FX Crown leaking through barrel and pin probe

RabbitBlaster · Sep 7, 2020

Hey folks, a few of you may have seen a post I made a while back where I had air leaking from the barrel and also when the pellet probe was pulled back. Well, I put a new delrin seal in and for a while it seemed to go away...then it came back. It came back when the delrin seal and brass collar slid back. So, I put some loctite under the seal and collar and put it back together and for a few days it seemed to work. However, it appears that it had a slow leak. So today I tried to fill the bottle and the slow leak is now a fast leak. I took it all apart and have now tried 3 valve seals including the original one, and two valve pins, including the original one and with the original valve seat. All of the o-rings seem ok, all of the surfaces that are visible seem ok. Is there anything else it could be?

Enkey · Sep 7, 2020

Hi

Have you checked the oring that goes between the valve seat and the block

Regards

Enkey

RabbitBlaster · Sep 7, 2020

Yep, it is all good. It is looking to me like perhaps my valve spring is weak and that I may need more sealing area (a larger delrin seal). The strange thing is that it worked fine for several weeks and only now is having problems. That is why I suspect the spring being part of the issue. Has anyone had something like this happen before?

Souhaib · Sep 8, 2020

Did you shoot it at low reg pressure ?

RabbitBlaster · Sep 8, 2020

I do not think I shot it a low pressure. I may have gone a little below the reg, but not much. What would happen if I had shot at low pressure and what should I look for if I had?

Cheers,

Pat

Enkey · Sep 9, 2020

Hi

I have never worked on the block of a crown, do you know if it has a lateral register to see the valve stem and check that the valve closes completely and does not get stuck leaving something open

Regards

Enkey

RabbitBlaster · Sep 9, 2020

First time for me as well! I would be glad to hear if someone else has an answer!

Chuck-in-Ohio · Sep 9, 2020

Have you pulled it back apart yet?

It sounds like your valve seat may be cracked or broken.

RabbitBlaster · Sep 10, 2020

Yep I did pull it apart again. The delrin had slid back on the pin- again. I used loctite on it and it still slid. I am not saying that this is the only problem because there may be another leak. The seat is fine- I have used 3 different seats to test them all. The problem appears to be with the pin. Certainly the delrin and cuff slides back at 160 plus bar. Also, there may be something causing the pin to not slide as easily as it should, hindering the ability to seal- maybe. That may be that the spring hot lost its strength and/or the hammer may have deformed the housing where it strikes the pin. I am investigating all of these options and it may be one or many.

I can fill it and go out and take a few shots but the tank loses the air within an hour. The other night I shot a few times and then I heard the delrin slide back...it sounded like a couple of farts. With any luck I can find a way to make that stick and then I can investigate the other issues.

Enkey · Sep 10, 2020

Hi

You repair your weapon as you see fit, but gluing the parts that work under high pressure with super glue the only thing you are going to do is go crazy looking for the breakdown. Your valve may close properly with the valve seat and air is leaking between the delrin and the stem.

Regards

Enkey

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FX Crown leaking through barrel and pin probe

RabbitBlaster

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Enkey

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Souhaib

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Enkey

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Chuck-in-Ohio

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