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  #1  
Old 01-05-2012, 08:47 AM
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Dgamble Dgamble is offline
 
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Default Engine mount bolt/cotter pin

When torqued to 160 in-lbs, the top engine bolts are far enough into the castellated nuts that it seems as if the cotter pin doesn't have a full grip:



Considering that the cotter pin will still keep the nut on the bolt, should I leave it as-is, or try to find a washer to shorten up the bolt a little bit?
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  #2  
Old 01-05-2012, 09:18 AM
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edsong edsong is offline
 
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Default Washers

Yes, thick or thin washers are used to place the castle nut in the right position to accept the cotter pin.
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  #3  
Old 01-05-2012, 09:19 AM
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A washer certainly would help here in adding more meat for the cotter pin to be surrounded by. For my own peace of mind if I had this issue, I would add one and redo with a new cotter pin.
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  #4  
Old 01-05-2012, 11:29 AM
Bruce Russell Bruce Russell is offline
 
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I had this exact problem. After a gentle suggestion by my DAR, a washer of the appropriate size centered the hole in the nut.
-Bruce
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  #5  
Old 01-05-2012, 01:42 PM
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It's still easily accessible - no reason not to.
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RV-6 N466PG Purchased already flying - SOLD!

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  #6  
Old 01-05-2012, 02:08 PM
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rv6rick rv6rick is offline
 
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What Anthony said.

Also, for those folks who are reading that might consider showing their plane at Oshkosh....the Judges will absolutely mark down if that castle nut was displayed same as in the pic.

Quote:
Originally Posted by Dgamble View Post


Considering that the cotter pin will still keep the nut on the bolt, should I leave it as-is, or try to find a washer to shorten up the bolt a little bit?
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  #7  
Old 01-06-2012, 09:26 AM
rampilot rampilot is offline
 
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Quote:
Originally Posted by Dgamble View Post
should I leave it as-is, or try to find a washer to shorten up the bolt a little bit?
Dave- That looks like the top engine mount and my iteration of plans call for a AN960-616 washer to back the nut on the top two mounts (no washer is called out on the bottom two mounts). I hung my engine last night... Here's mine without the cotter pin installed torqued to 160 in/lbs and even with the washer it looks like it could still use another.

[IMG][/IMG]

The same is true for the other top mount. The bottom mounts appear to be fine. Is it acceptable to stack two washers there behind the nut? Or do you guys recommend putting the additional waster on the bolt head side?

Thanks!
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Last edited by rampilot : 01-06-2012 at 09:36 AM. Reason: typo
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  #8  
Old 01-06-2012, 10:46 AM
Bruce Russell Bruce Russell is offline
 
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Quote:
Originally Posted by rampilot View Post
Or do you guys recommend putting the additional waster on the bolt head side?
I would put the washer on the nut side. A washer on the bolt side would change the effective grip length of the bolt.
-Bruce
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Last edited by Bruce Russell : 01-06-2012 at 11:11 AM. Reason: spelling
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  #9  
Old 01-06-2012, 11:50 AM
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Dgamble Dgamble is offline
 
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I ordered some -616 and 616L washers last night. The thin L washers should allow a little fine-tuning if required.

Quote:
Originally Posted by rampilot View Post
Dave- That looks like the top engine mount and my iteration of plans call for a AN960-616 washer to back the nut on the top two mounts (no washer is called out on the bottom two mounts). I hung my engine last night... Here's mine without the cotter pin installed torqued to 160 in/lbs and even with the washer it looks like it could still use another.
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Dave Gamble
Grove City, OH

RV-6 N466PG Purchased already flying - SOLD!

The Book: The PapaGolf Chronicles

Built RV-12
http://www.schmetterlingaviation.com

The Book: Schmetterling Aviation

The above web blogs and any links provided thereto are not instructional or advisory in nature. They merely seek to share my experiences in building and flying Van's RV airplanes.
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  #10  
Old 01-06-2012, 12:20 PM
rampilot rampilot is offline
 
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Quote:
Originally Posted by Dgamble View Post
I ordered some -616 and 616L washers
At $.04 each... Wonder what the shipping will cost...
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