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Tim Juhl
Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan
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 Posted: Wed Feb 09, 2011 7:50 pm Post subject: Thread lube for fuel filler |
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I've started a new thread to discuss the topic of thread lubes for installing the fuel filler neck. If you followed the post on "Removing fuel filler neck" you'll see where I recently had to cut mine out while trying to get left wing apart for modification. I had a problem with threads galling when I first test fit the filler neck to one of my tanks and had to cut that neck out too and borrow the "big tap" from Zenith. I never thought I'd find myself doing it again.
I had no problems removing and reinstalling the neck on the first wing I modified but the second wouldn't budge. During original assembly I cleaned the threads of both tank necks out with the "big tap" and used Permatex High Performance thread sealer on the screw-in portion.
I know the subject of thread sealers has been covered before but some time has passed and I thought it would be worthwhile to pose the question again.
Before I reinstall the filler neck I need to decide what to use as a thread lube. So far I've heard 1.) Permatex High Performance Thread Lube (that's what I used last time with 50% success) 2.) Aviation Form-a-gasket 3.) EZ Turn (fuelube) & 4.) Bakerseal - I suspect #1 & 4 are similar in composition but can't say for sure. I'm not sure of the anti-galling properties of #2 although I have used it on fuel fittings before. #3 I have no experience with.
At this point I'm leaning towards trying the EZ Turn - it's formulated for aviation fuels. Nonetheless, I'd like to hear from others about their experience with various products. Heaven forbid I ever have to open the leading edge again but if I do I'd like to do so without having to use a hacksaw.
Tim
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Champ L16A flying
Zodiac XL - Jabiru 3300A
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MHerder
Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX
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| Posted: Thu Feb 10, 2011 6:31 am Post subject: Re: Thread lube for fuel filler |
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Fuel Lube/EZ lube is what I used. It is thick, and extremely difficult to get off your hands especially if it's cool or cold. Haven't had to remove my caps, but I think that I could??? I'd find it hard to believe that that stuff would allow any corrosion, its thick nasty stuff which means it's probably good.
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Zodiac 601 HD
Jabiru 3300
Wood Sensinich 64x47
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Ron Lendon
Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
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| Posted: Thu Feb 10, 2011 7:27 pm Post subject: Re: Thread lube for fuel filler |
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Tim, Fuel Lube is the way to go. I had to cut one of mine out also but that was during the fabrication process. I used the filler neck to align and hold in place. after welding the inner, the filler neck was frozen in place. I used fuel lube after and have since done the upgrade, they came right out.
On another note the CZAW plane had some white sealer on them and it took two men two hours to coax them out. We used the big tap and fuel lube after that. it was recommended by a APII.
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Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
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DaveG601XL
Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh
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| Posted: Fri Feb 11, 2011 3:54 am Post subject: Re: Thread lube for fuel filler |
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Tim,
My experience was like yours. I had a 50% success rate in getting my fuel filler necks off for the mods. I used the permatex sealant but probably used it on more threads than really necessary. When I re-installed the filler necks, I made sure to only use the permatex on the last group of threads. Now I will not know how well I have set myself up for future removals, and I hope not to have to test it any time soon. The amount of sealant was adequate to seal the threads during last years flying season.
Whatever you use, just use it sparingly.
Good luck,
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David Gallagher
Cincinnati, OH area |
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jaybannist(at)cs.com
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| Posted: Fri Feb 11, 2011 6:26 am Post subject: Thread lube for fuel filler |
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When I ordered the stuff to make up fuel hoses from Summit Racing, one of the things recommended was an anti-seize compound. I used what was provided (a blue paste) on all the aluminum threaded connections. I had to un-do several connections and had no trouble. Has anyone tried this stuff on the fuel filler neck threads?
Jay
[quote][b]
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dgardea(at)gmail.com
Joined: 26 Mar 2007
Posts: 50
Location: Indianapolis, IN
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| Posted: Fri Feb 11, 2011 4:57 pm Post subject: Re: Thread lube for fuel filler |
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Fuel lube (EZ Turn) is what I used. I was able to remove the filler necks easily when I did the upgrade to each wing. I also used liberal amounts of fuel lube on top of the fuel senders on the end of each tank. I have not had any leaks yet with the few gallons of 100LL I have in each tank.
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Dave Gardea
CH650 - Corvair - flying!
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