Walther CP3 - problem with co2

[Mark D]

Make sure that you have put the cylinder on tightly enough. If you just screw it on till the valve opens and 'grabs' the cylinder,it will not maintain pressure and give you low power shots. Don't over tighten, but it needs to be nipped up hand tight.

If you need to reseal and can do it yourself try here:http://www.altecweb.com/home.asp?cat=RangeB05

[Discocom]

Many thanks for all the advice. I wonder if the cylinder was slightly overfilled, which caused the problem as working fine now.

I have a second cylinder but need to replace the seal as old one was hard and came out in bits.

Does the seal need to be a green one, as my understanding is that it has to be resistant to co2?

[Bjacobs571]

Yes you need to use a seal of the correct material. I got mine from Protek supplies

[nige346]

Many thanks for all the advice. I wonder if the cylinder was slightly overfilled, which caused the problem as working fine now.

I have a second cylinder but need to replace the seal as old one was hard and came out in bits.

Does the seal need to be a green one, as my understanding is that it has to be resistant to co2?

The colour's not important, Seals are often coloured for the industry they are used in (ie green/blue are often used in the food trade) you will need either polyurethane or Silicon for CO2, If the seal is to be moved on a regular basis (ie Cylinder to pistol seal) you will need Polyurethane as silicon will be too soft. Protek may have some but failing that Kent Bearings and Seals in Rochester or Seal Force, You'll get a pack of 10 for about the same price as one from Walther, Brand/colour isn't important at all, an O ring is an O ring as long as it's the correct material & size.

[Mark D]

The colour's not important, Seals are often coloured for the industry they are used in (ie green/blue are often used in the food trade) you will need either polyurethane or Silicon for CO2, If the seal is to be moved on a regular basis (ie Cylinder to pistol seal) you will need Polyurethane as silicon will be too soft. Protek may have some but failing that Kent Bearings and Seals in Rochester or Seal Force, You'll get a pack of 10 for about the same price as one from Walther, Brand/colour isn't important at all, an O ring is an O ring as long as it's the correct material & size.

What Nige said is correct about aftermarket suppliers. Had good experience with Seal Force - you can find them *b*y

[Bjacobs571]

it is all very well to say go to a o ring stockist but what size are the correct ones. Size is perhaps the most important thing

[nige346]

These are the sizes you'll need

Valve seal 6.0 x 2 xxxx OPN 2490021
Bolt 4.0 x 1 OPN 2472309
Barrel seals 9.0 x 1.5 OPN 2472295
Cylinder Seal 14.0 x 3 xxxx OPN 2459817
Cylinder fitting 15.0 x 2 OPN 2476266

OPN = Original part number
xxxx = These must be Polyurethane as in constant CO2 contact

[Bjacobs571]

These are the sizes you'll need

Valve seal 6.0 x 2 xxxx OPN 2490021
Bolt 4.0 x 1 OPN 2472309
Barrel seals 9.0 x 1.5 OPN 2472295
Cylinder Seal 14.0 x 3 xxxx OPN 2459817
Cylinder fitting 15.0 x 2 OPN 2476266

OPN = Original part number
xxxx = These must be Polyurethane as in constant CO2 contact

Many Thanks for the information. I have a couple of cylinders i need to reseal. at the moment I am using my good CP2 cylinders on all the CP series pistols they fit on.
I looked at the seal force website and they didn't seem to do any polyurethane o rings at least not on there eb-y store

[nige346]

it is all very well to say go to a o ring stockist but what size are the correct ones. Size is perhaps the most important thing

My missus say's size ain't important

All sizes and part numbers added to thread

[Discocom]

Thanks again for the seal advice, will pop into Protek next time I’m down that way (any excuse!)

[gingernut]

[QUOTE=Discocom;7412860]Many thanks for all the advice. I wonder if the cylinder was slightly overfilled, which caused the problem as working fine now.



Sorry I was a bit terse there.

An overfill can give the hammer too much pressure to overcome causing failure to fire.
Check the weight of the cylinder,usually indicated on the side.
On my FWB you can let a bit of co2 out if you have overfilled.

[zooma]

Many thanks for all the advice. I wonder if the cylinder was slightly overfilled, which caused the problem as working fine now

I have owned several CP1, CP2 and CP3 pistols and have also had a mystery leak now and again that has sealed itself too.

This usually followed a period of non-use and is one of the reasons why I always try to exercise all of my pistols and rifles as often as possible - leaving them unused does not do them any good at all!