Return-Path: Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 725300 for flyrotary@lancaironline.net; Fri, 11 Feb 2005 13:28:37 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.68; envelope-from=sqpilot@bellsouth.net Received: from [209.214.45.60] by imf20aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050211182748.SDUV1977.imf20aec.mail.bellsouth.net@[209.214.45.60]>; Fri, 11 Feb 2005 13:27:48 -0500 Received: from 127.0.0.1 (AVG SMTP 7.0.300 [265.8.7]); Fri, 11 Feb 2005 12:27:39 -0600 Message-ID: <00a901c51067$5d30ead0$3c2dd6d1@paul52u7f5qyav> From: "Paul" To: "Rotary motors in aircraft" , References: Subject: Re: [FlyRotary] Re: Oil leak Date: Fri, 11 Feb 2005 12:27:37 -0600 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 Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=======AVGMAIL-420CF91B4CD4=======" --=======AVGMAIL-420CF91B4CD4======= Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A6_01C51035.12751020" ------=_NextPart_000_00A6_01C51035.12751020 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: Steve Brooks=20 To: Rotary motors in aircraft=20 Sent: Wednesday, February 09, 2005 12:48 PM Subject: [FlyRotary] Re: Oil leak John, Don't laugh, but I've heard that you can use flour to help locate the = source of a leak. You put flour on the suspect area, run it a little = bit, and see where the flour has fresh oil on it. I guess that the = theory is that the flour soaks it up, and keeps it from spreading = around. The only down side would be that be fan in the back, blowing the flour = away. Just a thought. Steve Brooks Yes, and if you sift the flower through a screen afterwards and mix it = thoroughly back with the wife's supply, she won't even know you borrowed = it. Paul Conner -----Original Message----- From: Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net]On Behalf Of John Slade Sent: Wednesday, February 09, 2005 1:20 PM To: Rotary motors in aircraft Subject: [FlyRotary] Oil leak Hi Guys, I've been chasing an oil leak for a while now. It only happens when = the engine is running. When I get back from a 20 minute flight the cowl = has oil streaks down the outside, everything under the cowl has an oil = film on it, and the turbo is seriously smokin'. I could probably make a = similar mess by spraying about 1/2 cup of oil at the cowl and engine. Today I took the plane up and down the runway a couple of times and = did a couple of runups with the cowl off. I seem to be a little down on = power - (3950 instead of 4050 on static). When I got back the mount = plate below the turbo had fresh oil on it and I could see air bubbling = through this oil at the joint of the mount plate and the engine, just by = the turbo. See attached picture with arrow. In fact the entire join = between the engine and the plate on the right (turbo) side seems wet = with oil and there's another pool at the front which I don't think = migrated from the back.=20 I get the feeling that this "bubbling" might become a fine jet of = oil which points directly at the turbo when the engine's running, = otherwise I don't see how oil could get up into the turbo housing and = smoke like it does. I'm trying to understand why there might be = pressure here. The breather is definitely not blocked, and in fact, on = this particular run, I'd even left the dipstick out. Could the bubbling = air be a compression leak from the join between the rotor hosing and the = backplate? My oil level is maybe 1/4 - 1/2 inch below the level of the = mount plate and the plane was on a slight grade making the back lower. = The bubbling stopped after a few minutes and did not return when we = turned the prop.=20 I'm resigned to pulling the lower cowl, sump and sump plate and = redoing the RTV join (again), but I'm wondering - should there be = pressure here? Is there some other problem causing this. Am I overfull = with oil? Could the turbo oil return be "landing" on the mount plate, = then running back along the join? I'm planning a compression test next = time I go down to the hangar.=20 Any other thoughts or suggestions? Regards, John (13.9 hrs and holding) -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.6 - Release Date: 2/7/2005 ------=_NextPart_000_00A6_01C51035.12751020 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 Steve=20 Brooks
Sent: Wednesday, February 09, = 2005 12:48=20 PM
Subject: [FlyRotary] Re: Oil = leak

John,
Don't laugh, but I've heard that you can use flour to help = locate the=20 source of a leak.  You put flour on the suspect area, run it a = little=20 bit, and see where the flour has fresh oil on it.  I guess that = the=20 theory is that the flour soaks it up, and keeps it from spreading=20 around.
 
The=20 only down side would be that be fan in the back, blowing the flour=20 away.
 
Just=20 a thought.
 
Steve Brooks
 
 
Yes, = and if you=20 sift the flower through a screen afterwards and mix it thoroughly back = with=20 the wife's supply, she won't even know you borrowed it.  Paul=20 Conner
 
-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of John=20 Slade
Sent: Wednesday, February 09, 2005 1:20 = PM
To:=20 Rotary motors in aircraft
Subject: [FlyRotary] Oil=20 leak

Hi=20 Guys,
I've been chasing an oil leak for a while now. It only = happens when=20 the engine is running. When I get back from a 20 minute flight the = cowl has=20 oil streaks down the outside, everything under the cowl has an = oil film=20 on it, and the turbo is seriously smokin'. I could probably = make a=20 similar mess by spraying about 1/2 cup of oil at the cowl and=20 engine.
 
Today I took the plane up and down the runway a couple of = times and=20 did a couple of runups with the cowl off. I seem to be a little down = on=20 power - (3950 instead of 4050 on static). When I got back the mount = plate=20 below the turbo had fresh oil on it and I could see air bubbling = through=20 this oil at the joint of the mount plate and the engine, just by the = turbo.=20 See attached picture with arrow. In fact the entire join between the = engine=20 and the plate on the right (turbo) side seems wet with oil and = there's=20 another pool at the front which I don't think migrated from the = back.=20
 
I=20 get the feeling that this "bubbling" might become a fine jet of oil = which=20 points directly at the turbo when the engine's running, = otherwise I=20 don't see how oil could get up into the turbo housing and smoke like = it=20 does.  I'm trying to understand why there might be pressure = here. The=20 breather is definitely not blocked, and in fact, on this particular = run, I'd=20 even left the dipstick out. Could the bubbling air be a compression = leak=20 from the join between the rotor hosing and the backplate?  My = oil level=20 is maybe 1/4 - 1/2 inch below the level of the mount plate and the = plane was=20 on a slight grade making the back lower. The bubbling stopped after = a few=20 minutes and did not return when we turned the prop. =
 
I'm resigned to pulling the lower cowl, sump and sump plate = and=20 redoing the RTV join (again), but I'm wondering - should there be = pressure=20 here? Is there some other problem causing this. Am I overfull with=20 oil?  Could the turbo oil return be "landing" on the mount = plate, then=20 running back along the join? I'm planning a compression test next = time I go=20 down to the hangar.
 
Any other thoughts or suggestions?
 
Regards,
John (13.9 hrs and = holding)

No virus found in this incoming message.
Checked by AVG=20 Anti-Virus.
Version: 7.0.300 / Virus Database: 265.8.6 - Release = Date:=20 2/7/2005
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