fuel outlet (not sender) gasket 610261-001

[tmo]

Greetings from Poland!

Seems I have a minor fuel seep on the fuel outlet on one wing; the seepage is evident both by blue stains and by avgas smell. It seems to come through both the 4 screws that attach it, and the gasket itself. The IPC lists the gasket as pn 610261-001 (section 28-20-00, part of item 58).

Lasar want $65 for one, but also refer to 462-021, which seems to be a gasket for a fuel sender (bigger hole inside, 5 screws). Pretty expensive, and a long wait for me, with shipping to Poland.

Two questions:

 - the gasket doesn't seem to be particularly complicated, so I am wondering if I could just OPP one, and if so, what would you suggest to use as the source material?

 - should I use some kind sealant on the screws, or a washer from the same material the gasket is made of?

Any and all suggestions greatly appreciated!

[Fly Boomer]

Back in the day, I used to use something like this.  That said, I see that Fel-Pro has quite a variety of gasket materials, so perhaps there is another that is more suitable for fuel.

https://www.amazon.com/Fel-Pro-3047-Gasket-Material/dp/B000CNISLI/ref=sr_1_4?keywords=Gasket+Paper&qid=1647473633&sr=8-4

EDIT:  For clarity, "back in the day" I was working on cars.

[N201MKTurbo]

Just take it off, remove the gasket and put it back on with fuel tank sealant. It will coat like 40 zloty. It will never leak again.

[carusoam]

TMO,

Got a pic of the fuel outlet of your M20K?

 

Stay safe, in your part of the Mooney world!

Best regards,

-a-

[Guest]

7 hours ago, GEE-BEE AEROPRODUCTS said:

My wrench would never do that or would I allow such half ass work .

Typical work based on cost , if you can’t afford a new gasket , how do you afford to own and maintain a aircraft.

This is why the fleet looks like it does 

More hack work on a aftermarket exhaust system…..

My wrench uses approved parts, please post the approval for these gaskets.

Clarence

[Guest]

16 hours ago, tmo said:

Greetings from Poland!

Seems I have a minor fuel seep on the fuel outlet on one wing; the seepage is evident both by blue stains and by avgas smell. It seems to come through both the 4 screws that attach it, and the gasket itself. The IPC lists the gasket as pn 610261-001 (section 28-20-00, part of item 58).

Lasar want $65 for one, but also refer to 462-021, which seems to be a gasket for a fuel sender (bigger hole inside, 5 screws). Pretty expensive, and a long wait for me, with shipping to Poland.

Two questions:

 - the gasket doesn't seem to be particularly complicated, so I am wondering if I could just OPP one, and if so, what would you suggest to use as the source material?

 - should I use some kind sealant on the screws, or a washer from the same material the gasket is made of?

Any and all suggestions greatly appreciated!

I would drain the tank, remove the outlet fitting and gasket to see what material it is, then copy it.

Clarence

[tmo]

Thanks, all.

@GEE-BEE AEROPRODUCTS - sending a flat piece of gasket off to sunny CA for duplication doesn't make sense to me, due to the turnaround time. With all due respect, I think I can find a shop that will be able to do it for me, or, even do it myself - it's a flat piece of gasket, not some convoluted 3D shape. That said, when the time comes, I will be buying your baffling and possibly hoses.

@N201MKTurbo - that would be true if I had some tank sealant around I do not, and this is Cessna (and Tecnam) country so I'm SOL. But I think I am going to need to find some avgas-compatible sealant to put on the screw threads, as they seem to be seeping too.

@carusoam - as a matter of fact I do will post down below, but it seems to me we're close to solving this gasket thing; we're staying safe, thanks, and trying to help those less fortunate, that are taking the heat this time around; as you know, it is a team effort, with all of the civilized world pitching in, we just happen to be right next door.

@M20Doc - this is almost exactly what I want to do, but I wanted to use a modern day material, instead of trying to figure out what Mooney used in 1980.

So, to summarize, fluorosilicone is the material I want to duplicate in, correct? I was thinking nitrile rubber (NBR) should also work, we use it on cars, and I should have a sheet or three somewhere in the garage. Thoughts?

[tmo]

Here is a picture Anthony asked for; the fuel sender is just above. Yes, I'll replace the hose bit as well, we have just enough left over from some Piper the guys were doing a few weeks back.

Edited March 17, 2022 by tmo

[N201MKTurbo]

I would use CS3330 B2 to seal the screws, you can use it in place of the gasket too.

http://flamemaster.com/wp-content/uploads/2014/07/CS3330B-05-2008.pdf

 

Edited March 17, 2022 by N201MKTurbo

[carusoam]

Are there torque specs to go with the various materials being suggested…?

Or just the standards in the maintenance manuals…

PP thinking out loud…

Best regards,

-a- 

[Guest]

19 hours ago, GEE-BEE AEROPRODUCTS said:

MADE TO SAMPLE , SOLD WITH CERTS, FUNNY YOU HAVE ORDERED BEFORE AND THAT WAS THE END OF THAT

I’ve tried your knock off rocker gaskets on my experimental RV4, in my experience they didn’t hold up as well as either the Lycoming cork or their new silicone, or the Real Gasket company versions.  As for buying your pre cut baffle seals most of us have no issue using them.  An air leak in an air cooled engine is quite a different matter than an oil or fuel leak caused by an un approved part.  

Clarence

[cbarry]

I’m not a mechanic, but I venture to say the gasket may not be the only culprit.  It may be that the sealant on the tank side of the port’s screws may have a deteriorating area on the nut plate. Or At some point, someone could possibly have put sealant on the tip of the screw/s and then forced it out the back side and refilled the tank before the sealant cured enough.  

[rrodriguzzi1]

That looks like damaged dome nuts. Probably somebody at some point used the wrong size screws.  

[rrodriguzzi1]

That looks like damaged dome nuts. Maybe and depending on when it started at some point somebody probably used the wrong size screws damaging the domenut. That’s off an access panel, but I see a possibility that this could be your problem.