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Torqueing AN-818 flare fittings

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gerf(at)gerf.com
Guest

Posted: Thu Nov 30, 2006 11:04 am Post subject: Torqueing AN-818 flare fittings

I've found the torque limits table in AC43.13 for setting the 

torque on AN818 flare nuts.  There are 2 section one for 

aluminum tubing and one for steel.



Lets take the example of the oil lines from the oil cooler to 

the engine in the RV-9 firewall forward kit.  They supply 

aluminum 45 degree pipe-to-flare fittings for the oil cooler 

and what I think are steel hoses to connect to the engine.  

Where the hose connects to the 45 degree fitting on the oil 

cooler should I use the chart for aluminum or steel ?



Similarly my firewall bulkhead fittings for the fuel lines are 

aluminum, but the ends of the Stratoflex hoses are steel - 

which torque chart governs - the alum or steel ?



(I just know someone is going to say "Change all the alum 

fittings for steel ones and use the steel table" :-/)



__g__



========================================================== 

Gerry Filby                                  gerf(at)gerf.com

----------------------------------------------------------

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brianpublic2(at)starband.
Guest

Posted: Thu Nov 30, 2006 11:58 am Post subject: Torqueing AN-818 flare fittings

In my opinion (and practice) you want to torque to the lower of the 2

possible values when you have mixed steel and aluminum.  This is because one

of the 2 halves of the nut/fitting has aluminum threads, and you don't want

to overstress them by using steel torque values

Example - steel nuts on Teflon oil lines, aluminum oil cooler thermostat:

http://brian76.mystarband.net/engineOct06.htm#oct31

brian

RV-7A working on Eggenfellner engine & related components

http://brian76.mystarband.net/RV-7Ahome.htm

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