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09-01-2019, 09:26 AM
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Join Date: Oct 2007
Location: Katy, TX
Posts: 138
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NPT fittings and Fuel Lube
Hi all,
Been skipping along with my FWF build installing my NPT fluid fittings using Fuel Lube ( a.k.a. EZ Turn) and recently discovered in a few postings and in Section 5 of my build manual to not use Fuel lube with NPT fittings
So, should I remove all of the NPT fittings and clean them using some sort of solvent or leave it be a see what leaks then address it? Not sure what will clean Fuel lube enough to allow Permatex #2 to do its job. Any words of wisdom would be appreciated for my dumb use of sealants.
Thanks
__________________
Dan Schultz
=VAF= Annual Paid Subscriber
VAF #1446
Slow Building - 7A Tipper
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09-01-2019, 09:32 AM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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Sealant
It is easier to do it now than later...
I use loctite 567...
__________________
Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
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09-01-2019, 09:34 AM
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Join Date: Mar 2017
Location: Glendale, CA
Posts: 253
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Alcohol cleans that well.
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09-01-2019, 09:49 AM
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Join Date: Jan 2005
Location: Clermont, FL
Posts: 565
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I'm not sure why the current thinking is to avoid Fuel Lube. I've never used anything else on NPT fittings and never had a leak or other issue with them. Yes, it would be a problem if someone sloppily got the stuff past the threads such that a glob could enter the hose/pipe bore, but that's a technique issue vs. a problem with the material.
__________________
Ken
RV-8 N118KB (#81125) - Sold
RV-14A N114KB (#140494) - Sold
RV-14A.com
N114KB Build Site
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09-02-2019, 05:52 AM
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Join Date: Jul 2012
Location: n. wi
Posts: 778
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fwiw
i put permatex #1 or 2 on a piece of metal and a week later cleaned it up with gasoline.i called permates and got an ''old timer'' there that confirmed neither #1 or #2 was truly gas proof. something about since laws prohibiting use of a compound extracted from trees.
i do know i have heard of a lot of guys using it.
another fwiw......a company that does gas pump installations and repairs for service stations uses ''gasoila'' on the pipe fittings.
i have always used #567 and never had a leak.
__________________
Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12. in the hangar now as of 10/15/19
RV-12 kit as of 9/13
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09-02-2019, 07:02 AM
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Join Date: Dec 2007
Location: Brentwood, CA
Posts: 659
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Truly discussed at length here on VAF. If you read section 5.27 of your drawings from Van’s, they list Permatex #2 and Tite-seal, but also suggest “others with success”. You can’t go wrong with Permatex #2, which I’ve used extensively in my work over many years, but also on airplanes.
And while some folks use Loctite 567, which a great sealant/locker, it is Loctites general thread sealant that will definitely do the job well, but was initially designed for stainless threads with a permanent installation in mind.
The specific Loctite for hydraulic lines, including oil, brakes and fuel, is 565. It will also minimize galling and I highly recommend it if you ever think you’ll pull those aluminum NPT fittings apart sometime in the life of the airplane.
Just to be clear, don’t use sealants on flared fittings - a couple of drops of light oil (think air tool oil) on those work well.
I personally only use EZ-Turn on applications where metal meets rubber, such as fuel drains in rubber bladders; that really is it’s target application.
To directly answer your question, I personally would go back through where you’ve used EZ-Turn on NPT fittings, remove clean (thoroughly with denatured alcohol) and install with Loctite 565. It’s also easier to do now than later when you find that hard to reach fitting leaking.
__________________
Ron Gawer
- RV10, Build in progress.
- RV12, N975G, "The Commuter"...many great hours and happy landings so far.
- Several others that are now just great memories for me.
Last edited by rongawer : 09-02-2019 at 07:10 AM.
Reason: clarification
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09-02-2019, 07:11 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Anecdotal Story
More than 45 years ago I discovered the wonder of Permatex Aviation #3 and it became my go-to sealant all those years for anything NPT. I used it for gasket and gasket-less (VW cases) with perfect success. Hundreds of dry engine overhauls and thousands of other applications attested to my golden find.
I continued with #3 on the RV7, but had two failures, both on 1/8" NPT. The sensor block and brakes. I think the special ROYCO fluid dissolved it on the brakes.
I have no technical explanation as to why #3 has failed, but for now, for the airplane, 567 is my standard.
#3 is dissolved by any alcohol, but not touched by anything petroleum. #2 is the same but more pasty.
EDIT: Interesting comment on the 565, Ron, I will check into that.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Last edited by BillL : 09-02-2019 at 07:14 AM.
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09-02-2019, 09:32 AM
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Join Date: Jan 2005
Location: Clermont, FL
Posts: 565
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Quote:
Originally Posted by rongawer
I personally only use EZ-Turn on applications where metal meets rubber, such as fuel drains in rubber bladders; that really is it?s target application.
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Can you cite an authoritative reference for this claim? I've been all through the tech data sheets over the years and don't recall a single specific reference to metal/rubber interfaces. At the same time, the product is advertised as being suitable for anti-seize, anti-galling, and threaded fastener (such as NPT fittings) applications.
There's absolutely nothing wrong with the stuff and I've found it to be ideal for use with NPT fittings.
__________________
Ken
RV-8 N118KB (#81125) - Sold
RV-14A N114KB (#140494) - Sold
RV-14A.com
N114KB Build Site
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09-02-2019, 09:39 AM
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Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,458
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Quote:
Originally Posted by RicoB
Alcohol cleans that well.
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?. Seems a terrible waste of good alcohol!  
I think I would leave it as it has always worked flawlessly for me. 
__________________
Allan Nimmo
AntiSplatAero.com
Innovative Aircraft Safety
Products, Tools & ServicesInfo@AntiSplatAero.com Southern California (KREI)
RV-9A / Edge-540 
(909) 824-1020
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09-02-2019, 10:06 AM
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Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,433
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I've used both EZ Turn and Tite Seal with no issues at all. Much ado about nothing. Any of them will work fine if you apply them correctly and thread the fitting in correctly.
__________________
RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
www.marksrv8.com
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