S&W 586/686 Repair - Co2 Capsule Puncture Mechanism
Feb 12, 2021 23:08:24 GMT
HeadHunter, honestjohn, and 1 more like this
Post by twodoctors on Feb 12, 2021 23:08:24 GMT
Just a thread on the repair of my SW 686.
I bought my preloved SW686 and it's amazing. Not sure how old it is but it was working well for me for the past 3 months or so. I did notice however that the CO2 capsule is not puncturing cleanly like my other air pistols that uses screw-type locking system. What I was finding over the last 2 months was sometimes the CO2 won't puncture. I need to screw the plate up, close the lever, release it, screw the plate up a bit more, and close the lever again. Then it will shoot, and shot fine as well.
It finally developed a "fault", or at least the fault became more apparently. The pistol is still shooting, but I can hear the power output is nowhere near as it was before. My 15m zero moving to 25m requires 50 clicks! I was literally lobbing pellets down the garden. Something must be up. Time to investigate further.
One thing I did notice is that the piercing pin appears quite short.
That's the best picture I can get with the phone. But it was still shooting so I ignored it. This is a part that will be replaced in due course.
The other thing I noticed when I bough the pistol was that the CO2 locking lever doesn't go back up fully. Easier to explain with photos.
Again, it was shooting fine. So I ignored that. These parts will be replaced also.
People have talked about the CO2 locking plate screw being bent, and the symptom would be the screw not winding up or down fully. Well mine does wind up and down.
Except it doesn't. In a fully working model, the plate is removable by unscrewing. Mine get stuck at the top.
Disassembly is fairly straightforward. If you can't work it out then perhaps you shouldn't be doing the work yourself.
And there you go. Highest and lowest setting.
New on the left, old on the right. Something is bent, and it is not the screw plate.
These will be replaced also.
So what about the lever? Why won't is close fully? Well, there are some subtle wear on both parts. Can't see it on this photo...
But with an eye of faith, you might spot a tiny more shiny spot on the curve surface.
And on the lever itself...
Again, eye of faith stuff. That will be replaced when the part arrives.
Putting it all back together, it seemed to have improved. Obviously the lever is still to be replaced. The CO2 screw plate is not going to show any effect yet, but look...
Anyway, the CO2 lever has been replaced. Here are them side by side. I'm sure you can guess which is which.
With an eye of faith (again) there might be a bit of a flatter spot on the curve surface. Who knows? It certainly worked this afternoon. If it is easier to pierce tomorrow then maybe that is part of the solution.
Took the gun apart to access the CO2 bulb end of the gas system. I unplugged it from the stem and remove it from the frame.
Sorry a bit out of focus. The stem is short, with a bevel edge (normal). The next challenge is to remove the brass nut so I can replace the seal and the piercing pin. Now if I can just find a screwdriver wide enough to reach both notch... Nope.
Here come McGuiver...
I think this is an M4 washer (or M5 or 6. One of those). Wide enough to lock onto the two notch. Strong enough with withstand the torsion. Shallow enough not to touch the pin. :thumb:
Out come the piercing pin. Can you tell which is new and which is old?
Didn't spot it when I took the photo, but you can see the one on the right is a bit depressed. Probably after some trauma at some point. (Remember my theory, in my case anyway, is that the previous owner improperly installed a bulb. Forced the lever close, causing the bent CO2 screw lever part, the actual lever, and now the piercing pin). Either that or it has seen a lot of CO2 capsules in its time.
For completeness sake, here are the old and new seals.
New on the left, old on the right.
Put it all back together.
So my conclusion? Check all the parts that I've mentioned. Try to mentally work out what is happening and/or why it is not working, and change that bit. The parts, in total, cost me about £30. The only part that may not have needed replacement was the black CO2 locking lever, which would have saved me £8.40. Probably cost much more to bring it to a gunsmith though. Oh well!
Hope that helps someone.
I bought my preloved SW686 and it's amazing. Not sure how old it is but it was working well for me for the past 3 months or so. I did notice however that the CO2 capsule is not puncturing cleanly like my other air pistols that uses screw-type locking system. What I was finding over the last 2 months was sometimes the CO2 won't puncture. I need to screw the plate up, close the lever, release it, screw the plate up a bit more, and close the lever again. Then it will shoot, and shot fine as well.
It finally developed a "fault", or at least the fault became more apparently. The pistol is still shooting, but I can hear the power output is nowhere near as it was before. My 15m zero moving to 25m requires 50 clicks! I was literally lobbing pellets down the garden. Something must be up. Time to investigate further.
One thing I did notice is that the piercing pin appears quite short.
That's the best picture I can get with the phone. But it was still shooting so I ignored it. This is a part that will be replaced in due course.
The other thing I noticed when I bough the pistol was that the CO2 locking lever doesn't go back up fully. Easier to explain with photos.
Again, it was shooting fine. So I ignored that. These parts will be replaced also.
People have talked about the CO2 locking plate screw being bent, and the symptom would be the screw not winding up or down fully. Well mine does wind up and down.
Except it doesn't. In a fully working model, the plate is removable by unscrewing. Mine get stuck at the top.
Disassembly is fairly straightforward. If you can't work it out then perhaps you shouldn't be doing the work yourself.
And there you go. Highest and lowest setting.
New on the left, old on the right. Something is bent, and it is not the screw plate.
These will be replaced also.
So what about the lever? Why won't is close fully? Well, there are some subtle wear on both parts. Can't see it on this photo...
But with an eye of faith, you might spot a tiny more shiny spot on the curve surface.
And on the lever itself...
Again, eye of faith stuff. That will be replaced when the part arrives.
Putting it all back together, it seemed to have improved. Obviously the lever is still to be replaced. The CO2 screw plate is not going to show any effect yet, but look...
Anyway, the CO2 lever has been replaced. Here are them side by side. I'm sure you can guess which is which.
With an eye of faith (again) there might be a bit of a flatter spot on the curve surface. Who knows? It certainly worked this afternoon. If it is easier to pierce tomorrow then maybe that is part of the solution.
Took the gun apart to access the CO2 bulb end of the gas system. I unplugged it from the stem and remove it from the frame.
Sorry a bit out of focus. The stem is short, with a bevel edge (normal). The next challenge is to remove the brass nut so I can replace the seal and the piercing pin. Now if I can just find a screwdriver wide enough to reach both notch... Nope.
Here come McGuiver...
I think this is an M4 washer (or M5 or 6. One of those). Wide enough to lock onto the two notch. Strong enough with withstand the torsion. Shallow enough not to touch the pin. :thumb:
Out come the piercing pin. Can you tell which is new and which is old?
Didn't spot it when I took the photo, but you can see the one on the right is a bit depressed. Probably after some trauma at some point. (Remember my theory, in my case anyway, is that the previous owner improperly installed a bulb. Forced the lever close, causing the bent CO2 screw lever part, the actual lever, and now the piercing pin). Either that or it has seen a lot of CO2 capsules in its time.
For completeness sake, here are the old and new seals.
New on the left, old on the right.
Put it all back together.
So my conclusion? Check all the parts that I've mentioned. Try to mentally work out what is happening and/or why it is not working, and change that bit. The parts, in total, cost me about £30. The only part that may not have needed replacement was the black CO2 locking lever, which would have saved me £8.40. Probably cost much more to bring it to a gunsmith though. Oh well!
Hope that helps someone.
