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 On Jun 21, 2015 9:56 PM, "Sam Salter via CnC-List" <cnc-list@cnc-list.com> wrote: > 2GM20F - I’m about to replace the mixing elbow - got the part. > There’s a pipe joint between the mixing elbow and the exhaust elbow that > screws into both parts. > Do I screw this piece in dry or (more likely) use some sort of sealant? > If I need sealant - what do you guys suggest? > I’ve got a tube of high temp silicone left over from installing my garage > heater, is this stuff OK? If not - what??? > > sam :-) > C&C 26 Liquorice > Ghost Lake Alberta > > > > _______________________________________________ > > 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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