OS46FX Broken Needle Valve Bracket Repair - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-27-2006, 05:50 PM   #1
Friesen 5
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OS46FX Broken Needle Valve Bracket Repair

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A hard landing resulted in a broken motor mount, which caused the engine to shift and break the bracket that holds the remote needle valve. I suspect the cool temperatures caused the motor mount to be less flexible and crack easier. I made a repair and am sharing the how to with you.

1. I used JB Weld to glue the two pieces back together.
2. I made a small angle bracket from aluminum (.025 6061T6) to fit the front flat side of the bracket. Tin from a can lid should work just as well.
3. When the joint (step 1) had set, I filed the excess JB Weld from the front side and edge. I then mixed more JB Weld to attach the aluminum bracket to the needle valve assembly. The 90 degree bend in the aluminum gives it much greater strength. It also has a lot more surface area for adhesion and should make it a much stronger joint.

Now if the JB Weld lives up to its claims, I should have a very strong bracket.

Mervin Friesen
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Old 10-27-2006, 06:49 PM   #2
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Nicely done.....

Nice and clean job done, these engines are great engines but this needle valve attachment design is just horriable, even with minor accidents these break off and i guess that is why AX has different mounting system.
After similar break on mine i ended up mounting it on firewall with some expory and it worked great on GP Spitfire ARF i used to have....
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Old 10-27-2006, 07:16 PM   #3
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Haven't had the "weld" work on that particular break yet. It lasts for maybe 1/2 dozen flights then it just parts company. Good luck with it.

I just let it dangle back there. Not a big deal.
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Old 10-27-2006, 08:05 PM   #4
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If it works you'll have to let us know. It would save thousands the embarassment of using a tie wrap to stap the neddle valve onto the motor mount like I do. And it sure beats the cost of a new backplate.

I keep having the same mechanical problem. I've got a loose nut on the transmitter!

G-manz35 AKA. George St.Amant MAAC#75084
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Old 10-27-2006, 08:30 PM   #5
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On The FX 25's we use for combat we always cut the needle valve off and attach it to the firewall. If it breaks in a crash it will sometimes ruin the engine back plate when it breaks in the wrong spot. Cutting it off clean and mounting it elsewhere was the answer.
Just FYI.
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Old 10-27-2006, 08:40 PM   #6
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Nice repair.

My thought would be to make a braket similar to the 46LA that bolts on two of the backplate screws and attach it under one of the barb fittings.

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Old 10-27-2006, 09:01 PM   #7
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My attempts at using JB Weld for this repair never worked out either. Hope you have better luck.
Dave Holmes

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Old 10-27-2006, 09:22 PM   #8
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Yea, I've tried that too. Lasts a few flights and breaks again.
Hey Buddy, thats a Kadet not an Extra!!!
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Old 11-19-2006, 11:09 PM   #9
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OS needle valve fix

Just use the needle valve housing from the 40LA or 60/65LA. The needle, ratchet and 'O' ring can be reused.
Mount it to the back of the engine with the OS bracket or just screw it to the firewall.
Available from Tower Hobbies in the US for US$7.50. Must be a source in Canada somewhere.
I use them all the time on my combat planes. Matter of fact first thing I do with a new OS25FX is cut the factory needle valve off the backplate - broke too many backplates before I figured this out!!
Here is the link:
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