Return-Path: Received: from fed1rmmtao07.cox.net ([68.230.241.32] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 573630 for flyrotary@lancaironline.net; Mon, 20 Dec 2004 00:06:30 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.32; envelope-from=daveleonard@cox.net Received: from davidandanne ([68.111.224.107]) by fed1rmmtao07.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with SMTP id <20041220050554.VWWQ21886.fed1rmmtao07.cox.net@davidandanne> for ; Mon, 20 Dec 2004 00:05:54 -0500 From: "DaveLeonard" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Engine Failure modes was Re: [FlyRotary] Engine damage thoughts Date: Sun, 19 Dec 2004 21:06:07 -0800 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0033_01C4E60E.8EF359A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0033_01C4E60E.8EF359A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit MessageRusty, try taking a magnet to some of that stuff. Its great for sorting out alum/rubber from steel/iron. Dave Leonard My experience has been that there are 2 basic failure modes when oil pressure is lost. Outstanding info Leon, and in your usual full length novel format :-) 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. 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. Cheers, Rusty (jury still out) ------=_NextPart_000_0033_01C4E60E.8EF359A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Rusty, try taking a magnet to some of that stuff.  = Its great=20 for sorting out alum/rubber from steel/iron. 
 
Dave=20 Leonard

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=20 shavings from the evap core. =20 Finally,  I found = what=20 appears to be tiny metallic flakes in the oil that was sitting in the = bottom=20 of the filter  housing = (Peterson, inline=20 filter assembly).  = You=20 can’t feel them, and can only see them in a thin layer of oil = with a light=20 shining on 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=20 I 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=20 scrape the bottom of the pan , as suggested, with a wire = through the=20 oil drain.  I’ll = also raise the=20 tail and try to drain a bit more oil from the pan.  If there’s any sign of = metal flakes in=20 the pan, it’s game over, and the engine comes apart.  If it’s still OK, = I’ll fire it up=20 briefly without the oil cooler (since I don’t have one), and see = if it blows=20 oil smoke.  If = that’s OK, I’ll=20 figure it’s go for a new oil cooler, ground testing, and = eventually, flight=20 testing.     

&nbs= p;

Cheers,

Rusty = (jury still=20 out)    

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