X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1020620 for flyrotary@lancaironline.net; Fri, 24 Jun 2005 15:39:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-065-188-083-049.carolina.res.rr.com [65.188.83.49]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j5OJcaY5017829 for ; Fri, 24 Jun 2005 15:38:37 -0400 (EDT) Message-ID: <000701c578f4$519acce0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Engine Rebuild - Coolant Leak Cause Date: Fri, 24 Jun 2005 15:38:38 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01C578D2.CA523E60" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0004_01C578D2.CA523E60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageNow that you mention it, there was a "lightening" hole on that = corner of the rotor -but, then most corners have one or two. I = initially thought perhaps a cocked bearing might have caused it - but, = if that were the case I would expect to see the "hot" spots at opposite = ends of the chambers rather than together. Also, no sign of wear on the = bearings which was surprising - I expected to see scuff marks and such = but none on either the rotor or stationary bearing - so those oil = pressure bearings must take lots of loading. I kept my engine as stock as possible so that if need arise I could = throw in a "junk-yard" engine to get home. The only part I would need = from my engine is the water pump housing which has an AN-16 male fitting = threaded into the inlet. I finally had to buy a 2 1/8" socket (everyone = had plenty of 2 1/4 and 2" sockets to loan- naturally). Not counting = the tools and 1/2 interest with my brother-in-law in an engine lift I = purchased, the total cost in parts was $220. So not too bad - of course = only the soft seals and one apex seal set were required to get it = running again. =20 It fired on the first turn of the prop and I hit 6200 rpm static with = this engine rebuild on a 80F morning - best yet. Ed ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Friday, June 24, 2005 3:25 PM Subject: [FlyRotary] Re: Engine Rebuild - Coolant Leak Cause I am certainly open to other hypothesis that explains the two hot = spots across from one another. I agree it doesn't seem possible, but = it sure looks like something was rubbing and then pushing/cocking the = rotor over at that point. My nephew took some photos when we = disassembled the engine, but I have not yet received them. I'll post = them to the list once I do. It will be interesting to see the pics, not only of the housings, but = also the rotor. If there was that much wear to create a blued spot on = the housing, you would expect there had to be a similar spot on the = rotor, at least on the side without the jammed object. I still don't = see how that could be anywhere but at the thrust surface, or gear of the = rotor though. =20 I did think of a way the corner piece could fit, and that would be if = it happened to land in one of the large, milled balancing holes near the = corner of the rotor. It's still a hard theory to swallow. Certainly = nothing good could come from it though. =20 Rusty (wondering if we should keep a loaner engine in the group) ------=_NextPart_000_0004_01C578D2.CA523E60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Now that you mention it, there was a = "lightening" hole on=20 that corner of the rotor -but, then most corners have one or = two.   I=20 initially thought perhaps a cocked bearing might have caused it - but, = if that=20 were the case I would expect to see the "hot" spots at opposite ends of = the=20 chambers rather than together.  Also, no sign of wear on the = bearings which=20 was surprising - I expected to see scuff marks and such but none on = either the=20 rotor or stationary bearing - so those oil pressure bearings must take = lots of=20 loading.
 
I kept my engine as stock as possible so that if = need=20 arise I could throw in a "junk-yard" engine to get home.  The only = part I=20 would need from my engine is the water pump housing which has an AN-16 = male=20 fitting threaded into the inlet.  I finally had to buy a 2 1/8" = socket=20 (everyone had plenty of 2 1/4 and 2" sockets to = loan- naturally).  Not=20 counting the tools and 1/2 interest with my brother-in-law in an engine = lift I=20 purchased, the total cost in parts was $220.  So not too bad - of = course=20 only the soft seals and one apex seal set were required to get it = running=20 again. 
 
It fired on the first turn of the prop and I hit = 6200 rpm=20 static with this engine rebuild on a 80F morning - best = yet.
 
 
Ed
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Friday, June 24, 2005 = 3:25 PM
Subject: [FlyRotary] Re: Engine = Rebuild -=20 Coolant Leak Cause

I am certainly open to other hypothesis that = explains=20 the two hot spots across from one another.   I agree it = doesn't seem=20 possible, but it sure looks like something was rubbing and then=20 pushing/cocking the rotor over at that point.    My = nephew took=20 some photos when we disassembled the engine, but I have not yet = received=20 them.  I'll post them to the list once I do.
 
 
It will be=20 interesting to see the pics, not only of the housings, but also = the=20 rotor.  If there was that much wear to create a blued = spot on=20 the housing, you would expect there had to be a similar spot on the = rotor, at=20 least on the side without the jammed object.  I still don't = see how=20 that could be anywhere but at the thrust surface, or gear of the rotor = though. 
 
I did=20 think of a way the corner piece could fit, and that would be if = it=20 happened to land in one of the large, milled balancing holes = near=20 the corner of the rotor.  It's still a hard theory to = swallow. =20 Certainly nothing good could come from it though.  =
 
Rusty=20 (wondering if we should keep a loaner engine in the=20 group)
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