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torqueing GSC prop bolts

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clemwehner

Joined: 02 Feb 2009
Posts: 32

Posted: Mon Aug 12, 2013 9:13 pm Post subject: torqueing GSC prop bolts

How do I properly torque the prop bolts on a GSC 3-bladed ground adjustable prop on a 912 engine. The bolts go through the hub and the prop flange from the front. This means the nuts are on the backside of the prop flange and you can't get a torque wrench in there on the nuts. 



The only option seems to be by turning the bolt head, but then there is a lot of resistance from the bolt in the hole which will cause the torque readings to be wrong. 



How should I torque these bolts? What is everyone else doing?



thanks for the help,



Clem

Oklahoma

KF-IV, 912

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lcfitt(at)sbcglobal.net
Guest

Posted: Tue Aug 13, 2013 5:32 am Post subject: torqueing GSC prop bolts

Clem,

You might try a crow foot wrench the torque wrench.  It would require a 

little math as the crow foot adds about an inch to the arm of the wrench so 

the torque value would be reduced a bit.  I do know, however, of some who 

torque the bolt head.  In that case you would have to determine the friction 

and add that to the torque value.

Lowell



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

From: "clemwehner" <clemwehner(at)sbcglobal.net>

Sent: Monday, August 12, 2013 10:13 PM

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

Subject: torqueing GSC prop bolts



 	  Quote: 	
		   



 How do I properly torque the prop bolts on a GSC 3-bladed ground 

 adjustable prop on a 912 engine. The bolts go through the hub and the prop 

 flange from the front. This means the nuts are on the backside of the prop 

 flange and you can't get a torque wrench in there on the nuts.



 The only option seems to be by turning the bolt head, but then there is a 

 lot of resistance from the bolt in the hole which will cause the torque 

 readings to be wrong.



 How should I torque these bolts? What is everyone else doing?



 thanks for the help,



 Clem

 Oklahoma

 KF-IV, 912





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mikeperkins

Joined: 22 May 2007
Posts: 123

Posted: Tue Aug 13, 2013 8:04 am Post subject: Re: torqueing GSC prop bolts

I have been torquing the bolt heads on my GSC prop for 20 years, no problems. The bolts should not be tight in the holes - at least mine aren't. Way back when, I ran an experiment when the prop was on a bench to determine if there was much difference between torquing the nuts vs torquing the bolt heads; there wasn't. 



AC43.13-1B says it's ok to do this. In paragraph 7-40 it says: "Be sure the bolt and nut threads are clean and dry, unless otherwise specified by the manufacturer. Run the nut down to near contact with the washer or bearing surface and check the friction drag torque required to turn the nut. Whenever possible, apply the torque to the nut and not the bolt. This will reduce rotation of the bolt in the hole and reduce wear. . . . . When torque is applied to bolt heads or capscrews, apply the recommended torque plus friction drag torque."

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_________________
Mike Perkins
Havana, Illinois
Model I, 532, B gearbox, GSC prop

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