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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.
John Johnson
Murphy, NC
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Old 10-28-2017, 09:11 PM
rv7charlie rv7charlie is offline
Join Date: May 2006
Location: Pocahontas MS
Posts: 3,868

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.

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Old 10-28-2017, 09:27 PM
tgmillso tgmillso is offline
Join Date: Nov 2012
Location: Launceston, Tasmania, Australia
Posts: 843

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.
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Old 10-28-2017, 09:47 PM
Robin8er Robin8er is offline
Join Date: Sep 2015
Location: Socal
Posts: 538

I just used two washers for mine. Hopefully the engine doesn't fall off.
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Old 10-28-2017, 10:06 PM
gasman gasman is offline
Join Date: Mar 2007
Location: Sonoma County
Posts: 4,388

Put a couple hundred hours on the plane and then go back and check the torque on those motor mount bolts.
VAF #897 Warren Moretti
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Old 10-30-2017, 10:58 AM
pilot28906 pilot28906 is offline
Join Date: Apr 2006
Location: Murphy, NC
Posts: 579

Thanks for the information all!
John Johnson
Murphy, NC
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Old 10-30-2017, 12:36 PM
Jrskygod Jrskygod is offline
Join Date: Dec 2011
Location: Edinburg, TX
Posts: 654

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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