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  #71  
Old 10-13-2021, 03:16 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
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Quote:
Originally Posted by goatflieg View Post
After giving the refit a 12 day cure time, I refilled my brake system and checked again. The left side is solid. The right side is worse than I thought.
See Video:
https://youtu.be/_vTm7Bqe2Jo
Pretty disgusted. Don't really want to hear any more opinions at the moment, but I am sharing this before going back to work the problem.
Did you run a tap into the hole for a turn or so to dress the threads? Which sealant did you use?
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  #72  
Old 10-13-2021, 07:45 PM
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goatflieg goatflieg is offline
 
Join Date: Jul 2013
Location: Clarkston, MI
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Quote:
Originally Posted by Taltruda View Post
Did you run a tap into the hole for a turn or so to dress the threads? Which sealant did you use?
See previous posts, and my follow-up below.
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Martin J Filiatrault
Clarkston, MI
RV-8 #83507 - registered; final assembly continues; still putting out my own brush fires.
Builder websites:
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http://www.mykitlog.com/goatflieg/
YouTube Channel:
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  #73  
Old 10-13-2021, 08:09 PM
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goatflieg goatflieg is offline
 
Join Date: Jul 2013
Location: Clarkston, MI
Posts: 811
Default This BETTER have fixed it!

After retreating to my home to compose the video and lick my wounds, I returned to the hangar with a vengeance. With the system already drained I detached the tubing from the upper and lower fittings and removed the offending right side elbow fitting. Evidence showed about four full threads of engagement after my last attempt.

The gear leg fluid line was cleared with compressed air. The threaded hole was retapped about 2 more turns; the tap removed and the hole thoroughly cleaned numerous times with alcohol and compressed air, clearing it from the bottom up so any chaff would blow out the freshly rethreaded end. This process was repeated until I was satisfied that the threads were clean, healthy and deep; verified with inspection.

The elbow fitting was thoroughly cleaned and recoated with Loctite 567 thread sealant, making absolutely sure that the sealant coated the threads completely. The elbow was carefully reinserted into the threads and tightened... and I mean TIGHTENED. I was just barely able to clock it to the correct position. The area was cleaned and the tube nut reattached. The engagement is significantly improved - from four threads to eight threads.


The bottom flared fitting was reattached and both flared fittings were torqued and sealed. I will allow the assembly to cure for at least 24 hours; probably about 36 hours. Only then will another test be performed and captured with video. Based on the amount of care (and force) applied to this last repair, I anticipate success. Let me rephrase that: if the right fitting still leaks after this reassembly, I will lose all hope for this gear leg in its current state and it will have to come off. Please hope along with me that I won't have to face that. I've had enough setbacks on this project, thank you.
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Martin J Filiatrault
Clarkston, MI
RV-8 #83507 - registered; final assembly continues; still putting out my own brush fires.
Builder websites:
http://goatflieg.blogspot.com/
http://www.mykitlog.com/goatflieg/
YouTube Channel:
https://www.youtube.com/user/goatflieg
Dues paid for 2021... extra payment included for psychological therapeutic services rendered.

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  #74  
Old 10-14-2021, 07:02 AM
TS Flightlines TS Flightlines is offline
 
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Location: Ridgeland, SC
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Hey Martin---this WAS a true AN822-4D correct----and not (what I call ) an imposter fitting? Even though NPT threads are supposed to be standardized all over the world, we have seen minor variances in non-AN versions.
Just asking.

Tom
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  #75  
Old 10-14-2021, 07:06 AM
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riseric riseric is offline
 
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Tom just beat me to it...
What if the fitting is defective???
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  #76  
Old 10-14-2021, 08:09 AM
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goatflieg goatflieg is offline
 
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Quote:
Originally Posted by riseric View Post
Tom just beat me to it...
What if the fitting is defective???
I doubt that's the issue. I used two new (matching) fittings on the second try and they're the right spec. They're used in multiple locations and the upper gear leg fittings are the only locations that have had a problem. Tom, I'm hoping that minor variations are not the issue based on the purchase source. In every way I'm able to determine they are the correct and identical fittings.
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Martin J Filiatrault
Clarkston, MI
RV-8 #83507 - registered; final assembly continues; still putting out my own brush fires.
Builder websites:
http://goatflieg.blogspot.com/
http://www.mykitlog.com/goatflieg/
YouTube Channel:
https://www.youtube.com/user/goatflieg
Dues paid for 2021... extra payment included for psychological therapeutic services rendered.

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Last edited by goatflieg : 10-14-2021 at 08:14 AM.
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  #77  
Old 10-19-2021, 01:32 AM
benjam benjam is offline
 
Join Date: Mar 2019
Location: Brisbane, Australia
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Couple of questions:

Goatflieg, what was the outcome? Success?

And would Loc-tite 243 be satisfactory as a sealant?

Or Permatex 57535?

I am about to seal the fittings for the sky designs version of the gear legs.
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  #78  
Old 10-19-2021, 01:34 AM
benjam benjam is offline
 
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Location: Brisbane, Australia
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And why is thread tape not an option?
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  #79  
Old 10-19-2021, 11:50 AM
SuperCubDriver SuperCubDriver is offline
 
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Location: Germany
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Once my A&P recommended or approved thread tape on brake lines. I objected but he said there is no fluid movement in our brake systems so is ok. He was very experienced and right - at least as far as I can judge.
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  #80  
Old 10-19-2021, 03:21 PM
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goatflieg goatflieg is offline
 
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Location: Clarkston, MI
Posts: 811
Default Success at last?

My new gallon of Aeroshell Fluid 31 arrived today; drained old/flushed fluid into storage and refilled pressure pot with new fluid. Refilled and bled brake system; no spills, no leaks. I let it sit for awhile and for a moment I actually didn't want to test it because another leak would have really hurt... but I got back on the horse and checked both pedals: seems ok. Checked underneath: still no leaks; fittings and legs dry. Checked cockpit lines: tiny bubbles in each line. Bled both sides again and checked: solid pedals; no leaks; no bubbles, no fresh drips on the ground anywhere. I dare not convince myself that it's fixed until I check again tomorrow, but for now it's looking pretty good.
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Martin J Filiatrault
Clarkston, MI
RV-8 #83507 - registered; final assembly continues; still putting out my own brush fires.
Builder websites:
http://goatflieg.blogspot.com/
http://www.mykitlog.com/goatflieg/
YouTube Channel:
https://www.youtube.com/user/goatflieg
Dues paid for 2021... extra payment included for psychological therapeutic services rendered.

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