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engine mount ears and attaching the Bendix Throttle body

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indigoonlatigo(at)msn.com
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Posted: Fri Nov 26, 2010 7:40 pm Post subject: engine mount ears and attaching the Bendix Throttle body

Two questions, one was never completely answerred in the archives.

 

Would like to confirm the torque values on the 3/8-16 studs which attach the mount ears to the engine case. The confusion for me is, yes it is a 3/8 bolt, but it is a stud coming out of the case. Table I, of the SERVICE TABLE OF LIMITS, for a 3/8 bolt gives a torque value of 30 Ft/lbs, but when you look at the parts manual, these four bolts coming out of the case are called 3/8-16 studs and Table V gives a Min. Driving Torque value.  What is the correct answer????? I need the torque on the 5/16-18 studs for the attachment of the throttle body also. 

  

 I am surprised that the engine mount ear studs do not specify a value...I would think them to be very important.

 

I cannot find any literature explaing the attachment of the throttle body. I have two gaskets which look similar and I have a bag of self looking nuts, plain washers and some star lock washers. There are (16) of these self locking silver colored nuts, what are they for????The engine came with nuts and stackes of washers holding the Delrin plastic plate which kept the engine preservative in. Are these nuts not to be used?

 

Thanks

 

John 409 



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Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Fri Nov 26, 2010 10:01 pm Post subject: Re: engine mount ears and attaching the Bendix Throttle body

You need to get hold of the Lycoming manual. (search on line). Many of the torques recommended by Lycoming are higher than standard for AN. I don't know why. Maybe because they also use lock washers? Or the high vibration levels?



You got 2 gaskets so if you use Van's part to hold the cable ends, it goes between the throttle body and the engine, with one gasket on either side.



Bob

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Bob Turner
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