Career Infinity by Shinsung - Part 2
by B.B. Pelletier
This is part 2 of the Career Infinity report. Normally, I'd be testing velocity, but something came up. Today I'm going to take you on a short excursion inside a gun, to show you a little about how they work and also how easy they are to repair.
You see, when I tried to fill the test rifle for velocity testing last week, the inlet valve wouldn't accept air. Then, at around 3,000 psi, the inlet valve suddenly popped open and accepted a fill of about 1,000 psi inside a few seconds. It seemed clear that the inlet valve was sticking.
When I tried to bleed the fill clamp, the air never stopped--a sure sign that the inlet valve was now refusing to close. So, the rifle lost its entire fill. I then sat looking at the gun for many minutes, trying to decide what to do next. That's not unlike what many of you would do when something similar happens. Normally, I would have boxed up the rifle and shipped it back to Pyramyd Air, but this time I noticed that the design of the Infinity inlet valve is quite simple and straightforward, as though it was built to be repaired. I partially disassembled it and saw that it was as simple as I had imagined, so I thought this time I would fix it myself and let you see what's involved.
A call to Boris at Pyramyd Air got me the parts I needed. They turned out to be a simple o-ring and the inlet valve seal. We'll do velocity next time (which won't be long now that the rifle is fixed).
The inlet valve body is aluminum and very straightforward. It screws into the air reservoir tube and two o-rings seal it. Taking it off required one 10" channel-Lock pliers and a leather belt to keep the jaws from marking the valve body. Everything came apart easily, and I confirmed that the inlet valve seal was the cuplrit.
I'm going to show you the rebuild in pictures.
Are we done?
I aired up the rifle to 2000 psi and it held fine, so this job is done. Start to finish was probably an hour, but the reassembly seen here took 30 minutes with the photography. Writing the blog took a lot longer.
Why did I show this to you? Because in all honesty, things like this happen sometimes. I knew this one was simple, and I wanted to show you what that means. The keys here are cleanliness and lubricating with silicone grease.