Return-Path: Received: from [199.185.220.220] (HELO priv-edtnes57.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 794062 for flyrotary@lancaironline.net; Tue, 15 Mar 2005 03:13:38 -0500 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.220; envelope-from=haywire@telus.net Received: from Endurance ([207.81.25.155]) by priv-edtnes57.telusplanet.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with SMTP id <20050315081252.OARZ15957.priv-edtnes57.telusplanet.net@Endurance> for ; Tue, 15 Mar 2005 01:12:52 -0700 From: "Todd Bartrim" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Leaking Mogas Date: Tue, 15 Mar 2005 00:12:36 -0800 Message-ID: <001e01c52936$bfe4e8b0$0201a8c0@Endurance> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001F_01C528F3.B1C1A8B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_001F_01C528F3.B1C1A8B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi Charlie; The stuff I got from Van's 4-5 years ago was made by "Packaging Systems, Inc.). I used the capacitive probes on all of my tanks, so I couldn't see the need to install the access plate so I omitted it, eliminating the need for the cork gasket. I figured that if I ever needed in there I could cut the holes and install the access plates at that time. That time may now be near at hand. I had a couple of pinhole leaks in the past, but I successfully sealed them with green "self wicking" Locktite. It is impervious to fuel and worked easily and quickly and has so far been a permanent fix. But I think the size of this leak is beyond any chance of this working, so a pourable sealant will definitely be in order. I think I'll start with the FlameMaster brand to begin with. Do you recall the part # of the stuff you used? I just went to their web site and they have a large selection with 4 types specifically made for various fuel usage and several others that are more multi-purpose but still list fuel compatibility. If my other tanks are still fine, then it may not be until next winter that I remove this tank for repairs. Thanks. Todd 1st step would be to check the datasheet on whatever sealant you used in the tanks. The Flamemaster brand stuff Van's sells now is supposed to be immune to avgas and mogas. It seems unlikely that a few minutes of exposure would cause such a major leak, even with the old mogas-vulnerable sealant. Did you use access covers on the aux tank like the mains? If so, did you use the cork gaskets? A LOT of people have leaks around the cork gaskets after months or years of flying. I'm just about finished with my RV-7 tanks (remember my aux tank questions about a year ago?) & I had to seal a few leaks. I called Flamemaster to ask about a compatible, pourable sealant & they recommended cs 3600, a 1 part pourable compound. I swapped a few emails with their help person because some of the datasheets indicate use as a pourable 'slosh' type sealant, other (later) datasheets omit that use in the product description. In emails, they maintained its suitability for use on top of the 2 part paste that Van's sells. This stuff is not the same as the milky white stuff that caused so much grief in the past. It's a translucent red color & acts about like pourable contact cement. In fact, the datasheet describes it's primary use similar to contact cement application. I was able to 'inject' it to the problem areas by sucking it into some nylon tubing & routing the tube toward the problem seam before releasing the fluid & then pushing it out of the tube with very low pressure air. I was trying to minimize the unneeded sheeting over large areas of the tank where no holes existed. The tanks now hold air, but it will obviously be a while before I can vouch for long term reliability. ------=_NextPart_000_001F_01C528F3.B1C1A8B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi=20 Charlie;
        The stuff I got = from=20 Van's 4-5 years ago was made by "Packaging Systems, Inc.). I used the = capacitive=20 probes on all of my tanks, so I couldn't see the need to install the = access=20 plate so I omitted it, eliminating the need for the cork gasket. I = figured that=20 if I ever needed in there I could cut the holes and install the access = plates at=20 that time. That time may now be near at=20 hand.
        I had a couple of = pinhole=20 leaks in the past, but I successfully sealed them with green "self = wicking"=20 Locktite. It is impervious to fuel and worked easily and quickly and has = so far=20 been a permanent fix. But I think the size of this leak is beyond any = chance of=20 this working, so a pourable sealant will definitely be in order. I think = I'll=20 start with the FlameMaster brand to begin with.  Do you recall the = part #=20 of the stuff you used? I just went to their web site and they have a = large=20 selection with 4 types specifically made for various fuel usage and = several=20 others that are more multi-purpose but still list fuel=20 compatibility.

  If my other = tanks are=20 still fine, then it may not be until next winter that I remove this tank = for=20 repairs. Thanks.

Todd


1st step would=20 be to check the datasheet on whatever sealant you used in
the tanks. = The=20 Flamemaster brand stuff Van's sells now is supposed to be
immune to = avgas and=20 mogas. It seems unlikely that a few minutes of
exposure would cause = such a=20 major leak, even with the old
mogas-vulnerable sealant. Did you use = access=20 covers on the aux tank like
the mains? If so, did you use the cork = gaskets? A=20 LOT of people have
leaks around the cork gaskets after months or = years of=20 flying.

I'm just about finished with my RV-7 tanks (remember my = aux=20 tank
questions about a year ago?) & I had to seal a few leaks. I=20 called
Flamemaster to ask about a compatible, pourable sealant &=20 they
recommended cs 3600, a 1 part pourable compound. I swapped a few = emails
with their help person because some of the datasheets indicate = use as=20 a
pourable 'slosh' type sealant, other (later) datasheets omit that = use=20 in
the product description. In emails, they maintained its = suitability=20 for
use on top of  the 2 part paste that Van's sells. This stuff = is not=20 the
same as the milky white stuff that caused so much grief in the=20 past.
It's a translucent red color & acts about like pourable = contact=20 cement.
In fact, the datasheet describes it's primary use similar to=20 contact
cement application.

I was able to 'inject' it to the = problem=20 areas by sucking it into some
nylon tubing & routing the tube = toward the=20 problem seam before releasing
the fluid & then pushing it out of = the tube=20 with very low pressure air.
I was trying to minimize the unneeded = sheeting=20 over large areas of the
tank where no holes existed. The tanks now = hold air,=20 but it will
obviously be a while before I can vouch for long term=20 reliability.

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