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  #1  
Old 03-27-2021, 04:47 PM
Draker's Avatar
Draker Draker is offline
 
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Location: Livermore, CA
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Default Passing a flare nut through a grommet

Vans baffle assembly instructions call for a AN941-6-16 grommet to secure the prop oil line, where it comes up through the right air ramp and feeds in behind the starter ring gear. This grommetís inner diameter is 3/8Ē which snugly fits the oil line, but does not allow the existing flare attach nut to pass through. Any tips that donít involve making a new prop oil line?

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Ryan Drake
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  #2  
Old 03-27-2021, 04:51 PM
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wirejock wirejock is offline
 
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Default Grommet

Warm it up, apply some lube and work it. I've worked quite a few grommets and o-rings over stuff I never thought they would clear.
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Larry Larson
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  #3  
Old 03-27-2021, 05:17 PM
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Ironflight Ironflight is offline
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Default

If Larry’s method doesn’t work, in this case you can just slit the grommet with a razor blade, put it on the tube, and pop it into the hole. The slit won’t pass any significant amount of air - but if it bothers you, just goop the area up with RTV when you seal everything else.
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Last edited by Ironflight : 03-27-2021 at 07:20 PM.
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  #4  
Old 03-27-2021, 05:21 PM
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Mike S Mike S is offline
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Quote:
Originally Posted by Ironflight View Post
If Larry’s method doesn’t work, in this case you can just slit the grommet with a razor blade, put it on the tube, and pop it into the hole. The slit won’t pass any significant amount of air - but if it bothers you, just goop the area up with RTV when you seal everything else.
Yep, what Paul said. Split grommet is a common way to deal with stuff like this.
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Last edited by Ironflight : 03-27-2021 at 07:20 PM.
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  #5  
Old 03-27-2021, 05:38 PM
Martyrv6a Martyrv6a is offline
 
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I split several during my build but cut them at a diagonal to the hole versus 90*.
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  #6  
Old 03-27-2021, 05:45 PM
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Yeah, just split it. No big deal.
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  #7  
Old 03-27-2021, 06:25 PM
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Thanks. After spending way too long trying to jam this in Iím just going to split it when the time comes.
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  #8  
Old 03-27-2021, 07:48 PM
BillL BillL is offline
 
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Default Try cyanoacrylate

Quote:
Originally Posted by Draker View Post
Thanks. After spending way too long trying to jam this in Iím just going to split it when the time comes.
Slit on the table with a sharp razor in a straight line, then after installation in the desired location, you can glue it with super glue. Clean with isopropyl alcohol to be sure it is clean.

In one of my engineering assignments a chemical engineer for non-metallics sat next to me. She was making prototype o-rings for the lab. Now, she cut the extrusion at a 45 deg angle, but they did need to stretch. I have extra o-rings of larger diameter (correct cross section) and successfully made a few.

Give it a try with a spare to be sure of the specific compatibility. Personally have found the splits are so tightly closed by the exterior they are invisible anyway.
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  #9  
Old 03-27-2021, 08:07 PM
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jcarne jcarne is offline
 
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No slitting required. Get your socket set out, push it on to one that is slightly larger than the ID then line that socket up with one that is slightly larger. Keep passing it back and forth between slightly bigger sockets. You can get one of these bushings quite stretched out with this method. Once you have it to the ID you need just push it on to the nut. It sometimes takes a couple tries but it works beautifully!
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  #10  
Old 03-27-2021, 11:03 PM
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Nice! I used Jeremeís socket method to get it into a -6D threaded bulkhead union. Then just screwed the nut onto the fitting and the grommet transferred over the nut easily. Thanks!
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