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An fittings

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flyingmike9

Joined: 09 Dec 2006
Posts: 33
Location: England

Posted: Sun Jul 08, 2007 9:18 am Post subject: An fittings

hello group

installing my gascolator and fuel pump today will be using Rotax engine 

my question is when using AN fittings  do you have to use sealant to seal the fittings i am using collars and nuts with 5/16 alu tube or is the collar what is needed the 5/16 tube has been flare also 



thank you 

mike lloyd

601xl fuse 80%

rotax912

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planejim(at)bellsouth.net
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Posted: Sun Jul 08, 2007 10:08 am Post subject: An fittings

Mike,



Normally there is no sealer used when fitting a flared tube, with the proper 

collar, to an AN fitting. If the flare has been properly done ( be carefull 

here since auto flaring tools make a different angle than do aircraft 

flaring tools ) and there is no damage to the fitting or the end of the tube 

these connections are not much of a problem when properly tightened. Be 

carefull with alignment also. If it leaks there is usually a mechanical 

problem causing it.



On occasion, I've used sealer on the pipe thread end of an AN fitting, but 

normally this isn't necessary either. Sometimes, when installing a AN 

fitting that is an elbow, and to get it to point the correct way, before 

becoming fully tight upon installation,  I've used a sealant on the pipe 

threads. Don't use plumbers "Ribbon Dope" unless you are very carefull. It 

doesn't take much of this to clog up a filter, carb jet or some kind of 

orfice. If you do use a sealant on a pipe thread, don't put it near the end 

of the fitting for the same reasons stated above.



Hope this little bit of info helps.



do not archive



Jim Hoak

---

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flyingmike9

Joined: 09 Dec 2006
Posts: 33
Location: England

Posted: Sun Jul 08, 2007 10:19 am Post subject: Re: An fittings

excellent 

thank you very much i do have the correct flaring tool 37degree type



have uesd fuelube sealant on the threads this helps for the alu to alu fittings 

but thank you for you help 



mike

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