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  #1  
Old 10-12-2015, 07:16 AM
TFeeney TFeeney is offline
 
Join Date: Mar 2014
Location: Floyds Knobs, IN
Posts: 174
Default Priming Torque Tubes & Push Rods

I've been putting off the priming of my torque tubes because I didn't have a great method in my mind for getting good coverage. On the RV10, the tubes are over 7.5 ft long each, so access is not easy.

The most frequent suggestion I've seen was to spray "a bunch" of primer inside the tube and swirl it around. I didn't feel comfortable that the rattle can had enough juice to go the length of the tube, so my best solution at the time was to buy Variprime and use it for the swirl. My thinking was that more liquid = better (compared to a rattle can). Problem was that the quart size of Variprime was going to cost over $120 with the converter. That stuff is liquid gold!

As I was at the auto paint store telling the guy what I was trying to do, he suggested an extension for the rattle can with a 360 deg nozzle on the end. Apparently its used in the autobody world for rust prevention around doors and fenders pretty frequently. The extension reaches 4ft so that my aircraft tubes could be primed from each end - and the best part was the cost was only $35. Sold.

Not much to the technique, but be aware of how small the surface area is that's being painted. If you are slow with the retraction of the nozzle, the primer will run all over.

Hope this idea helps someone else and prevents as much head scratching time as I wasted.

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  #2  
Old 10-12-2015, 08:44 AM
ERushing's Avatar
ERushing ERushing is offline
 
Join Date: Apr 2014
Location: Underwood, WA
Posts: 413
Default

Awwww!!! One week too late. Just did mine last week with the "spray a whole lot of 7220 in the tube and swirl it around" method!

That's a great idea, tho!!
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  #3  
Old 10-12-2015, 10:37 AM
wilddog wilddog is offline
 
Join Date: Feb 2008
Location: va.
Posts: 523
Default

FAA recommends boiled linseed oil. It is very easy to apply, drill a 1/8" hole in the pushrods and inject some into the tube. Slosh it around, drain and fill the hole with a tube rivet.
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  #4  
Old 10-12-2015, 03:01 PM
N427EF N427EF is offline
 
Join Date: Oct 2005
Posts: 1,516
Default Really simple

Just follow Vans directions and swirl a bit if primer around in
Those tubes, done. For better paint distribution you can follow up
With a few burst of compressed air.
I have to admit the extension is a great idea but $35???

Linseed oil was the old standard, nothing wrong with it
But now you have to go out and buy linseed oil and what are you
Going to do with the rest of it?
Caution: Linnseed oil soaked rags can self ignite when left
In a pile and that is no OWT
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  #5  
Old 10-12-2015, 03:18 PM
wilddog wilddog is offline
 
Join Date: Feb 2008
Location: va.
Posts: 523
Default Linseed oil

Somewhere on the FAA web site, they recommended boiled linseed oil for both aluminum and steel pushrods.
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  #6  
Old 10-12-2015, 03:45 PM
Gisnar Gisnar is offline
 
Join Date: Nov 2012
Location: Northern Nevada
Posts: 137
Default

Interesting spray head. Do you have a name or manufacturer?
Could be very useful for applying corosionX or similar.
Thanks
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  #7  
Old 10-12-2015, 04:00 PM
8 ball 8 ball is offline
 
Join Date: Dec 2014
Location: hilltop lakes' Texas
Posts: 135
Default

This my 2nd post. Probably doing everything wrong. I am an rv8 driver, in Hilltop Lakes Tx. 0te4. I would like to purchase a QT technologies headset.They are not taking orders until they catch up some. Maybe someone has a used one that is excess. Thanks. 936 855 9013.
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  #8  
Old 10-12-2015, 04:04 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
Default MODERATOR

Moderator, I think the above post would be better placed in "wanted/for sale".

Carroll, welcome to VAF!
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  #9  
Old 10-13-2015, 08:55 AM
TFeeney TFeeney is offline
 
Join Date: Mar 2014
Location: Floyds Knobs, IN
Posts: 174
Default Nozzle kit part number

Quote:
Originally Posted by Gisnar View Post
Interesting spray head. Do you have a name or manufacturer?
Transtar Part # 4471 - Corrosion Protection Kit. Available at O'Reilly Auto, or Amazon. I got mine from an Auto Paint specialty store.

Quote:
Originally Posted by N427EF View Post
Just follow Vans directions and swirl a bit of primer around in those tubes, done.
For better paint distribution you can follow up with a few burst of compressed air.
I have to admit the extension is a great idea but $35???
With a 7.5ft tube and not being able to see, I wanted the extra assurance that I had primer covering everything in there. I still don't know for sure without doing a borescope inspection - but THAT would be crazy overkill . Just another solution.
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  #10  
Old 10-13-2015, 08:54 PM
Charles in SC Charles in SC is offline
 
Join Date: Aug 2006
Posts: 703
Default

The linseed oil is hard to beat. If you warm it up you can feel the tube and tell where it is inside. This is the way the steel tube fuse homebuilders treat their's.
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