Replace the seal. If you can push it down, even slowly with your finger over the port its no good. Shifting POI can be a seal problem. Replace the seal. Definitely. I wasn't aware of these two conditions.
I thought you were just doing a tune and all was well before hand.
What does polishing the outside of the spring do? I just don't remember hearing of anyone doing that.
With the seal on the loose side, not holding pressure and POI shift. I would definitely replace it. After you take it off, press on the face of the seal and see if it reveals a split on the backside. Sometimes the seal will split in circular pattern that isn't easily detected on the face of the seal statically. When this happens it will seal to wide varying degrees and cause POI shifts. With this condition the bypassing pressure through the face of the seal balloons out seal diameter and the seal will spin easily. Brand new unfired seals can be turned by hand but should have some resistance
Quote from: Bayman on March 25, 2021, 05:01:17 PMI thought you were just doing a tune and all was well before hand.well, basically wanted to check out what is going on inside the rifle, why I am having accuracy issues, but since I have her open, yes, I am tuning her too.Just made a plastic piston sleeve, deburred the cocking slot, will be polishing the outside of the spring as soon as i can get a hold of some 1200 grit sandpaper, found some online at Harbor Freight, will go check it out.
Quote from: byhsu on March 25, 2021, 05:35:33 PMQuote from: Bayman on March 25, 2021, 05:01:17 PMI thought you were just doing a tune and all was well before hand.well, basically wanted to check out what is going on inside the rifle, why I am having accuracy issues, but since I have her open, yes, I am tuning her too.Just made a plastic piston sleeve, deburred the cocking slot, will be polishing the outside of the spring as soon as i can get a hold of some 1200 grit sandpaper, found some online at Harbor Freight, will go check it out.your local auto parts store will have your sand paper in stock
No visible scraping inside the bore where the seal rides?
Quote from: avator on March 25, 2021, 05:47:34 PMWhat does polishing the outside of the spring do? I just don't remember hearing of anyone doing that.Makes it look smooth and shiny? i don't know, i was given that advice by SpiralGroove.
The bore is probably fine. I'd just get a new seal. Everyone has their preferred seals. I've used the JM and Weihrauch parachute seals and the Vortek seals. The Vortek seals are a cupped seal design and not a parachute design. I think JM has a second line of seals of this design as well as another company in Australia that are supposedly very good. I get the most power and life out of the Vortek. I just changed out one in my Hw95 that I installed in 2016 and probably has ten thousand plus rounds through it. They are a hard moly impregnated rubber. They are initially very tight so lots of people here whine about that. After a day or two of shooting they conform to the bore and loosen up. It's pretty common for the gun to pick up 20-40 fps from when first installed. Just changing to this design over a parachute design makes more power with no ill effects on the shot cycle. This will start a s-storm of opinions. You can do what you want this is just my actual experience.
Quote from: byhsu on March 25, 2021, 08:26:32 PMQuote from: avator on March 25, 2021, 05:47:34 PMWhat does polishing the outside of the spring do? I just don't remember hearing of anyone doing that.Makes it look smooth and shiny? i don't know, i was given that advice by SpiralGroove.I heard of polishing the ends of the spring where they ride on the guide/thrust washer and the tophat/piston but never heard of polishing the outside of the spring.... maybe a misunderstanding.
Quote from: avator on March 25, 2021, 10:13:25 PMQuote from: byhsu on March 25, 2021, 08:26:32 PMQuote from: avator on March 25, 2021, 05:47:34 PMWhat does polishing the outside of the spring do? I just don't remember hearing of anyone doing that.Makes it look smooth and shiny? i don't know, i was given that advice by SpiralGroove.I heard of polishing the ends of the spring where they ride on the guide/thrust washer and the tophat/piston but never heard of polishing the outside of the spring.... maybe a misunderstanding.Below is a quote from Spiral Groove:I usually sand the entire outside, spring length.
Quote from: byhsu on March 25, 2021, 10:19:40 PMQuote from: avator on March 25, 2021, 10:13:25 PMQuote from: byhsu on March 25, 2021, 08:26:32 PMQuote from: avator on March 25, 2021, 05:47:34 PMWhat does polishing the outside of the spring do? I just don't remember hearing of anyone doing that.Makes it look smooth and shiny? i don't know, i was given that advice by SpiralGroove.I heard of polishing the ends of the spring where they ride on the guide/thrust washer and the tophat/piston but never heard of polishing the outside of the spring.... maybe a misunderstanding.Below is a quote from Spiral Groove:I usually sand the entire outside, spring length.Wow... well, you know what they say... life is full of firsts.
Yeah Guys,I just make sure the spring slides nicely in the plastic sleeve. This maybe overkill, but I'm usually pretty anal about making sure nothing has been missed .
Advertise Here
Share This!