Well I have an update, I was looking the 100 over planning on a re seal, when I pumped it a few times, and it seemed to have much better compression. So I took it to 6 a few times dry fired, and when the pump strokes were feeling good and solid, I shot a dozen pellets through it just to see if they did indeed pick up speed. By golly this old girl wants to wake up and play. Left a few pumps in it with it uncocked, will see how she wakes up in the morning.
I shot it through the chronograph today (No target shooting yet) It holds air after 6 pumps and up. I think I can get higher fps with a different valve spring. The original steel one just seams to be real stiff and I think that is why it holds air after only 6 pumps. Also my barrel is REAL tight. It's so tight I actually double checked to make sure I was using a .177 instead of a .22. I actually have to push the pellet into the barrel with the bolt and it's just as tight at the mussel end. They don't just slid in like my 101. I also got the peep sight and the knurled adjusting nut with mine like Elroy did. 6 pumps 458 fps8 pumps 558 fps10 ------- 569 fps12 ------- 591 fps
Quote from: LOKEY on January 19, 2022, 12:49:59 PMI shot it through the chronograph today (No target shooting yet) It holds air after 6 pumps and up. I think I can get higher fps with a different valve spring. The original steel one just seams to be real stiff and I think that is why it holds air after only 6 pumps. Also my barrel is REAL tight. It's so tight I actually double checked to make sure I was using a .177 instead of a .22. I actually have to push the pellet into the barrel with the bolt and it's just as tight at the mussel end. They don't just slid in like my 101. I also got the peep sight and the knurled adjusting nut with mine like Elroy did. 6 pumps 458 fps8 pumps 558 fps10 ------- 569 fps12 ------- 591 fps Wow I just reviewed your numbers, they are very close to what I was getting this morning when I checked it indeed it was beginning to function as intended.
James, If you don't mind answering a few questions about your 100, I would like to add it to the database.1. Is the tube bronze or steel?2. Is the Air intake hole on right or bottom of tube under handle?3. Is the plunger guide steel or brass? Pics of this would be great, if OP doesn't mind
Well I figured out to Pump Assembly issue on my EBay Crosman 100. I tore it all down, including removing the air chamber. I then put the pump assembly back in the tube, guess what it still popped up on its own. Now knowing it was not resistance to stored air or piston hitting the top of air chamber I decided to look at my 101’s and the other 100 I have. I determined the pump arm was not bent by comparing it to one I took out of one of my 101’s and put this 101’s assembly in the 100’s tube, it did not pop open. Since it worked and the 100’s pump arm did not appear to be bent, With the 101 and 100’s pump arms out of the tube I layed them out as if the piston cup was cammed over on the air chamber. I found the 100’s linkage arm bounced up when I pulled it back but the 101’s did not, from there I figured out the problem. There is a little square tension spring under the linkage. On the 101’ pump arm the little square hole on the bottom was filled with the end of the tension spring. However, on the 100 the tension spring end was not filling the square hole. Using a steel hardened steel rod that fit inside the pump arm I was able to drive the tension spring back into position. After doing this I checked again, this time no bounce, from there I cleaned up all the parts and resealed the 100. I put the pump assembly back in and closed it, finally it did not pop open on its own. I then adjusted the pump assembly to get the proper cam over, shot it a few times and it seems to be a stout little shooter. Now that I figured that out I will be trying a new hammer spring to see if I can get it to dump all the air on each shot, from there I will be moving on to the next phases of wood and metal refinishing.
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