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  #1  
Old 12-31-2022, 04:18 PM
dsm8 dsm8 is offline
 
Join Date: Oct 2006
Location: Madison CT
Posts: 92
Default Engine mount and castellated nuts

Engine is hung:

Per KAI I have torqued the bolts to 160-190 in-lbs. At 160 in-lbs check to see if the nut castellation align with hole in bolt. At 160 it appears that the cotter key may not catch completely. There are at least 4 threads showing. My thought was to add an additional AN washer to ensure adequate torque.

Thoughts?
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  #2  
Old 12-31-2022, 06:13 PM
Bob Y Bob Y is offline
 
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Location: Piedmont, SC
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After sitting at 160 for a while to allow the tension to relax, I kept tightening until close to 190 and the hole and slot aligned.

I have quite a few threads showing.
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  #3  
Old 12-31-2022, 06:29 PM
Kyle Boatright Kyle Boatright is offline
 
Join Date: Aug 2005
Location: Atlanta, GA
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Quote:
Originally Posted by dsm8 View Post
Engine is hung:

Per KAI I have torqued the bolts to 160-190 in-lbs. At 160 in-lbs check to see if the nut castellation align with hole in bolt. At 160 it appears that the cotter key may not catch completely. There are at least 4 threads showing. My thought was to add an additional AN washer to ensure adequate torque.

Thoughts?


Add the right number of washers (no more than 3) to get the castellations on the nut roughly level with the hole in the bolt. Tighten the nut to 160 inch pounds. See if the cotter will fit. If so, push it through and bend it over. If not, continue tightening the nut (to no more than 190 inch pounds) until things align and you can push a cotter through. If you can't things aligned before 190 inch pounds, change the washer stackup - maybe eliminate a standard washer and replace it with an "L" washer, which is half the thickness.

In any case, your job is to add, subtract, and substitute washers until you can tighten the nut to 160-190 inch pounds and "finish" with the correct hole alignment.
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  #4  
Old 01-01-2023, 02:15 AM
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rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
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Van's has changed to lock nuts, which eliminates this problem. Check this thread.

https://vansairforce.net/community/s...d.php?t=189417
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  #5  
Old 01-01-2023, 08:52 PM
RFSchaller RFSchaller is offline
 
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I used the Mongo Method: tighten to 160 and then continue until I get a slot aligned. Almost 11 years and over 1200 hours with no issues.
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  #6  
Old 01-02-2023, 01:11 AM
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mike newall mike newall is offline
 
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Mongo just pawn in game of life....
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