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  #1  
Old 05-21-2022, 05:44 AM
mulde35d's Avatar
mulde35d mulde35d is offline
 
Join Date: Dec 2017
Location: Clarksville, TN
Posts: 287
Default Galling

Vent session ahead.

I was taking my time and being careful on the RV-10 fuel tanks since I know that a small misstep can cause serious pain and labor later. Left tank came out great. Right tank is near completion. Just before installing the rear baffle I installed the plug for the currently unused fuel return flange that I installed. Applied locktite 567 liberally to both the plug and flange. Backed the plug out a half turn any time I felt resistance. Finally during the last turn the torque was almost at 120 in/lbs and I pushed through a tiny bit of resistance when I felt the galling. Tried to unscrew it a little to relube the threads and it didn't want to budge.

Used a lot of force to unscrew it as a galled NPT fitting likely won't seal and definitely wont work if I end up installing a return line later and sure enough, strips the threads on both the plug and flange.

Luckily the Baffle is not yet installed, but the VA-141 flange is on backorder. Looks like I will have my right fuel tank sitting open for a while longer. Who knows how long the flange is on backorder for. Frustrating and nobody to blame but myself. At least I should be happy it is only a $40 mistake and fixable since the rear baffle was not yet installed.
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  #2  
Old 05-21-2022, 06:08 AM
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Walt Walt is offline
 
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Aluminum into Aluminum is bad mojo for pipe threads.
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  #3  
Old 05-21-2022, 07:22 AM
Freemasm Freemasm is online now
 
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Location: Orlando
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Got a picture of the flange or dimensions? I have some old, not RV10 tanks. If I can find the needed part on them, I can drill it out and send it to you.

Last edited by Freemasm : 05-21-2022 at 07:27 AM.
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  #4  
Old 05-21-2022, 07:59 AM
lr172 lr172 is offline
 
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Location: Schaumburg, IL
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Let me know if the B/O is months. I can make you a flange. Have a lathe and mill and always looking for a project to make a couple dollars. Probably couldn't do it for $40 bucks as the cost of metal, especially in small lots, has gotten insane.

Larry
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  #5  
Old 05-21-2022, 08:24 AM
krhea krhea is offline
 
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Location: Peck, Kansas
Posts: 188
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Retap apply grease liberally, tap 1/4 turn clean, degrease several times,then go find a brass plug, face plug, pipe thread dope with Teflon, don’t put dope on first two threads, screw in two threads then apply pipe dope.

Keith Rhea
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  #6  
Old 05-21-2022, 12:04 PM
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mulde35d mulde35d is offline
 
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Default Clean up

Quote:
Originally Posted by krhea View Post
Retap apply grease liberally, tap 1/4 turn clean, degrease several times,then go find a brass plug, face plug, pipe thread dope with Teflon, donít put dope on first two threads, screw in two threads then apply pipe dope.

Keith Rhea
Found a 3/8" NPT tap in my drawer and tried to clean up the threads. Here is what I have. Debating on re-installing and using a brass plug as you recommended or waiting for a new one. The chip out of the thread is my only real concern. Thoughts?
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  #7  
Old 05-21-2022, 12:36 PM
bbsdad bbsdad is offline
 
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Location: tx
Posts: 118
Default Galling

I have an extra drain bung fitting for an rv -6 tank itís new. You can have if it will work for you. Not sure if itís drilled or not. Iíll check today when I go to the airport.

RD
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  #8  
Old 05-22-2022, 06:35 AM
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Bill.Peyton Bill.Peyton is offline
 
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Jon,
I may have one in my hangar also. If RD doesn't find one send me a pm. I will look today to make sure. You can replace it when yours comes in.
Bill
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  #9  
Old 05-22-2022, 04:20 PM
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mulde35d mulde35d is offline
 
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Appreciate the offers for help. I have plenty of other stuff to do and the tanks sitting open wonít hurt anything. I was considering re-using the old one that I tapped, but a friend reminded me that if the chip did leak and the baffle were installed then it would be a real mess. Might as well wait for a new one.

If someone has a VA141 they donít plan to use I will gladly buy it, otherwise waiting for one from the mothership will be fine.
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  #10  
Old 05-22-2022, 06:37 PM
krhea krhea is offline
 
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Location: Peck, Kansas
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A thread is just an incline, lots of incline before and after chunk to seal. 50 years hvac. Service and that includes pipe threads, steel, brass, aluminum into pot metal gas valves, natural gas, lp gas, refrigerants too.
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