Hi I am new to pcp airguns and have a fx maverick , while attempting to adjust the regulators I removed the bottle and and bled the system of air , while attempting to repressurize the gun air leaks out of the barrel , the valve is obviously not closing, I inspected the valve and valve seat there appears to be no damage , I also accidentally fired the gun with no air which know you are not supposed to do , I cocked the gun to take pressure of that valve it still leaks , any help is appreciated
Air leaking from the barrel
- Thread starter andysodyssey
- Start date
Maybe your valve return spring is not working or out of position. I am wondering what you are using to fill the gun? I have read that on pcp guns sometime they need a blast of air from a tank to seal the valve when filling from empty a pump or compressor may be too slow. If your tank from the gun is still charged that should do it. I can’t think what could be causing a down the barrel leak beside the valve pin or seat.
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Yeah sounds like either the return spring is no good, or it needs a blast of air. I had the same issue with my Hatsan Sortie last week. I did replace the the valve seat with a spare, which didn't do much initially. But a day later and after dumping a few mags and refilling, the problem suddenly went away. Im still planning to replace the return spring, because it did look slightly bent. But for now... it works... somehow.
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With air pressure in the rifle try dry firing it and see if that helps. You also should have the rifle cocked with the safety on when charging the rifle just to make sure your hammer spring isn't holding the poppet valve open slightly.
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Did you actually pull out the valve seat ? I just know it isn’t uncommon for them to go bad. Might not be able to really tell without removing it.
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I doubt it is a valve return spring problem, I run some of my power/big bore Airguns without a valve return spring.
I used to fill my Bulldog with a hand pump, without the valve return spring by cocking it with the muzzle pointed down with no problems,
I fill with a tank now and just cock the riffles and give them a blast of air, this works well on my Bighorn, Kratos and Texan LSS. Once the valve seals, you have at least 3000 psi pushing your valve shut.
Regards,
Roachcreek
I used to fill my Bulldog with a hand pump, without the valve return spring by cocking it with the muzzle pointed down with no problems,
I fill with a tank now and just cock the riffles and give them a blast of air, this works well on my Bighorn, Kratos and Texan LSS. Once the valve seals, you have at least 3000 psi pushing your valve shut.
Regards,
Roachcreek
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If none of the above works, the top ring on the Maverick #2 reg adjuster is gone, 5 min fix. Popping out the valve seat is fairly easy with a brass pick, just takes time, putting it back in is nice with a 1/2" or so rod, just take your time. I doubt it'll be necessary. JMHO.
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QD bottle adapter braided line and a Peazy....SET LOW at first...jiggle the cocking hammer or cock....That worked for me...............AND HOGKILLERS tip on that o-ring....That good advice for quick investigation.....ask me how i know....LOL
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I've had to put a slug in my barrel after changing the power plenum on my impact in a last ditch effort to seal mine couldn't get it to seal up just using a fast burst of air but make sure it is pointed in a safe direction and stand off to the side of the gun
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A: there is no law that say's you can't fire the gun without air in it, how else are you going to adjust your trigger in the house? I do it all of the time, no issues. As I stated, the top o-ring on #2 reg is bad. FX is good but from personal experience they mess up on occasion, I had a bad o-ring on #1 reg right from the git-go. Look up the o-ring sizes on the FX site and go to McMaster-Carr or any o-ring supplier and by a bunch each, ESPECIALLY the breech o-rings they go fast and are fun to change, hint, pull the barrel. I've got 2 Mavericks, getting a 3rd in month or so. Watch Ernst Low's Master Class Videos and you too can tear these puppies apart and get them back together, it's really not that hard, worst case scenario you box up the parts and sent it to FX. I haven't had to do that .....YET.
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No, there is no law but FX will void your warranty if you do. It's something about the poppet valve over traveling. That's why they say to turn your hammer spring tension down to the min. when degasing the rifle to work on it. Earnest Row's videos is where I learned that from and he knows a heck of a lot more about PCPs than most of us.
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Meh, they'll reassemble it for $150, or is it $120, I forget, but either way not a bad deal. There are some on this forum that'll do it for less. Ok, I just checked our mates country, he's on his own but I'm sure that with a little help he'll be fine if push comes to shove.
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Valve spring seems like the most likely culprit , I tried filling the gun with the action cocked it just a continuous stream of air rushing out the barrel , its definitely not closing , firing the gun with not air may have over compressed the spring as there would be
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I pulled the valve seat out it looks good ,I have only fired a couple of hundred rounds through the gun ,
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Hi , I have watched the video by earnest already already and stripped
Thanks for the reply, I have watched the video by Ernst and already have the gun apart including the valve seat , the gun is new I have only fired couple of hundred rounds, shouldn't the valve still seal with a bad reg , it will not hold any pressure at all its just a constant rush out of the barrel not a slow leak
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It's still the reg seal, go in and replace each and every one of them with the PROPER Durometer hardness. Don't ask how i know. I had the bottom adjuster seal leaking, the air came out of the little breather, had the top one let go and..air came out of the barrel, I'll bet a buck it's a shredded top seal. I will pay up btw. At least it's a learning experience. The reg seals are generally a beech to do and not destroy them in the process. I got some reverse tweezers on Amazon to GENTLY stretch them to get them on the adjuster. www.amazon.com/gp/product/B073SJD7L5/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1, roll on the first one then do the second one, be sure to use silicon oil www.amazon.com/gp/product/B09JFDYBYC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1, the little sucker in the end, I use a small plastic rod to keep it from going down too far. I use brass picks. Someone could make a nice piece of change making a few tools and selling them as a kit for the seal replacements on these things, not everyone has lathe (me) to make their own tooling.
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Thanks for that advice it's worth a look , I am a total bumbly when it comes to pcp guns , thanks
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It's a learning curve, steeper for some than for others, mine was straight vertical. There is a ton of help here. There are, I believe two 90 du's in the regulators if memory serves, they are important!! Also they don't stretch much so be careful or...buy a bunch, I bought enough to rebuild my guns 10 times over. Over kill or cheap insurance, your option. After I got everything sorted out in my project gun, the only issues I've had are on the breech seal, to be expected. I did have an issue with my #2 reg, on my project gun, the .22 compact, couldn't get the #2 reg to get any pressure, to speak of, short version, got a brass piston from FX under warrenty, and started playing with the Belleville washer thickness, a .48 average stack give you 75-125 bar pressure, and dead consistent, oh and I did polish the snot out of the contact surfaces on the reg. I didn't do the washers and they are rock solid so not messing with success.
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As an FYI, I did re-read the manual and it does specifically say, not to adjust the trigger without air, so I was WRONG in that, but it doesn't say it'll void the warranty. I do remember seeing somewhere NOT to fire the gun with the cocking handle back, I went through the manual 3x and didn't see that, I know for a fact THAT will score the daylights out of the hammer and break the housing internally, pictures available upon request. Not because I did that but because a previous owner of my project gun did. FX is pretty forgiving on people messing with their guns and asking for parts.
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