X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1020468 for flyrotary@lancaironline.net; Fri, 24 Jun 2005 13:02:38 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.73; envelope-from=13brv3@bellsouth.net Received: from ibm69aec.bellsouth.net ([65.6.194.9]) by imf25aec.mail.bellsouth.net with ESMTP id <20050624170153.YMLK8692.imf25aec.mail.bellsouth.net@ibm69aec.bellsouth.net> for ; Fri, 24 Jun 2005 13:01:53 -0400 Received: from rd ([65.6.194.9]) by ibm69aec.bellsouth.net with ESMTP id <20050624170153.ORIM13045.ibm69aec.bellsouth.net@rd> for ; Fri, 24 Jun 2005 13:01:53 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Engine Rebuild - Coolant Leak Cause Date: Fri, 24 Jun 2005 12:01:54 -0500 Message-ID: <000001c578de$6c7818d0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C578B4.83A210D0" 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 V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C578B4.83A210D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable At this point, it appears that one of the triangular pieces of the apex = seal (could not find it anywhere) left its proper position (undoubtedly = during my assembly) and got lodged at the end (apex) of one of the rotors. May = have been held their by some combination of the corner and side seal. =20 =20 =20 Hi Ed, =20 Are you saying you think the little triangle piece came out of the slot, = and was wedged flat between the side of the rotor, and the side housing? =20 =20 The rotor running clearance is supposed to be .0047" to .010", so 2mm (.0787") seal ain't gonna fit between the rotor and the housing, if = that's what you were saying. I would bet that you wouldn't be able to turn the engine at all if you bolted it together that way.=20 =20 OR, were you saying you think the triangle piece of seal was still in = the apex seal slot, but being pushed toward the side of the rotor, similar = to having a seal that was too long? =20 =20 In either case, the wear you would see on the opposite side, would be = from the rotor gear, or thrust ring (whichever side that happened to be) of = the rotor, since those are raised above the side of the rotor itself. The = damage to the side housing would be similar to my oil out I would imagine. =20 =20 If the triangle piece of seal was missing, I'd wonder if that wouldn't = let combustion pressure get behind the corner seals (particularly the side = with the missing piece), and push outward creating the extra friction. Of = course I'd wonder why that didn't happen at two places, since that apex seal is = on the leading, and trailing edge of two faces of the rotor. =20 =20 Do you have any pictures of these hot spots? =20 =20 Cheers, Rusty=20 =20 =20 =20 ------=_NextPart_000_0001_01C578B4.83A210D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
At = this point, it=20 appears that one of the triangular pieces of the apex seal (could not = find it=20 anywhere) left its proper position (undoubtedly during my assembly) and = got=20 lodged at the end (apex) of one of the rotors. May have been held their = by some=20 combination of the corner and side seal.  
 
 
Hi=20 Ed,
 
Are you saying you = think the=20 little triangle piece came out of the slot, and was wedged flat between = the side=20 of the rotor, and the side housing? =20
 
The rotor running = clearance is=20 supposed to be .0047" to .010", so  2mm (.0787") seal ain't gonna = fit=20 between the rotor and the housing, if that's what you were saying.  = I would=20 bet that you wouldn't be able to turn the engine at all if you bolted it = together that way. 
 
OR, were you saying you = think the=20 triangle piece of seal was still in the apex seal slot, but being pushed = toward=20 the side of the rotor, similar to having a seal that was too=20 long?  
 
In either case, the = wear you would=20 see on the opposite side, would be from the rotor gear, or thrust=20 ring (whichever side that happened to be) of the rotor, since=20 those are raised above the side of the rotor itself. = The damage=20 to the side housing would be similar to my oil out I would=20 imagine.  
 
If the triangle = piece of seal=20 was missing, I'd wonder if that wouldn't let combustion pressure get = behind the=20 corner seals (particularly the side with the missing piece), and = push=20 outward creating the extra friction.  Of course I'd wonder=20 why that didn't happen at two places, since = that apex seal is on=20 the leading, and trailing edge of two faces of the rotor. =20    
 
Do you have any = pictures of=20 these hot spots?  
 
Cheers,
Rusty=20
 
 
 
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