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Engine Mount Question: 40a-02

S

Stockmanreef

Well Known Member
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?
 
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.
 
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.
 
Last edited:
RV-14E said:
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.
Click to expand...

Subtle! Thanks for pointing out the difference. Sometimes it takes another set of eyes to see the obvious.
 
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.
 
Stockmanreef said:
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.
Click to expand...

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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