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torque value of fuel servo/engine studs

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Mike Whisky

Joined: 05 Jun 2006
Posts: 336
Location: Switzerland

Posted: Tue Jan 29, 2013 1:40 pm Post subject: torque value of fuel servo/engine studs

Hello,



can someone please tell me what the torque value of the fuel servo/engine studs are. Or where I can find this information.

Thanks

Michael

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_________________
RV-10 builder (flying)
#511

flying-nut(at)cfl.rr.com
Guest

Posted: Tue Jan 29, 2013 2:06 pm Post subject: torque value of fuel servo/engine studs

AC 43-13 is the 'bible' for aviation       and everybody should have a copy.  You'll have far more knowledge       at your fingertips ...... or mouse ..... than you'll possibly have       questions for!!!

       You can find it here:  http://www.faa.gov/regulations_policies/advisory_circulars/index.cfm/go/document.information/documentID/99861

       or http://tinyurl.com/3hr4js4.

       

       To answer your question .... at least generally, look at table 7-1       0n page 7-9 of AC43-13 for torque values for various size bolts.

       Linn

       

       On 1/29/2013 4:40 PM, Mike Whisky wrote:

     

     [quote]        	  Quote: 	
		  --> RV10-List message posted by: "Mike Whisky" <rv-10(at)wellenzohn.net> (rv-10(at)wellenzohn.net)



Hello,



can someone please tell me what the torque value of fuel servo/engine studs are. Or where I can find this.

Thanks

Michael



--------

RV-10 builder (interior &amp; finishing)

#511





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=393243#393243





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charliewaffles

Joined: 15 Mar 2011
Posts: 18

Posted: Tue Jan 29, 2013 2:36 pm Post subject: Re: torque value of fuel servo/engine studs

Actually, when it comes to the engine side of things, Lycoming specifies the torque for everything on the engine. You should refer to Service Table of Limits - SSP_1776 for anything relating to the Lycoming studs, bolts, nuts, etc... If its not called out for specifically, they have a default torque section at the end of the document. These are typically HIGHER than anything in AC43.13 or other sources as most threads are coarse threads.

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Tue Jan 29, 2013 4:36 pm Post subject: torque value of fuel servo/engine studs

True, but with the servo, higher torque values are not better. You only 

need enough to secure it and the gasket from air leaks. Very different 

than holding case parting line together, for example. Also, you will be 

using a lock tab, so they are not going to loosen. I'd recommend 

sticking with the AC43-13-1B values for this application.

  Just as Lycoming's spark plug torque value is 10 ft lbs higher than 

Continental's, for the very same threads in the same helicoil and same 

aluminum alloy. The Lyc representatives I've talked to could never give 

a reason for the high torque value for spark plugs, that just about 

requires a breaker bar to remove them. I've been using 25 ft lbs on my 

certified Lycoming for over 10 yrs and 700 hours with no issues.

Kelly

A&P/IA



On 1/29/2013 3:36 PM, charliewaffles wrote:

 	  Quote: 	
		   



 Actually, when it comes to the engine side of things, Lycoming specifies the torque for everything on the engine. You should refer to Service Table of Limits - SSP_1776 for anything relating to the Lycoming studs, bolts, nuts, etc... If its not called out for specifically, they have a default torque section at the end of the document. These are typically HIGHER than anything in AC43.13 or other sources as most threads are coarse threads.





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=393246#393246






	


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Kelly McMullen
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