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brake / fuel line fittings nut torque

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hotwheels

Joined: 01 Jun 2007
Posts: 240

Posted: Wed Jun 13, 2007 6:45 am Post subject: brake / fuel line fittings nut torque

How tight should the nuts be on the brake / fuel line fitting nuts?



Thanks in advance for replies...

Regards,

Jay



       

Be a better Globetrotter. Get better travel answers from someone who knows. Yahoo! Answers - Check it out.

http://answers.yahoo.com/dir/?link=list&sid=396545469

scottmschmidt(at)yahoo.co
Guest

Posted: Wed Jun 13, 2007 8:50 am Post subject: brake / fuel line fittings nut torque

That is a very good question. I have asked this quite a few times and I get a different answer every time.  

 From what I have researched there is no specific torque values.  When I toured Lancair, the engine builder there told me to tighten it until it was snug (you can feel with when the flared fitting is touching both sides of the fitting and nut) then go an additional 1/4 to 1/2 turn.  

  

 Other comments I have received are:

 "Just tight enough that it won't leak"

 "Just snug it up and check for leaks"

  

 I actually made some fittings on the bench, tightened them up then took them apart to check for any tearing or excessive deformation and sort of calibrated myself.  I know that it is more important to have a top of the line flaring tool and to also not over or under flare the tubing.

  

 You may want to call Bart at Aerosport and ask him.  

  

 Good Luck.  

 

 

Scott Schmidt 

scottmschmidt(at)yahoo.com 



 ---

ScooterF15

Joined: 19 Jun 2006
Posts: 136

Posted: Wed Jun 13, 2007 9:38 am Post subject: brake / fuel line fittings nut torque

I think the torque values are listed in my copy  of Standard Aircraft Handbook for Mechanics and Technicians. I don't have  access to it right now so I can't tell you what it  says. 

  

 I used those values and ended up with some leaks  so I tightened them "Just tight enough that it won't leak" and then started  the practice of "Just snug it up and check for leaks". With further experience  with a particularly annoying brake line leak, I found "tightening and loosening  the nut several times before torquing it helped to achieve a tight  seal". So there is one more comment to add to the list.

  

 -Jim

 40134

  

 In a message dated 6/13/2007 12:53:04 P.M. Eastern Daylight Time,  scottmschmidt(at)yahoo.com writes:

  	  Quote: 	
		     That is a very good question. I have asked this quite a few times    and I get a different answer every time.  

   From what I have researched there is no specific    torque values.  When I toured Lancair, the engine builder there    told me to tighten it until it was snug (you can feel with when    the flared fitting is touching both sides of the fitting and nut) then go    an additional 1/4 to 1/2 turn.  

    

   Other comments I have received are:

   "Just tight enough that it won't leak"

   "Just snug it up and check for leaks"

    

   I actually made some fittings on the bench, tightened them up    then took them apart to check for any tearing or excessive deformation    and sort of calibrated myself.  I know that it    is more important to have a top of the line flaring tool and to also    not over or under flare the tubing.

    

   You may want to call Bart at Aerosport and ask him.  

    

   Good Luck.  

 

   

Scott Schmidt   

scottmschmidt(at)yahoo.com   



   -----    Original Message ----

From: Jay Brinkmeyer    <jaybrinkmeyer(at)yahoo.com>

To: RV10    <rv10-list(at)matronics.com>

Sent: Wednesday, June 13, 2007 7:44:01    AM

Subject: brake / fuel line fittings nut    torque

	


 



  

 Jim "Scooter"  McGrew

http://www.mit.edu/~jsmcgrew



See what's free at AOL.com. 

  [quote][b]

pitts_pilot(at)bellsouth.
Guest

Posted: Wed Jun 13, 2007 10:55 am Post subject: brake / fuel line fittings nut torque

Jay Brinkmeyer wrote:



 	  Quote: 	
		  



How tight should the nuts be on the brake / fuel line fitting nuts?



Tight enough not to leak.   .  I tighten to 'fairly snug'.
	


Linn

do not archive



 	  Quote: 	
		  

Thanks in advance for replies...

