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PostPosted: Sat Dec 21, 2013 11:24 am 
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Joined: Sun Nov 20, 2005 10:28 pm
Posts: 1275
Location: Southern Ontario
My shinsung 201 9mm developed a very small leak out the pressure gauge so I decided to disassemble the gun and replace any orings that were defective. So out of curiosity I'de disassemble the whole gun and made a post about it.
I am not claiming this to be a tunning job! I am not a airsmith or claim to be one ! This is an information post for anyone who may be wanting to tackle the disassembly of theShinsung 9mm. Some day I may make a youtube video of the disassembly. It would be the only one in existance I'm sure. And yes it is holding air perfectly ! I havn't got out to shoot her yet but I know there will be a diffrence!
Enjoy!
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I did some minor polishing and seal replacement as you will see.
Let’s start at the muzzle end and remove the gauge . Remove dust cap and sight cover.
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Remove the fill port
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Fill port removed
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Remove the two locking rings. I didn't have a small spanner wrench so I made this tool.
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Tap the end cap off with a wooden dowel
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Unscrew the monometer gauge. I pinched a leather strap with vise grips to turn the gauge
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Pressure gauge out
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Unscrew the aluminum cap on the end of the gauge
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To get to get at the stem seal insert a flat blade screw driver into the guage and hold the other end with another flat blade
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The threaded cap comes off the end of the stem.
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Go inside and remove the brass nut that houses the oring. This is what was leaking
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Oring in nut. The leaking Culprit!
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I had to ream out a new oring so it would fit the stem. The ring on the left is the reamed out one. The oring on the right is what the brand new oring looked like. Too small in the inside diameter especially after getting tightened too. It had to be modifide
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This is the toolsI used to ream the oring
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Fits perfect. I lubed the oring and reassembled the gauge.
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Next I lossend the fill inlet tube with a small drift through the port hole.
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Remove forestock one screw.
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Remove screw that holds trigger in place
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Trigger out
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Remove two scope rail screws. Note the longer screw toward the rear of gun
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Separate action tube from cover
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The transfer port dowl will stay in one of the two pieces. Take it out. Inspect and or replace both orings on port
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Pull off breech cover and inspect barrel oring
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Unscrew barrel and remove. Plastic barrel spacer comes out with barrel too.
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You will need an 18 inch flat wide blade screw driver or a flat blade that fits in a socket for the next procedure. I made this flat blade and cemented it into a ¼ inch socket.
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Reach up into the air cylinder with the flat blade and unscrew the end cap 3-4 turns. This loosens the expanded oring from the inside of the cylinder.
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Remove the three screws and the scope rail nut so the valve can be pushed out the breech end.
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I used a broom pole to go up inside the air cylinder from the muzzle end and push the valve out he breech end.
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Unscrew with your hands the valve, You can see the delrin valve and spring
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Remove the delrin valve and with a flat blade screw driver remove the valve stem oring cap.
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Inspect oring
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The original valve (wrapped in brass) was replaced a few years back. The new valve stem had been ground down for a power tune at the time. I believe it was to allow more air flow out the exhaust valve.
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Here you can see the valve stem inside the exhaust valve body and how the smaller stem most likely has an affect on air flow out of the valve.
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I polished the cylinder only the first 4-5 inches where the hammer slides. I started with super fine steel wool with a mild compound
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I finished the polish with cotton cloth and blew out and degreased cylinder.
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Buffed up the hammer
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Nice and smooth
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Reinstall the exhaust valve assembly and install three screws and the scope rail mount nut
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A very light coating of Honda moly is is applies to the inside of cylinder up to valve for the polished hammer to slide freeer
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Install thrust washer and hammer spring. Make sure tit of washer is facing forward so it will engage with detents on cocking bolt
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You can insert cocking bolt which helps to hold the hammer from turing when you are compressing the spring and putting in the pin, Then pull the bolt back out again.
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Screw barrel back into place . This is a good time to put some rust preventer on the part of the barrel that is hid under the rear sight
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I used the leather and vise grip to tighten the barrel back up
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Slide the plastic barrel spacer between the barrel and air cylinder
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Reinstall the air inlet tube and snug it up
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Reinstall the pressure guage and snug it up. I used the leather strap again.
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Set the front cover in place and tap it home with a wooden dowel
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Make sure your gauge is straight before you install the end caps. If the gauge needs to go clock wise more you can use the slot in the aluminum end cap to turn it but if it needs to go clockwise you may have to tap the end cap off again and turn ut back with the strap. If you used the slot in the end to turn it back the cap will probally just unscrew
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If your gauge is straight the install the two end collars
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Reinstall the barrel seal and the brass breech cover
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Inspect the transfer port dowl and replace orings if necessary. Lube and install the transfer port into the cover or on the cylinder exaust tube. I chose to install it into the cover. I also polished the ports to a bright smooth finish.
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Almost a mirror finish. Both ends
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Bring the two pieces together
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Install the scope rail with two screw
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Install trigger assembly and tighten screw
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Install forestock
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Done, Clean off grease and prints.
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Airforce Condor 22 cal
UK Webley Patriot 22 cal
Weihrauch 80 .177 cal
Diana 350 Magnum 22 cal
EunJin Sumatra 22 cal 500cc
AirArms 410 22 cal
Telly .177
BSA Mercury 177 cal
Salavia 618
Shinsung 201 9mm
AirArms Tx200 .22 cal
Diana 54 Airking .22 cal


