I got this Impact MKII in .25 caliber a couple months ago and have probably put about 2000 pellets and about 200 slugs through it total. A couple of weeks ago I noticed that after the gun sat overnight the pressure dropped about 5BAR from full, every night it dropped about 5BAR more until it got down to lower pressures and then it dropped less each night until it tapered down to 3BAR, 2BAR a night. Then it got low enough that it seemed to quit leaking when it got down to around 40-50BAR. I tried everything short of dunking the action in a bucket of water to find the leak. I started with detecta-leak on all the known spots, checked all the O-rings, took it partially apart to check more O-rings, etc... I've watched all of Ernest's videos multiple times, talked to Edosan, Ernest and Brian multiple times and can't find the leak. It's probably nothing difficult or too problematic but this is my first Impact and I am not as familiar with the internals as I should be. It's really not that big of a deal except that I'm OCD and I hate thinking about my gun having a small leak.
The other day I started testing a bunch of Nick Nielsen's new slugs with great results but it was very windy. I wanted to continue testing on a calm day so I went out this morning to continue testing at 8am. I shot a couple of good groups with the 33.5gr slugs at 50 and 100yds, after 2 1/2 magazines, when the gun got to 155BAR, I decided to re-fill. I filled it, set it aside to load a magazine and when I went to chamber a round I heard a psssss sound coming from the breech. Oh, crap, not a slow leak anymore!
I got my tools, pulled the barrel and determined the sound was coming from the transfer port area. What I want to know from you Impact experts is where you would start looking for this kind of leak or what it sounds like it might be? What's the simplest way to get at it? From what I described, does it sound like a problem with the C3 bumper, a different O-ring problem, the valve assembly somewhere, or something else? Does the fact that it was a very slow leak at first and where the leak is coming from even help give you any ideas?
I have taken my Impact partially apart but never fully apart. I'm not afraid of disassembly, well maybe I am a little worried with a full disassembly because I don't have the specialized tools necessary and I don't want to damage anything because of it. The first time is always a little scary, even though it always turns out to be no big deal and easier than anticipated. I think I'll make some specialized tools as I go. I really need to be more familiar with the internals of this gun anyway! If I was familiar like I should be, this would probably be a 15 minute fix!
Anyway, any thoughts, ideas, advice or help of any kind would be appreciated. I'm on the remainder of my vacation for the next 6 days and would really like to have this fixed asap so I can continue slug testing while I have some time off and no honey-do-list!
Thank you in advance for your help!
Stoti
The other day I started testing a bunch of Nick Nielsen's new slugs with great results but it was very windy. I wanted to continue testing on a calm day so I went out this morning to continue testing at 8am. I shot a couple of good groups with the 33.5gr slugs at 50 and 100yds, after 2 1/2 magazines, when the gun got to 155BAR, I decided to re-fill. I filled it, set it aside to load a magazine and when I went to chamber a round I heard a psssss sound coming from the breech. Oh, crap, not a slow leak anymore!
I got my tools, pulled the barrel and determined the sound was coming from the transfer port area. What I want to know from you Impact experts is where you would start looking for this kind of leak or what it sounds like it might be? What's the simplest way to get at it? From what I described, does it sound like a problem with the C3 bumper, a different O-ring problem, the valve assembly somewhere, or something else? Does the fact that it was a very slow leak at first and where the leak is coming from even help give you any ideas?
I have taken my Impact partially apart but never fully apart. I'm not afraid of disassembly, well maybe I am a little worried with a full disassembly because I don't have the specialized tools necessary and I don't want to damage anything because of it. The first time is always a little scary, even though it always turns out to be no big deal and easier than anticipated. I think I'll make some specialized tools as I go. I really need to be more familiar with the internals of this gun anyway! If I was familiar like I should be, this would probably be a 15 minute fix!
Anyway, any thoughts, ideas, advice or help of any kind would be appreciated. I'm on the remainder of my vacation for the next 6 days and would really like to have this fixed asap so I can continue slug testing while I have some time off and no honey-do-list!
Thank you in advance for your help!
Stoti
