how to repair fwb co2 cylinder

sammm1 · Post by **sammm1** » Mon Jun 30, 2014 9:13 am

Does anyone has experience disassembling a fwb mod2 CO2 cylinder?
I have the o-ring to fix the leak but cannot unscrew the valve from the cylinder. I don't want to do heat it fearful that may ruin the metal surface. Any one has done that or knows any air gun repair service who works on older fwb air guns? thanks for any suggestions.

PaulB · Post by **PaulB** » Mon Jun 30, 2014 10:43 am

The last time I fixed a leaky cylinder I remember using a large bench vice to hold the cylinder, with a piece of rubber wrapped around it to hold it snuggly and avoid any damage. I then took off the brass threaded piece using a large adjustable wrench, at least a foot long, being sure to dial it to the exact size of the hex. I may have even put a pipe over the wrench handle to increase the length for more leverage.

sammm1 · Post by **sammm1** » Mon Jun 30, 2014 3:58 pm

Thank you Paul. I will try your method.

Rover · Post by **Rover** » Mon Jun 30, 2014 7:43 pm

You could ask Pilk.

dsergison · Post by **dsergison** » Mon Jun 30, 2014 7:47 pm

the rubber or something really gripy really is the key. squashing it really is bad for it.
I would even look for a nylon and urethane or gum treated strap wrench.
http://www.webbikeworld.com/ducati-moto ... wrench.jpg

but when you use it you want the strap wrench to go basically completely over center, like shown here, not like above, so it does not push in on one spot of the cylinder. you can further pad it under the handle to prevent point loading.
http://cfnewsads.thomasnet.com/images/l ... 610341.jpg
you

or, bore a hole in a piece of wood, cut the wood in half so you have two half circles, and put the rubber and the cylinder in there and put that in the vise.

anything to prevent simply squeezing the cylinder from 2 sides..

boring a hole in wood is cheap and easy if you have hole saw or such available.

squeezing the tube near the end, especially unevenly also squeezes it tighter onto the threaded caps I believe.

Rover · Post by **Rover** » Mon Jun 30, 2014 9:17 pm

Actually, you'll probably need to turn the cylinder a fraction of an inch to release it.

If there is no air in it, you might LIGHTLY heat it (hair dryer? or torch).

PFribley · Post by **PFribley** » Tue Jul 01, 2014 8:02 am

I have access to a lathe. Its really the best way to hold the cylinders.

sammm1 · Post by **sammm1** » Tue Jul 01, 2014 6:58 pm

Thank you for all the suggestions. I'll share my result once I have the cylinder disassembled.

Gnr527 · Post by **Gnr527** » Sat Jul 19, 2014 3:56 am

I cut an 1/8th inch thick strip of rubber and wrapped it inside a jubilee clip - tightened it gently around the cylinder body - carefully tightened a vice on the upright cylinders nut - and used a wrench on the jubilee clip.

I've done several BUT use care - don't bully it.

John