I was installing a PP 720 on a friend's Impact mk2 with the small plenum, and ran into a couple issues. First, the "valve tube end"(part 101 in M3 manual) was too large to fit into the block. My friend called UA(where plenum kit was purchased) to get the correct part that fits the earlier guns where this is an issue, and for some reason, couldn't get any help. I think they were insisting he had the correct part, even though it definitely is too large to fit. He then called FX, and they didn't have any, but said they would send a sanded down one to him. I figured I would go ahead and sand this one down in the mean time to fit. I sanded what I thought was just enough for it to fit, and it is snug with no wobble. Well, it leaks like crazy there when I try to air the gun up. The only thing I can think is maybe I sanded the end or the ridges by the o-ring grooves a little too much. There really isn't a whole lot going on right there as far as sealing surfaces go.
My question is this: Do you guys think I just messed up on my sanding job, or is there something else I should be looking for? Have any of you guys sanded this part and had issues? It would have been a cake walk to fix, were it not offset, because I just would have chucked it into the lathe... I tried changing the o-rings, and slightly larger ones will just get cut up. I also replaced the big o-ring on part I sanded too. It is definitely leaking where E101 goes into the block. I didn't think I sanded it so much that I'd get leaking there, but I most certainly could have. The part from FX will show up eventually I'm sure, but I just wanted to make sure I'm not missing something else here. I'm not an Impact expert, and have never kept up with all of the little things concerning them whole lot. I have done a ton of tuning of air guns, including my heavily modified Maverick. I'm just not as familiar with the Impacts is all. I feel pretty sure my issue is with E101, but any input would be appreciated!
My question is this: Do you guys think I just messed up on my sanding job, or is there something else I should be looking for? Have any of you guys sanded this part and had issues? It would have been a cake walk to fix, were it not offset, because I just would have chucked it into the lathe... I tried changing the o-rings, and slightly larger ones will just get cut up. I also replaced the big o-ring on part I sanded too. It is definitely leaking where E101 goes into the block. I didn't think I sanded it so much that I'd get leaking there, but I most certainly could have. The part from FX will show up eventually I'm sure, but I just wanted to make sure I'm not missing something else here. I'm not an Impact expert, and have never kept up with all of the little things concerning them whole lot. I have done a ton of tuning of air guns, including my heavily modified Maverick. I'm just not as familiar with the Impacts is all. I feel pretty sure my issue is with E101, but any input would be appreciated!
I mainly wanted to make sure there wasn't something else I should be looking for, aside from the piece I sanded.
