So I have my dad's Crosman 150. First an observation then my issue. I put an old (late 1980's early 90's) CO2 cartridge in and heard all the gas leak out the seals. SO I bought some new cartridges and the same thing... But the new cartridges are maybe a 16'th of an inch longer. maybe 32nd. perhaps the crimping is what was different. None the less I bought a new seal kit, changed the seals put it all back together. Now it holds air like a champ BUT wont fire any of it. Took it all apart, put the end cap through a wall as it was still under pressure! rechecked all my alignments and it was correct. Another cartridge and still wont fire. So what I''m finding it seems like the piercing pin occludes the "firing cylinder" preventing gas to enter. SO what do I do? Do I drill the hole slightly larger? " sand it bigger? Sand the piercing pin? Has any one else had this issue? Done this before? The positive, it holds gas well just wont direct it through the bore when the hammer hits.
well you should have read the owners manual because it states that if the cap doesn't unscrew easily it is under pressure so after you pierce the cartridge by cocking the pistol and pulling the trigger, the piercing pin should be retracted back into the valve and the gas can flow into the valve body so has the valve been rebuild right, doesn't sound like it the pistol worked before, it sat for an unknown amount of time and the seals and or o-rings went bad and now will not fire and the only thing now is the valve doesn't work right
You lucked out that no one got hurt with the gun being under pressure when you started your disassembly. Expect that won't happen again. marflow gave you all the info one could need with his links not much I can add.