N/A S&W 79G Trigger Work and Seals - How difficult?

[vintageairguncollector@gm]

Hey Guys,

I am considering re-sealing my 79G. Not sure if I am the right man for the job. I watched a few Youtube videos - everything looks easy on the videos. I tried to re-seal my Crosman 150 and I succeeded after the 12th attempt. So, could someone who has re-sealed a 79G explain the level of difficulty and possible problems to me, also, my trigger is non-adjustable, and the pull is long, slow, and heavy. Can I install an adjustable trigger? If I can't install an adjustable trigger, is there any way, I can lighten the trigger pull somehow? Pics below show it's a pretty clean pistol with a few small nicks.
I have only been seriously collecting and/or repairing vintage air pistols for 18 months. I do not have much experience, but I am trying to learn. Thank you for any suggestions or guidance you wish to provide about your S&W 79G experiences. Thanks!
Kindest Regards
Randy

 

[Pale_Rider]

The 79g is a fairly simple gun to reseal. Sometimes the valves can be a B to remove. A few whacks with the rubber mallet may be needed.

Get the seal kit with a valve included. Usually the original valve is toast.

For the trigger I would install a lighter trigger spring and polish the contact points.

 

[boscoebrea]

They are not hard to reseal.I read a tip that said get a hair dryer and heat the pistol up some before you use it after reseal so the seal swells a little,anyone ever do this? I got a valve from ebay that is better than the stock one,it is from a shop up in Canada. They also have one for the Snow peak 750.

 

[borne2fly]

Hey Guys,

I am considering re-sealing my 79G. Not sure if I am the right man for the job. I watched a few Youtube videos - everything looks easy on the videos. I tried to re-seal my Crosman 150 and I succeeded after the 12th attempt. So, could someone who has re-sealed a 79G explain the level of difficulty and possible problems to me, also, my trigger is non-adjustable, and the pull is long, slow, and heavy. Can I install an adjustable trigger? If I can't install an adjustable trigger, is there any way, I can lighten the trigger pull somehow? Pics below show it's a pretty clean pistol with a few small nicks.
I have only been seriously collecting and/or repairing vintage air pistols for 18 months. I do not have much experience, but I am trying to learn. Thank you for any suggestions or guidance you wish to provide about your S&W 79G experiences. Thanks!
Kindest Regards
Randy

View attachment 496200

View attachment 496201

Not hard to work on, as others have mentioned. I’ve resealed my 78G and 79G.
Two issues I had …

1) Removing the spacer sleeve out the front. This part must be removed before the top of the gun can come off, and it doesn’t always simply slide out, not even with some coaxing from a rubber hammer. I used a helical bolt extractor and that worked beautifully. Once removed, I drilled small hole in it so I could snag it with a small pick for future disassembly.

2) Removing the valve. Be patient with this. The rear end of the valve has a tube that extends down towards the co2 cartridge. This is not obvious until you pull the valve out, and this tube has an o-ring around it. That o-ring can be a bit stubborn, and you might need to wiggle the valve a bit to break it loose. If it’s truly stuck, try squirting a bit of penetrating oil down by the back of the valve to soak that o-ring a bit. Try to lift the valve out evenly so as not to damage this tube or the hole it fits into.
Under that tube you’ll find a tiny filter screen (unless someone has already pulled things apart and lost it). Sometimes this falls out after you pull the valve. Just be aware that it’s there and keep track of it.

 

[vintageairguncollector@gm]

Thank you for all the help. I will get a kit and get to it. Again many thanks everybody.

 

[marflow 777]

so, first question is it leaking
i would assume it is leaking and if it is where
the piecing cap has to Orings one for the tube standard size and one for the piercing pin, both those as with the rest need to be Urethane
if it is old and never been resealed the Orings will have turn to a black sticky goo in the valve are
the valve stem in the valve is removed by pushing the rear of the valve into the body and the connecting tube-pipe is not fragile
the valve screws 4 of them are round bottomed slot screws and they are soft at hell so take care to the point of making a screwdriver fit correctly and the why is if you damage them, it is poor form
the brass valve stem can be rebuilt but you have to have urethane sheet good and the imagination of how to press not pound the two piece valve apart
you can see at the JG site they are replacing the seal but not taking it apart
the problem of the top coming off has been covered and make the trigger adjustable on a nonadjustable pistol i have never seen
the cap can be R&R by take the small Oring retainer off with a screwdriver that has had the middle ground out
are they easy yes are they simple no and of course easy for me and others, could be a problem for just as many
the goal is once and done

 

[willy]

On the ex vale just blow compressor air into it and it come;s apart.

 

[borne2fly]

On the ex vale just blow compressor air into it and it come;s apart.

Are you blowing air into the chamber where the co2 cartridge normally sits, after loosening the screws that hold the valve body? I never thought of that … I like it!
And for those who do not have a compressor, could they fill the co2 chamber with water and then screw the cap back on, using the hydraulic pressure to push the valve out? Just a thought.