FX M3 has a small leak somewhere

[Gambler]

I took my m3 out to shoot a few shots Just to see if everything is ok and it seems not too, 3weeks since last time i shot it and now med 2nd reg has lost 20bar.
And now comes the question, it went down from 150 to 130 in 3 weeks, probably not a big leak, but my 1st reg still at 180, thats the thing i dont understand, if it leaks after 2nd reg shoudnt it Just keep filling up until 1st reg is down to 150 also?
So where do I start to look?

 

[bdzjlz]

Went through that recently with mine, and it was the o-ring under the Allen plug just above the gauge at 10:00. Secured the correct o-ring from the rifle vendor. In this case, it was an easy fix.

 

[Gambler]

Went through that recently with mine, and it was the o-ring under the Allen plug just above the gauge at 10:00. Secured the correct o-ring from the rifle vendor. In this case, it was an easy fix.

I try that and see, ty

 

[dens228]

Mine was easy, it was a speck of something on the o-ring behind the first reg. Took the reg out, replacedthe o-ring, good as new.

 

[Gambler]

Looks like I got rid of the leak, dont know where it was cuz I took out all gauges and blindplugs and put in new orings
But another question, I see others m3 .25 on YT shooting around 150bar and they are not so loud as mine, they all get a "pfft" sound and a get a big old PB crack, almost when shooting too high speed and crack the sound barrier, but my chrono says 990.

 

[dens228]

Try turning your valve in a little at a time. Maybe still have a bunch of air releasing when your projectile is exiting the barrel.

 

[Gambler]

If I turn my valve in i start to loose fps.

 

[dens228]

Yes, you will.
I have tuned this way. Set the second reg, use the hammer spring until you peak. Peak about 25 fps above where you want it. Turn the hammer back until I'm about 10-15 above my goal, turn the valve back until I'm at my goal starting at 4 lines, about 10 mm.
Usually when I do this it's shooting very well before I use the valve, the valve tightens the group up a tiny bit and quiets the bark.

 

[Airgunmann]

If it was on the second reg it has to be either in the reg or behind it I've found usually the rear gauge it the culprit for small leaks I would try snugging it up some most of the time takes care of it

 

[dens228]

If it was on the second reg it has to be either in the reg or behind it I've found usually the rear gauge it the culprit for small leaks I would try snugging it up some most of the time takes care of it

He already fixed it. But you're right, he believes it was one of the gauges.

 

[Gambler]

Well it was fine for a while and I suspect it was the 1st reg gauge. I took it out today after 2weeks and it was completely empty today, only bottle tho, plenum holds the air. So I took out the 1st reg gauge again and now I see i hole in the threads that goes up towards the valve Rod. Is that normal or is my Block broken? I tried to put oring under the gauge to press against the Block but cant even build up preassure with compressor cuz its leaking so bad.

 

[PasadenaMike]

Sorry it’s leaking. The first time my Maverick had a leak and I couldn’t figure it out I sent it in to UA. While it was there I just decided to trade it in. Glad I did because 2 regs make things more annoying and time consuming with tuning and leak detection.

 

[Trucker3573]

I wouldn’t think that little in 3 weeks was even a leak. Probably just some temp change or cooling from a fill or when you put it away.

 

[Trucker3573]

Sorry it’s leaking. The first time my Maverick had a leak and I couldn’t figure it out I sent it in to UA. While it was there I just decided to trade it in. Glad I did because 2 regs make things more annoying and time consuming with tuning and leak detection.

Just hope it wasn’t under warranty. Really the rapage from trade in is generally way worse than expense to fix then sell if you don’t like the gun. Under warranty would have only been cost of shipping.