I did not get a leak until I modified the valve, when I took it apart to check, and add a wrap of teflon tape, I did discover some trash in the valve it may have been created when I spun the poppet against the valve to get a tighter seal, but must of missed some residue from the process. Your best bet now would be take the valve out and open it clean it and the pump tube and retest for leaks.It could possibly be a cracked poppet from shooting in cold conditions
Worse case, if you don't feel you can return it it to post it as a basket case here in the classifieds and sell it to someone that wants it as a parts gun.
Is Crosman selling parts for this rifle yet? My piston has a nasty gouge right above the pump cup. That might not matter, but it makes me wonder if the pump tube is scored up.
Quote from: Spacebus on February 08, 2022, 09:24:01 AMIs Crosman selling parts for this rifle yet? My piston has a nasty gouge right above the pump cup. That might not matter, but it makes me wonder if the pump tube is scored up. There is no EVP as yet - still too new. The valve is the same as 13xx guns so those parts are available.The gouge, while not demonstrating excellent QC, would not be an issue if not to the cup retention groove.
The valve is the same as the 13xx and the piston is close to the 2100 piston.That gash on the piston tells me there was a bur in the tube and probably nicked the valve o-ring.
Quote from: Tack Driver 10 on February 08, 2022, 10:23:37 AMThe valve is the same as the 13xx and the piston is close to the 2100 piston.That gash on the piston tells me there was a bur in the tube and probably nicked the valve o-ring.I guess I'll be taking it apart soon. Something else worth noting, I almost always get a puff of air when I shoot, and have since new. Is this a TP alignment problem?
Quote from: Spacebus on February 08, 2022, 10:58:32 AMQuote from: Tack Driver 10 on February 08, 2022, 10:23:37 AMThe valve is the same as the 13xx and the piston is close to the 2100 piston.That gash on the piston tells me there was a bur in the tube and probably nicked the valve o-ring.I guess I'll be taking it apart soon. Something else worth noting, I almost always get a puff of air when I shoot, and have since new. Is this a TP alignment problem?Right, usually a TP or probe sealing issue.Squirt a few drops of oil into the TP area and close the bolt.Fire a pellet and oil should show where the leak is.
Quote from: Tack Driver 10 on February 08, 2022, 12:11:51 PMQuote from: Spacebus on February 08, 2022, 10:58:32 AMQuote from: Tack Driver 10 on February 08, 2022, 10:23:37 AMThe valve is the same as the 13xx and the piston is close to the 2100 piston.That gash on the piston tells me there was a bur in the tube and probably nicked the valve o-ring.I guess I'll be taking it apart soon. Something else worth noting, I almost always get a puff of air when I shoot, and have since new. Is this a TP alignment problem?Right, usually a TP or probe sealing issue.Squirt a few drops of oil into the TP area and close the bolt.Fire a pellet and oil should show where the leak is.Is there any trick to this? My SPA guns have a seal above and below the TP, but this Crosman setup only has one. I have a "fancy" MAP TP with a new seal, and it was doing the same thing. I feel like the problem was even worse with the Baker Breech.
Quote from: CraigH on February 08, 2022, 09:40:29 AMQuote from: Spacebus on February 08, 2022, 09:24:01 AMIs Crosman selling parts for this rifle yet? My piston has a nasty gouge right above the pump cup. That might not matter, but it makes me wonder if the pump tube is scored up. There is no EVP as yet - still too new. The valve is the same as 13xx guns so those parts are available.The gouge, while not demonstrating excellent QC, would not be an issue if not to the cup retention groove.Not the best photo, but it should give an idea. I saw someone posting that a 760(?) piston and valve assembly are almost the same length, but I can't remember who posted it or which thread. I think the Mountain Air flat top piston would work with the right length threaded rod. Any advice on taking out the guts? I've never taken apart a pumper, just my SPA PCPs
With eight pumps I'm averaging 640 FPS with 14.3 CPHP (13 FPE), which is close to what I was getting before, a touch faster. I accidentally went up to nine pumps a couple of times and hit 665 FPS (14 FPE), this is more in line with what other people are seeing, just a touch lower. For whatever reason it seems like my c362 wants an extra pump to match velocities with what other people are seeing. It's like I'm shooting at high altitude, but my house is only 150' above sea level. Unfortunately I don't have another chronograph, but I wonder if mine "reads low" or something. It clamps to the muzzle, so I assumed it would read higher compared to what others are seeing.
Quote from: Spacebus on February 08, 2022, 09:48:00 AMQuote from: CraigH on February 08, 2022, 09:40:29 AMQuote from: Spacebus on February 08, 2022, 09:24:01 AMIs Crosman selling parts for this rifle yet? My piston has a nasty gouge right above the pump cup. That might not matter, but it makes me wonder if the pump tube is scored up. There is no EVP as yet - still too new. The valve is the same as 13xx guns so those parts are available.The gouge, while not demonstrating excellent QC, would not be an issue if not to the cup retention groove.Not the best photo, but it should give an idea. I saw someone posting that a 760(?) piston and valve assembly are almost the same length, but I can't remember who posted it or which thread. I think the Mountain Air flat top piston would work with the right length threaded rod. Any advice on taking out the guts? I've never taken apart a pumper, just my SPA PCPsThat (mostly) transverse gash was not done by a burr in the tube. Unless the piston was turned while inserting into the tube.The only issue on disassembly is removing the pin at the front. Really should be done with a punch that has a centering nub. It can be done with a standard punch of correct size with appropriate care.
When I first took the breech off of my rifle I paid close attention to how it was put together, especially the orientation of the TP.EVP of 1322 has long side up
just a note about that chrony you are useing i have the same one and yes mine reads 10 to 30 fps lower then other ones no big deal as long as you know it .especialy for the price of them 30 bucks to your house i have run 500 rds through mine and still works.
Can you link to an appropriate punch? I don't own any and might as well get the right tool for the job. Can you just push the valve out from the back once the piston is out, like a PCP?