FX Bobcat MK2 air tube leaking through end cap

[ljgnemo]

I received a Bobcat MK2 .30cal today from Precision Airgun and Supplies. Upon filling out of the box, I noticed a hissing sound, and the pressure will drop quickly when filling stops. I removed the air tube and stock, and located the leak to the end cap area (not the fill port and gauge end), which connects to the gun.

Just to be clear, this is not a leak in the gun or the regulator which seems to be a more common occurrence. This is the air tube/tank itself leaking. And this is not the fill port leaking, but rather through the seems between the end cap and the tube body.

Any ideas? Would Precision be able to replace or repair?

 

[FX Airguns]

Hello Ljgnemo,

The problem is that the manometer in the front isnt sealing against the plastic washer.

What is needed is to remove the twist cap (simply pull it out) and then tighten the manometer a little.



to tighten it one needs a narrow 11mm wrench.

I am certain Precision will be able to assist you with it.

Best regards Johan

 

[ljgnemo]

Johan, thank you for the quick response. I tightened the manometer using a 11mm wrench, but the leak has not been stopped. I made sure I tighten it as much as I can, and I even loosened it entirely and re-tightened. It does not seem to help.

Also just to make sure you understand my problem, it is not the front (manometer and fill port) end that is leaking, it's the back end (the part that has FX logo and manufacturing info, and has a thread going into the main body of the gun) which leaks.

Here I have attached both front

https://imgur.com/FcUzmxx

and back end

https://imgur.com/2YlcUnx

of my air tube for reference.

Thank you.

 

[FX Airguns]

I'm sorry ljgnemo, I read the post to quickly and missread.

I take it that it is leaking here



then you have to change the O-ring on the tube end on that side

if you have a round nose plier you can unscrew it and put in a new 28x3 NBR 70 O-ring

Or send it to AoA and let them fix it.



//johan

 

[ljgnemo]

Thanks Johan. I unscrewed the end cap. However the o-ring in there seems to be completely fine, so I cleaned the threads a little bit, there seems to be a little dirt/metallic deposit around it. After re-assembly, the leak seems to have went away (water tested). So I guess it's just the installation was not appropriate the first time.

In any case, fingers crossed this does not happen again. And I ordered some more spare o-rings just in case.

One last question, what is the intended pressure for the regulator on the 30 cal? the air tube right now is filled at 200 bar (out of gas due to all the testing), but the regulator gauge shows around 160-165 bar, which seems a bit low to me.

 

[FX Airguns]

Happy to see that you managed to fix the problem!


and your regulator seems just fine, the intended pressure is 160+-2Bar on the 30. cal and 140-143Bar on 22 and 25.



//Johan

 

[Bob]

Thanks FX for helping your customers with there problems so quickly , it nice to know if I need help it want take weeks to get a answer !
Good job -- Bob 

 

[toddley10]

I have a leak coming from a small hole in the housing that the monometer threads into (the black part, and I believe I canned part of the brass monometer through thru hole), and it only seems to leak right after filling it (higher pressure). Any suggestions?

 

[ljgnemo]

Not sure what you meant by this: 

"I believe I canned part of the brass monometer through thru hole"

However, the small hole in the housing the manometer threads into is used for bleeding the air before removing the gauge itself.

If you start to unscrew the gauge, you should start to hear hissing. Let it bleed all the way to empty, then you should be able to remove the gauge all the way.

Examine the threads, both the male and female. Clean them, check for contaminants, and make sure there is nothing blocking the male thread from going all the way down to the female thread well.

There appears to be no o-ring or sealant involved in this fitting assembly. So screw the gauge back in, tighten using 11mm wrench, and be careful not to strip the threads.

If this does not work, apply teflon thread sealant tape to the male part, 6 layers should be sufficient.