X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 06 Dec 2013 09:19:36 -0500 Message-ID: X-Original-Return-Path: Received: from nm26-vm5.bullet.mail.ne1.yahoo.com ([98.138.91.248] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with SMTP id 6627662 for lml@lancaironline.net; Thu, 05 Dec 2013 22:07:49 -0500 Received-SPF: none receiver=logan.com; client-ip=98.138.91.248; envelope-from=chris_zavatson@yahoo.com Received: from [98.138.100.114] by nm26.bullet.mail.ne1.yahoo.com with NNFMP; 06 Dec 2013 03:07:15 -0000 Received: from [98.138.226.126] by tm105.bullet.mail.ne1.yahoo.com with NNFMP; 06 Dec 2013 03:07:15 -0000 Received: from [127.0.0.1] by smtp205.mail.ne1.yahoo.com with NNFMP; 06 Dec 2013 03:07:15 -0000 X-Yahoo-Newman-Id: 739266.11623.bm@smtp205.mail.ne1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: 6.6GVbUVM1m8vb4KgCgBxXea_FOx108cnMe6ohKhEkt7dpa t2eXg3K1ftpqwSgc8WrVlqgoUjdPVxx0emf5QsNJgxMZrzmDM5GwZ6AEAdRG vjePKeD9ohx4qyZ0FyR9WSIzEEPpgVPv8jbfhRvnWlk0FqHMmJ639ZBBJc9v H.G4jPC2C4l2q0_m3E2EYGWVk61oQma0kr.LV8fS7.7ogIHXXt6anZXDycWT 48jCqJ14kl5BDo27WCZzzrJecf1EVPxvvbvKXDJDBWw.VyxVRz8PhmB1wxxa bGnlC1BWmfgxl3mdDrDCvDRM1XOuoOueL4QKDbO898sTFf8LQIXzyo0O.uX4 9J3NIcNMNF42oNiKC9SkDJSjNM0Uedo4YVckCa8e3_cNE0k_hvZH78.06yJC RhHJ_55SBWHqIl3oC3SelLQvX9I6yObgAVUKyVw0lsk1zIwPVa2pgd5XCgIy izPwr0L2IQE9nbmoyahJ679XK8FAODJwsbrIPW38Otrjqm7HcgkG4aW2YvYM Uti5lAIFrtgPzDo873A91IwdCVLCZamuHi70l0Pv51_97R9kcH9pNg2CqhNO rgkrx5X8xdw-- X-Yahoo-SMTP: 076hgjCswBC.G6e0vm7vgvZ9JJ0zmeBo_Oyw X-Rocket-Received: from [10.23.25.108] (chris_zavatson@166.137.215.77 with ) by smtp205.mail.ne1.yahoo.com with SMTP; 05 Dec 2013 19:07:15 -0800 PST Subject: Re: [LML] Re: [LNC2] Front Crankshaft Oil Seal Replacement References: From: Chris Zavatston Content-Type: multipart/alternative; boundary=Apple-Mail-472CC567-326C-485F-B95B-FD7751041C52 X-Mailer: iPhone Mail (9A405) In-Reply-To: X-Original-Message-Id: <7843B2D1-82A6-452B-9811-A125EBFC1743@yahoo.com> X-Original-Date: Thu, 5 Dec 2013 19:07:11 -0800 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-472CC567-326C-485F-B95B-FD7751041C52 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii John, Dow Corning 737 is 'non-corrosive'. I didn't know regular RTV could be corr= osive, but Lycoming appears to think the difference is significant enough to= call out. I would stick with 737, unless I thoroughly understood the chemi= stry and outgassing of a given substitute. Chris Sent from my spiffy iPhone On Dec 5, 2013, at 5:27 PM, John Cooper wrote: > Thanks, Chris! I grabbed Lycoming SI 1324 version A off the Internet which= recommended the Pliobond 20. Thanks for dragging me into the 21st century! I= 'm now wondering if the red Silastic 736 wouldn't work better than the clear= Silastic 737. The red RTV is used to seal automobile water pump tubing,= for example. Engineers! Always trying to re-design stuff! LOL! >=20 >> Rubber will last much longer if submerged in oil. The failure may simply= be due to nothing more than the years of sitting idle. >> In terms of the seal installation, I would recommend using Dow Corning 73= 7 (see SI 1324C, 2009), Pliobond is offered up as an alternative if the 737 i= s not available. After having recently changed a shaft seal, I hi= ghly recommend sticking with the 737, in particular for the do-it-yourselfer= . It provides much more working time and is easier to handle than contact a= dhesive. I can see many A&Ps not wanting to use it because of the longer cu= re time (24 hours). >> Chris Zavatson --Apple-Mail-472CC567-326C-485F-B95B-FD7751041C52 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=utf-8

John,

Dow Corning 737 is 'non-corrosive'. I didn't know regular RTV could be corrosive, but Lycoming appears to think the difference is significant enough to call out. I would stick with 737, unless I thoroughly understood the chemistry and outgassing of a given substitute.

Chris

Sent from my spiffy iPhone

On Dec 5, 2013, at 5:27 PM, John Cooper <snopercod@comporium.net> wrote:

Thanks, Chris! I grabbed Lycoming SI 1324 version A off the Internet which recommended the Pliobond 20. Thanks for dragging me into the 21st century! I'm now wondering if the red Silastic 736 wouldn't work better than the clear Silastic 737. The red RTV is used to seal automobile water pump tubing, for example. Engineers! Always trying to re-design stuff! LOL!

Rubber will last much longer if submerged in oil. The failure may simply be due to nothing more than the years of sitting idle.

In terms of the seal installation, I would recommend using Dow Corning 737 (see SI 1324C, 2009), Pliobond is offered up as an alternative if the 737 is not available. After having recently changed a shaft seal, I highly recommend sticking with the 737, in particular for the do-it-yourselfer. It provides much more working time and is easier to handle than contact adhesive. I can see many A&Ps not wanting to use it because of the longer cure time (24 hours).

Chris Zavatson

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