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  #1  
Old 09-03-2018, 02:23 PM
Stockmanreef Stockmanreef is offline
 
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Default Section 40a-05-Castle Nuts?

I assume that the castle nuts for the nose gear leg don't have to be torqued and just have to be snug. Snug enough that the bolt rotates with the leg as it moves.

Thanks
ken
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  #2  
Old 09-03-2018, 04:54 PM
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RV-14E RV-14E is online now
 
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In this case, you want your nose gear leg to be able to pivot on the axis shared with those bolts. It's part of your "shocks", in conjunction with the stack of J-11968-14 (U-01407) Elastomer Pads and U-01416 Nose Gear Link Assembly.

From page 5-20:

FASTENERS AS PIVOT POINTS
In specific cases, bolts are intended to be used as axis of rotation. The most common example is the attachment of control system cables. Here, it is intended that the cable end fitting pivot on the bolt. In these instances, the nut must not be torqued to the standard torque value. Instead a castellated nut, safetied with a cotter pin, is used. Finger-tighten the nut, then install the cotter pin. The cable end fitting must pivot freely w hen the installation is complete.
Of course, do not neglect to insert and properly bend the cotter pins.

Note: You will probably end up disconnecting U-01416 to accommodate later installation of the exhaust.




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Last edited by RV-14E : 09-03-2018 at 04:57 PM.
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Old 09-03-2018, 06:06 PM
Stockmanreef Stockmanreef is offline
 
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I was wondering about this, even though it says finger tight, because I was wasn't sure what should rotate in this case the bolt or the bushing (greased) or both. In this instance, i was not sure, if the nut should be tightened down enough so that the bolt rotated with the nose gear and the bushing is what slid around when the nose gear moved. Or if both the bolt and the bushing should be able to slide around. When finger tight, the bolt does not move when the nose gear moves.

My thought was that if the nut was tightened down enough so that it moved with the nose gear (but not torqued), then it would not wear off the powder coating over time.

I guess, as usual, I am over thinking things.
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  #4  
Old 09-03-2018, 09:47 PM
Bavafa Bavafa is offline
 
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In the case that there is a bushing, I think the bushing is acting as a bearing and the bot should not rotate relative to the bushing. If the bolt is only finger tight then it could be turning inside the bushing. often times, if not always, the bushing is slightly longer than the case.

I will be interested in the answer as I believe I have torqued mine to the spec.
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  #5  
Old 09-03-2018, 09:59 PM
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Quote:
Originally Posted by Stockmanreef View Post
I was wondering about this, even though it says finger tight, because I was wasn't sure what should rotate in this case the bolt or the bushing (greased) or both. In this instance, i was not sure, if the nut should be tightened down enough so that the bolt rotated with the nose gear and the bushing is what slid around when the nose gear moved. Or if both the bolt and the bushing should be able to slide around. When finger tight, the bolt does not move when the nose gear moves.

My thought was that if the nut was tightened down enough so that it moved with the nose gear (but not torqued), then it would not wear off the powder coating over time.

I guess, as usual, I am over thinking things.
I asked Vans' Builder Support about the tightness of those bolts on 27-Sep-16 (specifically relative to page 40A-05, Step 3 and 40A-06, Step 6). The response was (italics mine):
For the castle nuts, refer to Section 5 page 18 (now page 5-20) under "Fasteners As Pivot Points". In this case, with the AN7 bolts, I generally tighten them a little more than finger tight, the align the slots with the hole on the bolt before inserting the cotter pin.
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Last edited by RV-14E : 09-03-2018 at 10:03 PM.
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  #6  
Old 09-04-2018, 08:49 AM
Bavafa Bavafa is offline
 
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Quote:
Originally Posted by RV-14E View Post
I asked Vans' Builder Support about the tightness of those bolts on 27-Sep-16 (specifically relative to page 40A-05, Step 3 and 40A-06, Step 6). The response was (italics mine):
For the castle nuts, refer to Section 5 page 18 (now page 5-20) under "Fasteners As Pivot Points". In this case, with the AN7 bolts, I generally tighten them a little more than finger tight, the align the slots with the hole on the bolt before inserting the cotter pin.
We might need a tie-breaker here as I had got my info from VANs support tech and they have confirmed that in area that there is a bushing, the bolt will get torqued as standard value. Other example of such place would be the aileron weldment or the stick pivot point in a RV7 which uses bushing and does not have bearing like the 14 does. Other places like the rudder cable attachment points that the bolt acts as a pivot point does not get torqued and only finger tight would be the correct way.
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Old 09-04-2018, 08:50 AM
rvbuilder2002 rvbuilder2002 is offline
 
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In cases where a bolt acts as the pivot/hinge point (such as the example of the clevis joint on a rudder cable end) the nut should be left loose enough to allow the joint to hinge with low friction.
In cases of a bushing, the bushing is intended to be constrained from rotating by clamping with the bolt but the bolt should still not be torqued to full value because the material typically used for the bushings can be compressed and distorted by doing so.
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  #8  
Old 09-04-2018, 09:07 AM
Bavafa Bavafa is offline
 
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Thanks Scott, I think that makes perfect sense.
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  #9  
Old 09-04-2018, 02:18 PM
Stockmanreef Stockmanreef is offline
 
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scott-

so what I said originally was correct? Snug down the bolt so that the bolt moves with the nose gear and the bushing is the part that rotates inside the engine mount.

Thanks
Ken
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  #10  
Old 09-04-2018, 02:37 PM
Stockmanreef Stockmanreef is offline
 
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E-

So is putting the exhaust in place prior to the nose gear a "gotcha"?

Maybe a separate thread should be started with this as a discussion. I know that I would be pissed if I put the engine on and found out I had to release the nose gear to get the exhaust in place.

I went out and tried putting the tailpipe in with the nose gear link assembly "in place". As E stated, it does not look like it will go in with the assembly in place.

thanks
ken
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