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  #1  
Old 01-28-2021, 01:13 PM
Meat Meat is offline
 
Join Date: Jan 2018
Location: Glendale, AZ
Posts: 23
Default Andair Fuel Valve and Loctite 648. Why?

Hi All,

I've got the standard Andair FS20x2 fuel selector valve on my RV-14. Andair is very specific that the #4 screws used on the fittings are to be secured with Loctite 648. I was unfamiliar with this particular Loctite product and looked it up. Unlike the traditional blue and red Loctite threadlockers, Loctite 648 is a retaining compound for close tolerance cylindrical parts. It doesn't seem appropriate for use a threadlocker.

Does anyone know why this product is recommended for the fuel fitting machine screws vs traditional threadlockers? I've got an email into Andair as well.

Thanks for your time.

Cheers,

Scott
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  #2  
Old 01-28-2021, 01:39 PM
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Mike S Mike S is offline
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
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Green locktite is sometimes used for weeping rivets.

May have something to do with resistance to fuel?
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Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

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Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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Old 01-28-2021, 02:01 PM
MED MED is offline
 
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I believe it is because it is “permanent.” The alternative offered to the loctite is staking the screws!
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Old 01-28-2021, 02:12 PM
Mckay Mckay is offline
 
Join Date: Dec 2019
Location: Prescott, Az
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Green Loktite is wicking, it will seep into very small clearances.
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Old 01-28-2021, 05:23 PM
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9GT 9GT is offline
 
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Location: Southern Michigan
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Andair has been in the business a long time and produces high quality products. Like anything else, you usually can't go wrong when you follow manufacturer's directions and installation specifications.
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Howell, MI
RV-10: #41686 Under Construction
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  #6  
Old 01-28-2021, 09:20 PM
Meat Meat is offline
 
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Location: Glendale, AZ
Posts: 23
Default Loctite 648

I'm just curious more then anything else. I'm sure there's a good reason why its recommended. Fuel resistance, its ability to weep into tight tolerances, etc.

Can anyone comment on how difficult the -648 makes it to remove the #4 fuel fitting screws if needed?

Cheers,

Scott
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