I stopped using teflon tape in the 80's after finding the threads of tape caught inside valves downstream. I saw many failures when teflon tape or teflon pipe dope was used on diesel fuel lines. Some pipe dopes (read the directions) require the joint sit for 24 hrs before charging the system w fuel.
I recommend Hercules Megalok, it's a light blue pipe dope that works on everything, oil, gasoline, diesel fuel, water, oxygen, natural gas, propane, etc, without waiting. I've been using the same can of dope for so long, I can't read the label. Good stuff. http://www.oatey.com/doc/megaloc.pdf Chuck Resolute 1990 C&C 34R Broad Creek, Magothy River, Md ----- Original Message ----- From: "Josh Muckley via CnC-List" <cnc-list@cnc-list.com> To: "C&C List" <cnc-list@cnc-list.com> Cc: "Josh Muckley" <muckl...@gmail.com> Sent: Tuesday, June 23, 2015 10:37:48 AM Subject: Re: Stus-List Mixing Elbow - 2GM20F Yeah maybe it was short sided to use tape but the point was to "lubricate" the threads and allow a tight enough connection. It is in fact tight enough because my air filter now stays clean. Like i said, I may play hell getting it apart should the need arise. As for fumes, i haven't noticed any.... Josh On Jun 23, 2015 7:40 AM, "Bill Bina - gmail via CnC-List" < cnc-list@cnc-list.com > wrote: I know That teflon tape is not used in fuel oil heating system lines because the fuel dissolves teflon tape. Bill Bina On 6/23/2015 12:38 AM, Russ & Melody via CnC-List wrote: <blockquote> Hi Josh, Good point made regarding tapered thread sealing qualities and the lube aids to obtaining a good mechanical seal. I'm a little dismayed that you used Teflon tape on the exhaust fittings. This is probably the worst application for the product (second being any system with a pump in it). It is best used in domestic water situations. At about 660 degrees F Teflon tape decomposes and emits a toxic fume. Fatal to birds in the home when the frying pan gets too hot and probably not good for humans in a small space either. I whole heartedly support the use of high temp anti-seize. It might stink a wee bit on the first couple of runs but it probably won't harm you. Cheers, Russ Sweet 35 mk-1 At 04:08 AM 22/06/2015, you wrote: <blockquote> Most if not all pipe dopes and Teflon tape sealers are not really there to "seal" the threads of a NPT fitting from leaking. They are simply there to lubricate the threads so a sufficiently tight connection can be made. The lubricant may also help in disassembly. By design the mechanical compression as a result of the tapered threads is what is actually supposed to prevents leaks. Yes, you can use all manner of sealants which may "help" but a proper NPT connection shouldn't need it. That being said, I used Teflon tape on my exhaust (3GM35F). Just 2 wraps. I may have difficulty getting the joint apart, who knows. I also used a bench vice to provide enough counter-torque. As a suggestion I would give high temp anti-seaze a try. It is usually copper colored and most auto parts stores should carry it. If you've ever replaced an O2 sensor they include a small tube. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD </blockquote> _______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com </blockquote> _______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
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