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  #1  
Old 05-17-2020, 10:53 AM
avrojockey's Avatar
avrojockey avrojockey is offline
 
Join Date: Aug 2019
Location: Appleton, WI
Posts: 347
Default Preventing Rod End Thread Corrosion?

Heres what I pulled out of my rudder yesterday while doing another repair...



Seems to be galvanic corrosion from the reinforcement plate, rudder horn and rudder spar. I pulled the other heim bearings and they had the same thread corrosion but not as bad as the lower bearing.

Im replacing the bearings but would like some thoughts on preventing future occurrences. I'm leaning towards and annual spritz of CorrosionX to weep down the threads.
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Appleton, WI
RV-9A N904DC
2019-2021 Dues Paid
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  #2  
Old 05-17-2020, 11:22 AM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest
Posts: 1,358
Default Antiseize

I would think a good anti seize would better. One and done?

Also, why is the plate touching this? Is the clearance hole not big enough, or is it off center?

If it is just junk building up in the hole, I again go back to my antiseize to fill up that spot. JMHO YMMV
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John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

Dues paid 2021, worth every penny

RV9A- Status:
Tail 98% done
Wings 98% done
Fuselage Kit 98% done
Finishing Kit 35% canopy done for now
Electrical 65% in work
Firewall Forward 5% in work
Fiberglass 0%, thought i was building in metal?
www.pilotjohnsrv9.blogspot.com

Last edited by PilotjohnS : 05-17-2020 at 11:25 AM.
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  #3  
Old 05-17-2020, 11:42 AM
gfb gfb is offline
 
Join Date: Jul 2014
Location: Madison, WI
Posts: 749
Default

If you are grounded waiting on this part you are welcome to come grab some from my not-yet-flying RV10. Just let me know which part # and I'll confirm I have them handy.
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  #4  
Old 05-17-2020, 11:45 AM
jibby212 jibby212 is offline
 
Join Date: Oct 2014
Location: Sarasota Fl
Posts: 178
Default

Check out Tef Gel, works great especially in salt enviorments.
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  #5  
Old 05-17-2020, 01:02 PM
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avrojockey avrojockey is offline
 
Join Date: Aug 2019
Location: Appleton, WI
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Default

Quote:
Originally Posted by gfb View Post
If you are grounded waiting on this part you are welcome to come grab some from my not-yet-flying RV10. Just let me know which part # and I'll confirm I have them handy.
Mighty fine of you, but ACS-Midwest is back open now after their "COVID cleanse" and I can get them by Tues. I have enough to occupy my time til then.
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RV-9A N904DC
2019-2021 Dues Paid
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  #6  
Old 05-17-2020, 01:13 PM
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Ironflight Ironflight is offline
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Location: Dayton, NV
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Default

Are you sure that's corrosion Tim? It looks a lot like what I generally see on lower rudder rod end bearings as an accumulation of belly oil and dirt. On almost every RV tail dragger, you're going to get dirt accumulating on whatever oil/lubrication is there.

Just asking because I have never seen corrosion on those things - even when I lived in a salt air environment - but I have seen lots of grime....

Paul
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RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
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  #7  
Old 05-17-2020, 01:18 PM
TShort TShort is online now
 
Join Date: Jan 2005
Location: Indianapolis, IN (KUMP)
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Default

I'd like to see what it looks like cleaned up - it is hard to see if the threads are corroded / damaged, or just caked with gunk like others have mentioned.
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KUMP - Indianapolis, IN / KAEJ - Buena Vista, CO
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  #8  
Old 05-17-2020, 02:12 PM
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avrojockey avrojockey is offline
 
Join Date: Aug 2019
Location: Appleton, WI
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Quote:
Originally Posted by Ironflight View Post
Are you sure that's corrosion Tim? It looks a lot like what I generally see on lower rudder rod end bearings as an accumulation of belly oil and dirt. On almost every RV tail dragger, you're going to get dirt accumulating on whatever oil/lubrication is there.

Just asking because I have never seen corrosion on those things - even when I lived in a salt air environment - but I have seen lots of grime....

Paul
I thought that was the case at first but the picture is AFTER I took it to a wire brush then to a wire wheel on the bench grinder. Its definitely corrosion. Anyway at only $16 a piece its worth replacing all of them on a flight control.

Interesting though is the lower rudder fairing didn't have a drain hole in it per plans and water had collected in it. I wonder if the lower bearing being in close proximity to it had anything to do with the corrosion being worse.

BTW...fully enjoyed your webinar a couple weeks ago!
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2019-2021 Dues Paid
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  #9  
Old 05-17-2020, 01:12 PM
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avrojockey avrojockey is offline
 
Join Date: Aug 2019
Location: Appleton, WI
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Quote:
Originally Posted by PilotjohnS View Post
Also, why is the plate touching this? Is the clearance hole not big enough, or is it off center?

If it is just junk building up in the hole, I again go back to my antiseize to fill up that spot. JMHO YMMV
I checked the clearance and it was good. I also checked the construction manual and hole is suppose to be drilled to 3/8"...it looks like it was (I'm not the builder).

I think anti-seize sounds like the ticket, and tef gel looks promising...I'll just stay away from jam nut portion of thread for proper torque.
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Appleton, WI
RV-9A N904DC
2019-2021 Dues Paid

Last edited by avrojockey : 05-17-2020 at 01:36 PM.
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