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PostPosted: Sat Dec 21, 2013 11:31 am 
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Joined: Thu Oct 13, 2005 6:52 pm
Posts: 7140
Location: Vancouver Island BC
Nice work and great photos .I have been thinking of buying one of them all ways wanted a big bore gun just have 25 cal now ........


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PostPosted: Sat Dec 21, 2013 11:40 am 
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Posts: 4118
Very nice gun, and great documenting and pictures thanks for sharing. :wink:

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"A candle loses nothing by lighting another candle"

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PostPosted: Sat Dec 21, 2013 11:45 am 
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Posts: 4080
Location: Somewhere In Time
lauchlin wrote:
Nice work and great photos .I have been thinking of buying one of them all ways wanted a big bore gun just have 25 cal now ........


X2 excellent write up and pictures

Brent, stop thinking and start buying, they are a blast to shoot, I shot a hole CLEAN THRU A HOCKEY PUCK at 75yds with my .45cal Sam Yang, crazy guns :shock: :wink: :lol:

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"Are you guys silly? I'm still gonna send it..."


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PostPosted: Sat Dec 21, 2013 12:04 pm 
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Joined: Sun Feb 27, 2011 11:41 am
Posts: 970
Just had my 9mm Shin Sung Fire 202s repaired (leaked air out fill port) by AirgunSource.....they replaced 11 O-rings.

After seeing your report....glad I let them do the job for me......


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PostPosted: Sat Dec 21, 2013 12:12 pm 
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Joined: Sun Oct 26, 2008 6:14 pm
Posts: 1343
Location: quebec
you assemble everything ,?,
no parts stay on the table after you finished ? :lol:

you do it well whit the hammer polishing etc,,,,
you surly gain a fps or 2 ,after ll that,,,,,,



target man

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9 mm cal,discovery pumper
.25 cal,crosman pumper


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PostPosted: Sat Dec 21, 2013 12:26 pm 
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Joined: Fri Jul 16, 2010 4:09 pm
Posts: 1029
Location: Southern canada
Excellent job, and well documented! Others will come to appreciate this thread a lot.

I'm thinking about getting into big bore myself, eventually of coarse. I don't have the air supplies for such an air hungry guns yet. One day!

Thanks again for such a great overhaul procedure

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Benjamin Classic
Benjamin Trail NP
Webley Alecto .177 (Custom)
Smith & Wesson 686
Hatsan AT44MW-10 .177
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PostPosted: Sat Dec 21, 2013 4:23 pm 
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Joined: Mon Jun 24, 2013 6:54 pm
Posts: 361
Location: Earth
Great post.


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PostPosted: Sat Dec 21, 2013 5:08 pm 
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Joined: Sun Nov 20, 2005 10:28 pm
Posts: 1275
Location: Southern Ontario
Thanks for all the positive feed back from everyone ! If anyone sees something that looks dangerous please post. I want this post to be used as reference and not to lead anyone wrong including myself.

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Airforce Condor 22 cal
UK Webley Patriot 22 cal
Weihrauch 80 .177 cal
Diana 350 Magnum 22 cal
EunJin Sumatra 22 cal 500cc
AirArms 410 22 cal
Telly .177
BSA Mercury 177 cal
Salavia 618
Shinsung 201 9mm
AirArms Tx200 .22 cal
Diana 54 Airking .22 cal


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PostPosted: Sat Dec 21, 2013 6:55 pm 
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Joined: Wed Mar 09, 2011 8:44 pm
Posts: 1137
Location: toronto
Yes i see something dangerous, i dont have that rifle, nice post im gonna polish my 2260 hammer, i dont know why i never i thought about that im gonna make it look like a mirror

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crosman 2240 (modded to target pistol)
crosman 2260 tactical
Beretta px4


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