FX Cutlas leaking out valve

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cmcleod

cmcleod

Member
Jun 6, 2023
14
39
Portland
I just finished rebuilding my old FX Cutlas complete down to valve pins, valve seat etc. It was tight as a drum and held air perfect on the bench. When I pulled the airtube and mounted it in the stock I cocked it to check the auto return on the side lever and of course accidentally dry fired it.

Once I replaced the airtube it started slow leaking out the barrel. I assume it just popped the valve seat loose, but is there a chance I need to replace the valve pin and seat?

This was one of those defeating moments where I was basically done and now I need to pull the valve apart.
 
It sounds like you drive fired your gun without the air reservoir connected and no air pressure on the back of the valve which definitely invites damage. I damaged mine in my FX independence which shares the same action as the Royal 400 series and maybe similar to yours. Dry firing these with little or no air pressure is known to cause damage. Your valve pin may just need to be polished or possibly straightened. Try rolling it to see if it is bent. If you can't straighten it, at least you have a second one.

Regards,
Feinwerk
 
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Feinwerk said:
It sounds like you drive fired your gun without the air reservoir connected and no air pressure on the back of the valve which definitely invites damage. I damaged mine in my FX independence which shares the same action as the Royal 400 series and maybe similar to yours. Dry firing these with little or no air pressure is known to cause damage. Your valve pin may just need to be polished or possibly straightened. Try rolling it to see if it is bent. If you can't straighten it, at least you have a second one.

Regards,
Feinwerk
Click to expand...
Thank you for confirming. It was definitely without air pressure in the valve when it got struck by the hammer. The first valve pin looked slightly off center in the valve body before I pulled it. The replacement sealed up fine. I was lucky to have ordered a spare pin/seat when I ordered my rebuild kit.

The gun was holding pressure this morning so it’s time to chrony.
 
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