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  #1  
Old 08-17-2018, 07:01 PM
Stockmanreef Stockmanreef is offline
 
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Default Engine Mount Question: 40a-02

Just about to put in the engine mount and I had a question about the washer count on 40a-02. In Figure 1 it clearly says 10X NAS1149F0663P. What does this mean? there are 6 bolts, so if there is supposed to be 2 washers per bolt, then it would be 12X.

Then for the nut side, there are supposed to be 2X washers for the top bolts and 1X washer on the bottom four bolts. Correct?

What am I missing?
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  #2  
Old 08-17-2018, 08:14 PM
mturnerb mturnerb is online now
 
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I count 14 total given that the two upper bolts get two washers each on the nut side. Not clear from the picture whether the lower center bolts get washers on the nut side, but I assume they do. The "10x" is confusing to say the least.
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  #3  
Old 08-17-2018, 09:32 PM
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RV-14E RV-14E is offline
 
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All bolts get NAS1149F0663P on the head side. That's 6 washers.

The lower four bolts get NAS1149F0663P on the nut side. That's 4 washers.

So those 10 washers are the called out "10X NAS1149F0663P".

Finally, the upper two bolts each get NAS1149F0632P on the nut side. That's 2 washers.

12 washers total, distributed as outlined.
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Last edited by RV-14E : 08-18-2018 at 08:49 PM. Reason: Adjusted count per post #6
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  #4  
Old 08-18-2018, 03:54 AM
mturnerb mturnerb is online now
 
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Quote:
Originally Posted by RV-14E View Post
All bolts get NAS1149F0663P on the head side. That's 6 washers.

The lower four bolts get NAS1149F0663P on the nut side. That's 4 washers.

So those 10 washers are the called out "10X NAS1149F0663P".

Finally, the upper two bolts get 2x each NAS1149F0632P on the nut side. That's 4 washers.

14 washers total, distributed as outlined.
Subtle! Thanks for pointing out the difference. Sometimes it takes another set of eyes to see the obvious.
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  #5  
Old 08-18-2018, 06:37 AM
Tom023 Tom023 is offline
 
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I just checked mine and have one thin washer under upper nuts and two thick under lower outside corners. I did this to get the proper shank and protruding threads. Just use the plans as a starting point and adjust accordingly.
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Last edited by Tom023 : 08-18-2018 at 10:35 AM.
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  #6  
Old 08-18-2018, 07:57 PM
Stockmanreef Stockmanreef is offline
 
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that is clear as mud, but now I have to disagree with the count. It should only be 12.

The call out is for 10X 663 and 2X 632 (upper bolts only), which equals 12

663 on the both sides of the 4 lower bolts = 8
663 on head side of top bolts = 2
632 on the nut side of top bolts = 2

12 washers total. Each bolt only gets 2 washers.

This is the way the washers are called out on other parts of the plans.
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  #7  
Old 08-18-2018, 08:49 PM
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RV-14E RV-14E is offline
 
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Quote:
Originally Posted by Stockmanreef View Post
that is clear as mud, but now I have to disagree with the count. It should only be 12.

The call out is for 10X 663 and 2X 632 (upper bolts only), which equals 12

663 on the both sides of the 4 lower bolts = 8
663 on head side of top bolts = 2
632 on the nut side of top bolts = 2

12 washers total. Each bolt only gets 2 washers.

This is the way the washers are called out on other parts of the plans.
You are correct. I erroneously stated 2 each NAS1149F0632P for the upper bolts on the nut side. The plans call out only one NAS1149F0632P each for the top two bolts on the nut side.
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My RV-14A's POH and checklists (annual and flight) are here.
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