X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 26 May 2008 00:32:22 -0400 Message-ID: X-Original-Return-Path: Received: from smtp119.sbc.mail.sp1.yahoo.com ([69.147.64.92] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with SMTP id 2937914 for lml@lancaironline.net; Sun, 25 May 2008 10:41:26 -0400 Received: (qmail 28806 invoked from network); 25 May 2008 14:41:25 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=sbcglobal.net; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:Thread-Index:In-Reply-To:X-MimeOLE; b=0CVTKvT6S5Q189EgAvtGdIHAlwxWz0bp2LvqO+/y1EDxN0ueOau+TKoJJX/J+rKEkQrOVLr5CKsiUaBJbec0ZLtEl4jrgcxAgtthsim+97+m1H+jNv52N1cFdNQ4kNeK8F91YJUcn/GGGF6dXnJYPXxzfx8na58Luouu6JoNDKg= ; Received: from unknown (HELO BUCKYSDELL) (buckyw@sbcglobal.net@71.128.110.148 with login) by smtp119.sbc.mail.sp1.yahoo.com with SMTP; 25 May 2008 14:41:24 -0000 X-YMail-OSG: tsh6WgEVM1k3LokGKsdEMIsa5CvGjdalc97iJCstFCOs0IcV7dvrOWpBaYuSMSwQbOmCTcd3lPYVY397zpBETu6rZ_ZRJTliAbysv.lHdj5ucx9kJFoFVS.IBzaKuUj3mUA- X-Yahoo-Newman-Property: ymail-3 From: "Bucky Whittier" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Crankcase pressure=OIL ON BELLY X-Original-Date: Sun, 25 May 2008 07:41:09 -0700 X-Original-Message-ID: <000901c8be75$5f7ba950$4601a8c0@BUCKYSDELL> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000A_01C8BE3A.B31CD150" X-Mailer: Microsoft Office Outlook 11 Thread-Index: Aci+YjcRU1Y7fKS8TWCXlmDcsyldHQAEgDAg In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_000A_01C8BE3A.B31CD150 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Steve, I had the same problem with my 360. I installed the M-20 air oil = separator and only fill to 7 qts. No more oil on belly. My two cents! Good luck and keep that beauty clean. Bucky =20 =20 _____ =20 From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Steve Colwell Sent: Sunday, May 25, 2008 5:24 AM To: lml@lancaironline.net Subject: [LML] Crankcase pressure=3DOIL ON BELLY =20 My Cont. IO-550 (normally aspirated, stock comp ratio) is blowing = enough oil from the crankcase breather to put a thick coat on =BD of the = belly, halfway to the tail in 10 min. of flying. Originally I thought I had overfilled the 8 qt. crankcase so I drained the oil, changed the filter = and refilled with 6.5 qts. During runup and takeoff roll the manometer = (tapped into the crankcase vent about the mid-point of its length) will read = zero until plane has about 120 knots indicated airspeed. At 120 to 200 knots = the manometer reads 4=94 to 5=94 with a short spike up to 14=94 to 20=94 = when power is reduced in the pattern. The following tests have been run: =20 Compression test: high 60=92s to low 70=92s which I am told is normal = for Continentals, oil is normal color (not black, which would indicate = blow-by) =20 Washed engine with mineral spirits to see if any fresh oil was = appearing. =20 =20 Upper plugs are normal color, maybe a dark tan insulator, no fouling problems =20 Low pressure on crankcase with 12=94 balloon on crankcase vent: takes = about 3 min to deflate, tried soap suds around all accessible seals, dipstick = cap, mags, pushrod tubes, etc.. =20 Relocated crankcase vent to right side cowl outlet =20 Cut a anti-siphon hole 6=94 above the end of the vent tube on normal = left side exit. =20 Taped the dipstick cap with aluminum tape. =20 Put 20 psi air pressure on crankcase, soap suds again, air going past = piston rings, tried turning prop with no noticeable difference from cyl to cyl. =20 Replaced crankshaft seal. =20 Anything that required a flight test would deposit the same thick coat = of oil on the belly in a single trip around the pattern. I have just = about run out of ideas, the engine builder has never heard of anything like = this and the cylinder supplier could only suggest it could be the crankshaft seal. It could be a leaking seal in the alternators or mags or ???? = I need help. =20 Steve Colwell Legacy 916 505-6099 =20 =20 =20 =20 ------=_NextPart_000_000A_01C8BE3A.B31CD150 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Steve,

I had the same problem with my 360. = I installed the M-20 air oil separator and only fill to 7 qts. No more oil = on belly.

My two cents! Good luck and keep = that beauty clean.

Bucky

=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0

 

From: = Lancair Mailing List = [mailto:lml@lancaironline.net] On Behalf Of Steve Colwell
Sent: Sunday, May 25, = 2008 5:24 AM
To: = lml@lancaironline.net
Subject: [LML] Crankcase pressure=3DOIL ON BELLY

 

My Cont. IO-550 (normally aspirated, stock comp ratio)  is blowing = enough oil from the crankcase breather to put a thick coat on  =BD of the = belly, halfway to the tail in 10 min. of flying.  Originally I thought I = had overfilled the 8 qt. crankcase so I drained the oil, changed the filter = and refilled with 6.5 qts.  During runup and takeoff roll the manometer (tapped into the crankcase vent about the mid-point of its length) will = read zero until plane has about 120 knots indicated airspeed.  At 120 to = 200 knots the manometer reads 4” to 5” with a short spike up to 14” to 20” when power is reduced in the pattern.  The following tests have been run:

 

Compression test:  high 60’s to low 70’s which I am told is normal = for Continentals, oil is normal color (not black, which would indicate = blow-by)

 

Washed engine with mineral spirits to see if any fresh oil was appearing.  =

 

Upper plugs are normal color, maybe a dark tan insulator, no fouling = problems

 

Low pressure on crankcase with 12” balloon on crankcase vent:  = takes about 3 min to deflate, tried soap suds around all accessible seals, = dipstick cap, mags, pushrod tubes, etc..

 

Relocated crankcase vent to right side cowl outlet

 

Cut a anti-siphon hole 6” above the end of the vent tube on normal = left side exit.

 

Taped the dipstick cap with aluminum tape.

 

Put 20 psi air pressure on crankcase, soap suds again, air going past piston = rings, tried turning prop with no noticeable difference from cyl to = cyl.

 

Replaced crankshaft seal.

 

Anything that required a flight test would deposit the same thick coat of oil on = the belly in a single trip around the pattern.   I have just about = run out of ideas, the engine builder has never heard of anything like this = and the cylinder supplier could only suggest it could be the crankshaft seal.   = It could be a leaking seal in the alternators or mags or = ????    I need help.

 

Steve Colwell  Legacy   916 = 505-6099

 

 

 

 

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