X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 17 Aug 2010 13:09:44 -0400 Message-ID: X-Original-Return-Path: Received: from imr-ma05.mx.aol.com ([64.12.100.31] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4433961 for lml@lancaironline.net; Tue, 17 Aug 2010 10:34:01 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.100.31; envelope-from=Sky2high@aol.com Received: from imo-da04.mx.aol.com (imo-da04.mx.aol.com [205.188.169.202]) by imr-ma05.mx.aol.com (8.14.1/8.14.1) with ESMTP id o7HEXKh2031280 for ; Tue, 17 Aug 2010 10:33:20 -0400 Received: from Sky2high@aol.com by imo-da04.mx.aol.com (mail_out_v42.9.) id q.d45.675cab22 (43991) for ; Tue, 17 Aug 2010 10:33:16 -0400 (EDT) Received: from magic-m27.mail.aol.com (magic-m27.mail.aol.com [172.20.22.200]) by cia-dd05.mx.aol.com (v129.4) with ESMTP id MAILCIADD058-abd74c6a9dac9a; Tue, 17 Aug 2010 10:33:16 -0400 From: Sky2high@aol.com X-Original-Message-ID: <5e3b3.5735a9e5.399bf7ac@aol.com> X-Original-Date: Tue, 17 Aug 2010 10:33:16 EDT Subject: Re: [LML] Re: LNC2 Fuel Caps X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_5e3b3.5735a9e5.399bf7ac_boundary" X-Mailer: AOL 9.5 sub 155 X-AOL-IP: 24.15.17.119 X-Spam-Flag:NO X-AOL-SENDER: Sky2high@aol.com --part1_5e3b3.5735a9e5.399bf7ac_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Angier, The original UD-3 caps (circa 1989) had a flat aluminum surface and a nylon(? or teflon) wedge between which the o-ring was squeezed to expand against the fuel opening neck. These were terrible. Newer UD-3 caps (since about 1997) had both upper and lower nylon wedges that squeezed the o-ring out. These are much better. However, fuel or time may dry the surfaces so much that the o-ring doesn't get pushed out properly on either cap type. Occasionally a squirt of silicon lubricant on the cap moving parts and ring will help correct that condition. It also makes it easier to close the cap tab. If the cap is too hard to close, the roll pin axle can be sheared (I told you guys I have made almost every possible mistake). You can always buy fuel resistant o-rings to replace your old ones. Also note that there was no part number change between the old and new style caps. Grayhawk PS You have added a safety chain between the tank and the cap so it can't be lost, haven't you? In a message dated 8/17/2010 9:10:52 A.M. Central Daylight Time, N4ZQ@comcast.net writes: One of my three fuel caps appears to have an O-ring which is stiffer (header tank) than those on the wings. It closes ok but the tab no longer sits flush with the cap surface. I'm wondering whether the O- rings which came with the original kit are now beyond their useful life. (not from flight time but build time)... From your experience, how frequently should they be swapped out in the field? Angier Ames N4ZQ -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html --part1_5e3b3.5735a9e5.399bf7ac_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Angier,

The original UD-3 caps (circa 1989) had a flat aluminum surface= and a=20 nylon(? or teflon) wedge between which the o-ring was squeezed to expand= against=20 the fuel opening neck. These were terrible.

Newer UD-3 caps (since about 1997) had both upper and lower nylo= n=20 wedges that squeezed the o-ring out. These are much better.

However, fuel or time may dry the surfaces so much that the o-ring do= esn't=20 get pushed out properly on either cap type. Occasionally a squirt of= =20 silicon lubricant on the cap moving parts and ring will help cor= rect=20 that condition. It also makes it easier to close the cap tab. = If the=20 cap is too hard to close, the roll pin axle can be sheared (I told you guy= s I=20 have made almost every possible mistake).

You can always buy fuel resistant o-rings to replace your old ones.

Also note that there was no part number change between the old and ne= w=20 style caps.

Grayhawk

PS You have added a safety chain between the tank and the cap so it= can't=20 be lost, haven't you?

In a message dated 8/17/2010 9:10:52 A.M. Central Daylight Time,=20 N4ZQ@comcast.net writes:

One of=20 my three fuel caps appears to have an O-ring which is stiffer =20
(header tank) than those on the wings. It closes ok but the tab no&n= bsp;=20
longer sits flush with the cap surface. I'm wondering whether the O-= =20
rings which came with the original kit are now beyond their useful&n= bsp;=20
life. (not from flight time but build time)...
From your experien= ce,=20 how frequently should they be swapped out in
the=20 field?

Angier Ames
N4ZQ

--
For archives and unsub=20 http://mail.lancaironline.net:81/lists/lml/List.html

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