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  #1  
Old 10-28-2017, 07:46 PM
pilot28906 pilot28906 is offline
 
Join Date: Apr 2006
Location: Murphy, NC
Posts: 579
Default Engine Mount Bolt Torqued?

I installed the engine mount today on the 7 and it went surprisingly well. The question I have is what torque do the castellated nuts get? Also what have others used as shims for the bottom center bolts?

Thank you.
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  #2  
Old 10-28-2017, 09:11 PM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
Posts: 3,868
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IIRC, one of my shims was a disc of 1/8" stock. Can't remember if the other spot has a thin sheet, or nothing.

Charlie
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  #3  
Old 10-28-2017, 09:27 PM
tgmillso tgmillso is offline
 
Join Date: Nov 2012
Location: Launceston, Tasmania, Australia
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The nuts are torqued to 160-190in lb. you will need to vary your washer stack up to get the right bolt torque and have the cotter pins align. I just used some appropriately thick alclad sheet to make my spacer for the bottom two mount locations. They were later sealed around with fire barrier 2000+ so it is water tight and poses no intermetalic corrosion risk.
Tom.
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  #4  
Old 10-28-2017, 09:47 PM
Robin8er Robin8er is offline
 
Join Date: Sep 2015
Location: Socal
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I just used two washers for mine. Hopefully the engine doesn't fall off.
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  #5  
Old 10-28-2017, 10:06 PM
gasman gasman is offline
 
Join Date: Mar 2007
Location: Sonoma County
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Put a couple hundred hours on the plane and then go back and check the torque on those motor mount bolts.
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  #6  
Old 10-30-2017, 10:58 AM
pilot28906 pilot28906 is offline
 
Join Date: Apr 2006
Location: Murphy, NC
Posts: 579
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Thanks for the information all!
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  #7  
Old 10-30-2017, 12:36 PM
Jrskygod Jrskygod is offline
 
Join Date: Dec 2011
Location: Edinburg, TX
Posts: 654
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Can someone explain why castellated nuts are used in this application? There is no rotational movement. Why aren't metal locking nuts used here?

PS: checked mine today and 3 of 4 were not tight enough.
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