1.F0D9BC20" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_00E7_01C79EE1.F0D9BC20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable LIVP Oil Pressure Question (TSIO550E)...Fluctuations NotedHello Jeff- A few WAGS: Do the connectors have a wire sleeve and are they crimped with a = ratchet crimper? I had a fluctuating EI fuel pressure gauge and the shop = had used automotive crimpers. I recrimped or replaced the connectors and = the problem went away. Is the engine new as opposed to reman? I bought a new replacement = engine from TCM and discovered the seat for the pressure relief was = rough. It had to be faced with a hand tool supplied by the tech rep. If = it was a reman I think the odds are against that having gone unnoticed = in previous runs. I have an aerobatic Continental IO-360 in my Chipmunk. When I bought = the plane the oil pressure would be stable when cold but fluctuate = erractically when hot. I did a lot of of testing looking for a = correlation to power settings, tried adjusting the pressure relief, even = changed the spring and plunger; no good. En route to OSH the pressure = dipped to 0 briefly then came back up. Quick landing, fiddle with the = relief, ground run was fine. A while later in cruise it happened again. = Landed, replaced the engine with new. On test flight, the SAME = fluctuations! Refacing the seat didn't help (see above). TCM didn't know = what to do. Turns out it was cavitation- the Christen valve and hoses = used for Lycomings (-10) is too small for the Continental. At cruise = settings there just wasn't enough oil getting to the pump. The engine = was originally used for a military trainer down under- the manufacturer = discovered they had to make their own valve body with -16 fittings. That = solved my problem. Do the fluctuations go away at lower RPM settings? If = so there might be a restriction in the pump supply. The TSIO-550 Overhaul Manual shows that the pump body is sealed with = silk thread. I know nothing about it but if there was a pinhole leak in = the right area? I think the mechanical gauge makes sense as a check but it's another = hole to seal for pressurization. -Bill Wade ------=_NextPart_000_00E7_01C79EE1.F0D9BC20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable LIVP Oil Pressure Question (TSIO550E)...Fluctuations = Noted
Hello Jeff-
          &nbs= p;    A=20 few WAGS:
 
  Do the connectors have a wire = sleeve and are=20 they crimped with a ratchet crimper? I had a fluctuating EI fuel = pressure gauge=20 and the shop had used automotive crimpers. I recrimped or replaced the=20 connectors and the problem went away.
 
  Is the engine new as opposed to = reman? I=20 bought a new replacement engine from TCM and discovered the seat for the = pressure relief was rough. It had to be faced with a hand tool supplied = by the=20 tech rep. If it was a reman I think the odds are against that having = gone=20 unnoticed in previous runs.
 
  I have an = aerobatic Continental IO-360=20 in my Chipmunk. When I bought the plane the oil pressure would be stable = when=20 cold but fluctuate erractically when hot. I did a lot of of=20 testing looking for a correlation to power settings, tried = adjusting=20 the pressure relief, even changed the spring and plunger; no good. = En route=20 to OSH the pressure dipped to 0 briefly then came back up. Quick = landing, fiddle=20 with the relief, ground run was fine. A while later in cruise it = happened again.=20 Landed, replaced the engine with new. On test flight, the SAME = fluctuations!=20 Refacing the seat didn't help (see above). TCM didn't know what to do. = Turns out=20 it was cavitation- the Christen valve and hoses used for = Lycomings (-10) is=20 too small for the Continental. At cruise settings there just wasn't = enough=20 oil getting to the pump. The engine was originally used for a = military=20 trainer down under- the manufacturer discovered they had to make = their own=20 valve body with -16 fittings. That solved my problem. Do the=20 fluctuations go away at lower RPM settings? If so there might be=20 a restriction in the pump supply.
 
 The TSIO-550 Overhaul Manual = shows that=20 the pump body is sealed with silk thread. I know nothing=20 about it but if there was a pinhole leak in the right=20 area?
 
  I think the mechanical gauge = makes sense as=20 a check but it's another hole to seal for = pressurization.  -Bill=20 Wade
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