Regards,

Jay



       

Be a better Globetrotter. Get better travel answers from someone who knows. Yahoo! Answers - Check it out.

http://answers.yahoo.com/dir/?link=list&sid=396545469

LarryRosen

Joined: 16 Jan 2006
Posts: 415
Location: Medford, NJ

Posted: Wed Jun 13, 2007 12:08 pm Post subject: brake / fuel line fittings nut torque

Is there a way to test the systems prior to completion?  I have most of 

the break lines in, but since the plane is not on its gear yet it is not 

complete, How do I test it.



Same with the fuel system.  How do I test it with out the fuel tanks?



Larry Rosen



linn Walters wrote:

 	  Quote: 	
		   



 Jay Brinkmeyer wrote:



> 

> <jaybrinkmeyer(at)yahoo.com>

>

> How tight should the nuts be on the brake / fuel line fitting nuts?

>

 Tight enough not to leak.   .  I tighten to 'fairly snug'.

 Linn

 do not archive



>

> Thanks in advance for replies...

> Regards,

> Jay

>

>       Be a better Globetrotter. Get better travel answers from 

> someone who knows. Yahoo! Answers - Check it out.

> http://answers.yahoo.com/dir/?link=list&sid=396545469

>

>  

>

_________________
Larry Rosen
#40356
N205EN (reserved)
<http>

MauleDriver(at)nc.rr.com
Guest

Posted: Wed Jun 13, 2007 1:33 pm Post subject: brake / fuel line fittings nut torque

I recently bought a torque wrench for sockets.  I don't see how it would 

work on a line fitting.  Does this require a different type of torque 

wrench?



JSMcGrew(at)aol.com wrote:

 	  Quote: 	
		   I think the torque values are listed in my copy of Standard Aircraft 

 Handbook for Mechanics and Technicians. I don't have access to it 

 right now so I can't tell you what it says. 

  

 I used those values and ended up with some leaks so I tightened them 

 "Just tight enough that it won't leak" and then started the practice 

 of "Just snug it up and check for leaks". With further experience with 

 a particularly annoying brake line leak, I found "tightening and 

 loosening the nut several times before torquing it helped to achieve a 

 tight seal". So there is one more comment to add to the list.

  

 -Jim

 40134

Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Wed Jun 13, 2007 1:42 pm Post subject: brake / fuel line fittings nut torque

Check out 'crows foot/feet' at you favorite tool supplier. They're open 

end wrench extensions designed to be used on a socket wrench.

WRT to torque, depending on how you use them, their use requires some 

arithmetic conversion, as they can extend the 'arm' that is applying the 

torque.



Deems Davis # 406

Baffling / Plenum / Engine Stuff

http://deemsrv10.com/



MauleDriver wrote:

 	  Quote: 	
		   



 I recently bought a torque wrench for sockets.  I don't see how it 

 would work on a line fitting.  Does this require a different type of 

 torque wrench?

planesmith(at)hotmail.com
Guest

Posted: Wed Jun 13, 2007 8:30 pm Post subject: brake / fuel line fittings nut torque

I've been testing my brake lines, as I build them, with a handheld vacuum pump. Just plug one end of a line and pull a vacuum at the other with a hand operated Mitivac. I figure if they will hold a vacuum they should hold brake fluid. 

 If you go this route, I think Mitivacs are available through a number of sources (Aircraft Tool Supply and automotive outlets as well.) I've as heard the aluminum ones hold up better than the plastic bodies.

 Vern Smith (#324 fuselage)

 	  Quote: 	
		   Date: Wed, 13 Jun 2007 16:07:55 -0400

 From: LarryRosen(at)comcast.net

 To: rv10-list(at)matronics.com

 Subject: Re: brake / fuel line fittings nut torque

 --> RV10-List message posted by: Larry Rosen <LarryRosen(at)comcast.net>

 Is there a way to test the systems prior to completion? I have most of 

 the break lines in, but since the plane is not on its gear yet it is not 

 complete, How do I test it.

 Same with the fuel system. How do I test it with out the fuel tanks?

 Larry Rosen

 linn Walters wrote:

 > --> RV10-List message posted by: linn Walters <pitts_pilot(at)bellsouth.net>

 >

 > Jay Brinkmeyer wrote:

 >

 >> --> RV10-List message posted by: Jay Brinkmeyer 

 >> <jaybrinkmeyer(at)yahoo.com>

 >>

 >> How tight should the nuts be on the brake / fuel line fitting nuts?

 >>

 > Tight enough not to leak.  . I tighten to 'fairly snug'.

