Return-Path: <13brv3@bellsouth.net> Received: from imf24aec.mail.bellsouth.net ([205.152.59.72] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 573443 for flyrotary@lancaironline.net; Sun, 19 Dec 2004 20:24:13 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.72; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf24aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20041220012342.QDKJ2421.imf24aec.mail.bellsouth.net@rd> for ; Sun, 19 Dec 2004 20:23:42 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Engine Failure modes was Re: [FlyRotary] Engine damage thoughts Date: Sun, 19 Dec 2004 19:24:05 -0600 Message-ID: <000c01c4e632$98b02350$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000D_01C4E600.4E15B350" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_000D_01C4E600.4E15B350 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable My experience has been that there are 2 basic failure modes when oil pressure is lost. =20 Outstanding info Leon, and in your usual full length novel format :-) =20 =20 Spent some time looking at the filter, and found a number of pieces of rubber, which are certainly from installing the hose fittings. Also = found a couple curly bits of aluminum drill shavings from the evap core. Finally, I found what appears to be tiny metallic flakes in the oil = that was sitting in the bottom of the filter housing (Peterson, inline = filter assembly). You can't feel them, and can only see them in a thin layer = of oil with a light shining on it. I believe this could easily be aluminum dust that was trapped in the evap core from when I cut the holes to = install the fittings. I last cleaned the filter housing when I installed the recently failed evap core, so anything that was in that core, would have been trapped by the filter. =20 =20 Next step will be to scrape the bottom of the pan , as suggested, with a wire through the oil drain. I'll also raise the tail and try to drain a = bit more oil from the pan. If there's any sign of metal flakes in the pan, = it's game over, and the engine comes apart. If it's still OK, I'll fire it = up briefly without the oil cooler (since I don't have one), and see if it = blows oil smoke. If that's OK, I'll figure it's go for a new oil cooler, = ground testing, and eventually, flight testing. =20 =20 Cheers, Rusty (jury still out) =20 ------=_NextPart_000_000D_01C4E600.4E15B350 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
My experience has been that there are 2 = basic=20 failure modes when oil pressure is lost.
 
Outstanding=20 info Leon, and in your usual full length novel format=20 :-)   
 

Spent some time looking at the filter, and found a = number of=20 pieces of rubber, which are certainly from  installing the hose = fittings.  Also found a couple  curly bits of aluminum = drill shavings=20 from the evap core.  = Finally,  I found what appears to be tiny = metallic=20 flakes in the oil that was sitting in the bottom of the filter  housing (Peterson, inline filter=20 assembly).  You = can’t feel=20 them, and can only see them in a thin layer of oil with a light shining = on=20 it.  I=20 believe this could easily be aluminum  dust that was trapped in the = evap core=20 from when I cut the holes to install the fittings.  I last cleaned the filter = housing when I=20 installed the recently failed evap core, so anything that was in that = core,=20 would have been trapped by the filter.   

 

Next step will be to scrape the bottom of=20 the pan , as=20 suggested, with a wire through the oil drain.  I’ll also raise the tail = and try to=20 drain a bit more oil from the pan. =20 If there’s any sign of metal flakes in the pan, it’s = game over, and the=20 engine comes apart.  If = it’s still=20 OK, I’ll fire it up briefly without the oil cooler (since I = don’t have one), and=20 see if it blows oil smoke.  If=20 that’s OK, I’ll figure it’s go for a new oil cooler, = ground testing, and=20 eventually, flight testing.     

&nbs= p;

Cheers,

Rusty (jury still = out)    

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