X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 17 Mar 2006 12:05:21 -0500 Message-ID: X-Original-Return-Path: Received: from colossus.formysite.com ([64.58.34.10] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTPS id 1037251 for lml@lancaironline.net; Fri, 17 Mar 2006 10:19:52 -0500 Received-SPF: none receiver=logan.com; client-ip=64.58.34.10; envelope-from=genemartin@enid.com Received: from yolanda ([66.138.13.85]) by colossus.formysite.com (8.12.8/8.12.8) with SMTP id k2HFIv15023892 for ; Fri, 17 Mar 2006 09:19:00 -0600 X-Original-Message-ID: <003001c649d6$2531fda0$6501a8c0@yolanda> From: "Gene Martin" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Fuel Drains X-Original-Date: Fri, 17 Mar 2006 09:19:06 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002D_01C649A3.D6F0F3D0" 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 This is a multi-part message in MIME format. ------=_NextPart_000_002D_01C649A3.D6F0F3D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Charlie.......O SO RITE. there are 2 TCM SB's out on seal leaks. = SB00-10 about coated seals pushing out and oversize housings. CSB01-1 = about leak tests for installed pumps. One more thing to remember is that = on the altitude compensating (auto leaning) IO-550 pumps the OLD drain = is the sensing port for the compensating section of the pump. Happy Trails Gene Martin ----- Original Message -----=20 From: Charlie Kohler=20 To: Lancair Mailing List=20 Sent: Wednesday, March 15, 2006 11:45 PM Subject: [LML] Fuel Drains Twice in a the last few weeks , I have found engine driven fuel pump = drains with shipping caps installed. It appears that mechanics/builders are not aware of the importance of = installing a drain in the dry bay between the engine driven fuel pump = and the accessory section of the engine.=20 Here is what is involved. If the seal were to fail in the engine = driven fuel pump--raw fuel would go into the dry bay, and if the drain = is capped, fuel will blow out the engine seal and go into the crank = case. Imagine with me. There you are at 24,000 feet, you may notice a slight = drop in fuel flow, not much. Engine driven fuel pump pressure will be = directed toward the engine seal / blow it out and go directly into the = engine crank case. And oil will be diluted as it is contaminated with = fuel.=20 After two or 3 gallons get into the crank case, how much lubrication = do you think that will be?=20 What if,-- it just happened to ignite as the crank case overflows out = into the turbos? Scary huh? Here's a test. On your next preflight take two pieces of masking tape, = and write "manifold drain" on one and "engine driven fuel pump" on the = other. Get underneath your cowling and put the tape against the drain = line that you believe to match the name on the tape. Take the cowling off. Make sure that these two critical lines are = properly identified--and installed--and DRY.=20 ANY fuel and out of either of these lines and you should not fly under = any circumstances. If fuel leaks through the manifold valve diaphragm, the engine may = continue, repeat MAY, continue to run for several minutes with electric = fuel pump on high. But if the diaphragm is split--eventually even high = boost will not hold the valve open in the engine will stop. We are so used to seeing fuel drain from the bottom of the cowling = from the sniffle valve--that we ignore these other two drains which are = critical.=20 Charlie K. ------=_NextPart_000_002D_01C649A3.D6F0F3D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Charlie.......O SO RITE.  there = are 2 TCM SB's=20 out on seal leaks. SB00-10 about coated seals pushing out and oversize = housings.=20 CSB01-1 about leak tests for installed pumps. One more thing to remember = is that=20 on the altitude compensating (auto leaning) IO-550 pumps the OLD drain = is the=20 sensing port for the compensating section of the pump.
Happy Trails
Gene Martin
----- Original Message -----
From:=20 Charlie=20 Kohler
Sent: Wednesday, March 15, 2006 = 11:45=20 PM
Subject: [LML] Fuel = Drains

Twice in a the last few weeks , I have found engine = driven=20 fuel pump drains with shipping caps installed.

 

It appears that mechanics/builders are not aware of = the=20 importance of installing a drain in the dry bay between the engine = driven fuel=20 pump and the accessory section of the engine.

 

Here is what is involved. If the seal were to fail = in the=20 engine driven fuel pump--raw fuel would go into the dry bay, and if = the drain=20 is capped, fuel will blow out the engine seal and go into the crank=20 case.

 

Imagine with me. There you are at 24,000 feet, you = may notice=20 a slight drop in fuel flow, not much. Engine driven fuel pump = pressure=20 will be directed toward the engine seal / blow it out and go directly = into the=20 engine crank case. And oil will be diluted as it is contaminated with = fuel.=20

After two or 3 gallons get into the crank case, how = much=20 lubrication do you think that will be?

What if,-- it just happened to ignite as the crank = case=20 overflows out into the turbos? Scary huh?

 

Here's a test. On your next preflight take two = pieces of=20 masking tape, and write "manifold drain" on one and "engine driven = fuel pump"=20 on the other. Get underneath your cowling and put the tape against the = drain=20 line that you believe to match the name on the tape.

Take the cowling off. Make sure that these two = critical lines=20 are properly identified--and installed--and DRY.

 

ANY fuel and out of either of these lines and you = should not=20 fly under any circumstances.

If fuel leaks through the manifold valve diaphragm, = the engine=20 may continue, repeat MAY, continue to run for several minutes with = electric=20 fuel pump on high. But if the diaphragm is split--eventually even high = boost=20 will not hold the valve open in the engine will stop.

 

We are so used to seeing fuel drain from the bottom = of the=20 cowling from the sniffle valve--that we ignore these other two drains = which=20 are critical.

 

Charlie K.

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