 > Linn

 > do not archive

 >

 >>

 >> Thanks in advance for replies...

 >> Regards,

 >> Jay

 >>

 >>

 >>

 >> Be a better Globetrotter. Get better travel answers from 

 >> someone who knows. Yahoo! Answers - Check it out.

 >> http://answers.yahoo.com/dir/?link=list&sid=396545469

 >>

 >>

 >>

 >>

 >>

 >> 

 >>

 >

 >

 >

 >

 >

 >

 >> 

Hotmail to go? Get your Hotmail, news, sports and much more!   Check out the New MSN Mobile  [quote][b]

Rick S.

Joined: 12 Feb 2006
Posts: 347
Location: Las Vegas

Posted: Thu Jun 14, 2007 5:33 am Post subject: brake / fuel line fittings nut torque

LOL....well not if the molecules of air are larger than that of the brake fluid taking into consideration of the expansion of the air (mostly nitrogen) molecules under vacuum vs. the size of the brake fluid molecules under pressure.



After all the fuel tank leak physics must apply somewhere in this too right?  ;D



Rick S.

40185



do not archive

_________________
Rick S.
RV-10
40185

flywithowen(at)gmail.com
Guest

Posted: Thu Jun 14, 2007 6:01 am Post subject: brake / fuel line fittings nut torque

LloydDR(at)wernerco.com
Guest

Posted: Thu Jun 14, 2007 7:10 am Post subject: brake / fuel line fittings nut torque

A set of crows foot wrenches will enable you to do this.

Dan

N289DT RV10E E 



--

Bill Schlatterer

Joined: 09 Jan 2006
Posts: 195

Posted: Fri Jun 15, 2007 8:50 pm Post subject: brake / fuel line fittings nut torque

Hope this sizes correctly.  AN torque values at the bottom of attachment and

also on page 9-19 of AC 43. 



ON page 7-8 and 7-9 of AC 43 (Acceptable Methods and Techniques) it gives

the conversion formulas.  Very easy to set up in a spreadsheet.  



Shows Crows foot wrench as a "Short Open End Adapter" on pat 7-8



Crows foot wrenches from Sears and adjust for about 1 & 1/2 inch offset.  



Actually should have the conversion formulas in the instructions with your

Torque Wrench.



Hope this helps



Bill S

7a Ark



--

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MauleDriver(at)nc.rr.com
Guest

Posted: Sat Jun 16, 2007 4:23 am Post subject: brake / fuel line fittings nut torque

That really helps.  Thanks for taking the time to scan.



Bill "still prepping for closing up the bottom wing skins" Watson



Bill Schlatterer wrote:

[quote] Hope this sizes correctly.  AN torque values at the bottom of attachment and

 also on page 9-19 of AC 43. 



 ON page 7-8 and 7-9 of AC 43 (Acceptable Methods and Techniques) it gives

 the conversion formulas.  Very easy to set up in a spreadsheet.  



 Shows Crows foot wrench as a "Short Open End Adapter" on pat 7-8



 Crows foot wrenches from Sears and adjust for about 1 & 1/2 inch offset.  



 Actually should have the conversion formulas in the instructions with your

 Torque Wrench.



 Hope this helps



 Bill S

 7a Ark



 --

Bill Schlatterer

Joined: 09 Jan 2006
Posts: 195

Posted: Sat Jun 16, 2007 7:51 pm Post subject: brake / fuel line fittings nut torque

I just noticed on the scan that I had highlighted the fine and coarse thread

torque tables and the highlight covered up the fine and coarse headings.

Fine thread torque values at the top, coarse in the middle, there is a big

difference.  The AN tubing torque values are on the bottom.



Glad it helped but the best thing to do is get a copy of the AC 43.  It's

cheap from Avery or Spruce.



Bill S 



--

AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Sat Jun 16, 2007 9:12 pm Post subject: brake / fuel line fittings nut torque

The needed pages are Pages 7-6 through 7-12 and 9-19 specifically for

torques on brake and fuel tubing.  I have PDFed the needed pages but for

the benefit of the string and tin-can group it is 4.9MB.  So, Send me a

request (offline) and I will forward the passage to those with

high-speed bandwidth and open attachment capability.



If you have a spring adjustable torque wrench don't forget to release

the pressure after using the tool... it helps calibration.



John Cox



--

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