I need help!... Valve does not seals after changing o'ring of filling port.

[Emu]

I had an slow leak by the filling port of my Evanix Windy City .25 Cal.

I made shots without pellet until all air was gone.

Changed the O'ring, reasambled the filling port and screw it to the rifle.

I cocked the rifle and send a big hit of air with the squba tank, but the valve makes all air go by the barrel.

I will appreciate your advice. In all previous ocassions with the cocking and hit from the squba the valve sealed.

I tried also to load a pellet, but the pellet was expelled.

Any advice will be welcome!!!

 

[DennisB]

Hi

did you loose the small spring in the fill port

It holds the seal into the body of the fill port

Dennis B

 

[Emu]

Never saw that spring....

 

[Lewis]

Air coming out of the barrel indicates an open firing valve. Try cocking the gun while filling to see if you can get the valve to close under pressure.

 

[Emu]

Air coming out of the barrel indicates an open firing valve. Try cocking the gun while filling to see if you can get the valve to close under pressure.

I have tried that many times. Firing valve continue open....

 

[Emu]

What can make the firing valve not to close?..... And how can I fix it?

 

[doni]

What can make the firing valve not to close?..... And how cay I fix it?

The seal of the valve stem is broken. I mean, when you fire the gun without air, in some PCP the hammer spring is too strong and breaks the Delrin of the valve. Also, with the pressure, the seal bends but works because it's in the same position. Once you empty the cylinder the seal moves the position and provokes the leak. The solution is replacing the valve stem.

 

[Enkey]

Hi

It is not a good idea to shoot until the bottle is empty. Check that your valve is in good condition and works correctly, for some reason your valve is open

Regards 

Enkey 

 

[Motorhead]

Take action out of stock & remove barrel band if present. .... where air tube and its end / mounting block slips into receiver you will see IIRC 2 grub screws on the bottom of receiver. Loosen these and PULL OUT the air tube and valve assembly. At that point you can see if poppet is STUCK. It could be if over time any mushrooming of poppet stem has happened. Emptying air by shooting allows the poppet to be driven in further than it does when operating at shooting pressures. Thus the mushroomed end is wedged into the pilot hole where it STICKS !!



Good luck ...

Scott S

 

[Emu]

You should be proud of me !!!



I was able to disassamble the firing valve, clean it, polish it with a tissue, reassable it and now the air is dully kept.

A total success without spending a dime!!!!

 

[Emu]

Take action out of stock & remove barrel band if present. .... where air tube and its end / mounting block slips into receiver you will see IIRC 2 grub screws on the bottom of receiver. Loosen these and PULL OUT the air tube and valve assembly. At that point you can see if poppet is STUCK. It could be if over time any mushrooming of poppet stem has happened. Emptying air by shooting allows the poppet to be driven in further than it does when operating at shooting pressures. Thus the mushroomed end is wedged into the pilot hole where it STICKS !!



Good luck ...

Scott S

That was the solution !!!!

Thanks a lot !!!!!!

 

[Scotty1]

Nice! That was pretty fast, glad you didn’t suffer too long before getting great help…love this forum!

 

[Emu]

Nice! That was pretty fast, glad you didn’t suffer too long before getting great help…love this forum!

Indeed !!!!

This forum is a tangible asset for our hobbie !!

 

[Motorhead]

Excellent. This type issue is not only an evanix one .... It can happen to most given similar circumstances.



Scott S