I found the thread and posted a link. It's pretty much THE BIBLE for that valve work!
This was edited in...I'm not sure why that nut is taking a beating, as there is a striker plate that should be the only thing being contacted. Unless it was hammered in previously and you're just noticing now. Either way, that nut can be replaced if you know the size. It's thread locked on pretty good... Just have to figure out why it's smashed and if it's from the striker or factory damage. Since the valve doesn't have one hole facing up when threaded into the gun, you could leave the two "up" holes unplugged, then possibly some minor porting to smooth airflow. With the other holes plugged and smoothed over you'll still have better efficiency than all of them open and probably not too far off from just one hole unplugged and bored out some. I'm honestly not too familiar with the Galatian, but those were some sweet looking airguns. Best wishes in getting things sorted out and tuned.
Yeah, looks like the BT-65 and AT44 air cylinder and valve. Do an "advanced search" on AT44 mods with Rsterne as the poster. Should come up in the search.
Howdy All,After 7 years.. I decided to pull my old Hatsans out of the their cases.. It seems they did not hold their value well.. so since they are kind of free at this point... I thought why not make them.. all they can be.. Let me lead with the fact.. I have really never modded a gun before to any extent... this is about my Hatsan Galatian .25Decided on doing the value mod with the plugging the holes and JB weld thing. Then when I marked the tube to match the hammer port area.. I discovered that the top hole in the tube was not lined up for the other port.. I changed to a different tube and it is the same. check the photo showing this.. So what do I do now.. does this mean .. I should not move forward on this..Question #2 The nut that the hammer contacts on the valve is smashed on so much.. it is flattened out and disfigured.. is this normal.. see photo.. does this mean something is wrong and needs to be dealt with?When this gun was still under warranty.. it was messed up and only shot at about 700 fps and sometimes it had fps spreads as high as 60 fps on one 13 round mag with good tank pressure.. I sent it back to Hatsan.. they worked their magic on it and it came back shooting in the high 800's and shot dandy.. they did not replace that valve.. but it kept getting worse (the disfiguration of the nut)The photos show the hatsan check sheet.. 25 yard target when it returned.. and the current 25 yard target sheet.. It seems to shot OK on first 13 round mag.. best on 2nd 13 round mag.. then OK on first half of 3rd mag.. so the fact that it does not shoot as good as it did when it first returned.. So if anyone remembers about these old guns.. a bit of assistance would be much appreciated.. BTW ordered Huma reg.. coming from Europeeven after resizing .. I only got half the photos.. if some one answers .. I can post the other 3 photos.. thanksBe Well all
On the Galatians, I believe there is a brass sleeve In the receiver, with the thread for the air tube. If u pull that out, it makes it quite simple to match up the valve to the brass sleeve. Calculate the pitch of the thread…usually all it take is a couple thousands of the shoulder and one hole matches up. Once u have one hole matched up, u can ream that sleave and the valve to size. Then u reinstall the sleeve and ream the whole air transfer port with a reamer from the bottom of the action. Install the barrel and ream the airport of barrel too. Can be done very clean
Per the accuracy issues, I would inspect the barrel. Might be fouled. Hatsan barrels can be made to shoot very well with a bit of elbow grease.Polish out any roughness
Quote from: Corny on August 28, 2022, 12:53:40 PMOn the Galatians, I believe there is a brass sleeve In the receiver, with the thread for the air tube. If u pull that out, it makes it quite simple to match up the valve to the brass sleeve. Calculate the pitch of the thread…usually all it take is a couple thousands of the shoulder and one hole matches up. Once u have one hole matched up, u can ream that sleave and the valve to size. Then u reinstall the sleeve and ream the whole air transfer port with a reamer from the bottom of the action. Install the barrel and ream the airport of barrel too. Can be done very cleanSounds like you have played this game before..Thanks for the info.. Is there any special trick to removing it..Thank youBe Well All
Quote from: Corny on August 28, 2022, 05:05:03 PMPer the accuracy issues, I would inspect the barrel. Might be fouled. Hatsan barrels can be made to shoot very well with a bit of elbow grease.Polish out any roughnessActually.. A barrel polish and crown is on the list.. As well as the Huma.. Might get brave and polish some other moving parts..This project is just trying to turn an old sidelined friend into a more modern piece..Thanks again