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PostPosted: Tue Oct 24, 2017 12:51 pm 
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Location: Thunder Bay,On.
Phantom,Venoms, Optimus, etc.A good breech seal replacement thats readily available is the o-ring type from your local hydraulics shop. Perfect fit....no need to modify....Apparently these particular seals are common in the industry.....and you can't beat the price..$…56 cents each.
109 Viton V75 :D ....

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PostPosted: Tue Oct 24, 2017 3:04 pm 
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Location: Dryden, Ontario
Thanks for the info,I need some seals and I didn't want to wait a week from the Gravel Agency.


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PostPosted: Tue Oct 24, 2017 8:07 pm 
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How does one test the seal, other than to look for dents and nicks? Thought I once read about placing a tissue paper atop the breech and firing the gun. But no idea what to watch for, whether a certain amount of air escaping is normal or how much air would indicate time for a new seal. Any tips on a test?

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PostPosted: Tue Oct 24, 2017 8:22 pm 
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No air should escape, the tissue should not move at all. If it does, replace the seal if it's nicked, or maybe shim it if the face is still nice.


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PostPosted: Tue Oct 24, 2017 9:13 pm 
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Right.....air can also escape from the underside of the seal also....I replaced 3 perfectly good crosman seals with the one mentioned and my fps jumped 18, 21, and 23....I never realized the stock seals were leaking.....I don't think they fit perfectly flat on most guns or I wouldn't be seeing an fps increase every time I switch seals.....for $.56 cents......worth a try........remember its not just about fps but a good s.d. and e.s. make for better accuracy....With springers we need all the help wih accuracy we can get... :D

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PostPosted: Wed Oct 25, 2017 8:22 am 
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I have flipped mine over and put some dental floss under it to get a better fit and like new.


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PostPosted: Wed Oct 25, 2017 11:00 am 
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mooseslayerjc wrote:
I have flipped mine over and put some dental floss under it to get a better fit and like new.

careful when doing this or getting the wrong seal you might experience a bit of barrel droop...

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PostPosted: Wed Oct 25, 2017 2:50 pm 
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Doesn't the crosman seal also act as a buffer to keep the metal piston from slamming into the compression tube?


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PostPosted: Wed Oct 25, 2017 3:38 pm 
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leadslinger wrote:
Doesn't the crosman seal also act as a buffer to keep the metal piston from slamming into the compression tube?


As far as I know its the cuishon of compressed air preventing the piston slam and not the actual seal itself......which is why dry fires and very light pellets can be damaging to seals and compression tubes.....and springs too...you would have to have just about a mangled, carved up seal to let THAT much pressure escape and cause piston slam with average weight pellets.......

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PostPosted: Wed Oct 25, 2017 3:58 pm 
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Ace wrote:
mooseslayerjc wrote:
I have flipped mine over and put some dental floss under it to get a better fit and like new.

careful when doing this or getting the wrong seal you might experience a bit of barrel droop...


Good point to ALWAYS check for barrel droop.....even from the factory many guns have a little...or a lot of droop...

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PostPosted: Wed Oct 25, 2017 3:59 pm 
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mooseslayerjc wrote:
I have flipped mine over and put some dental floss under it to get a better fit and like new.


Good idea.....double the seal life :D ....

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PostPosted: Wed Oct 25, 2017 9:02 pm 
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Location: Ontario, Canada
MyCrosman wrote:
Ace wrote:
mooseslayerjc wrote:
I have flipped mine over and put some dental floss under it to get a better fit and like new.

careful when doing this or getting the wrong seal you might experience a bit of barrel droop...


Good point to ALWAYS check for barrel droop.....even from the factory many guns have a little...or a lot of droop...


You can sand the back side of those Viton 75D seals if they are pushing your barrel into droop. Just rub them on some 100-220 grit paper to thin them out.


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PostPosted: Sun Oct 29, 2017 7:32 pm 
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Ideally you should sand the breech face so the seal has a chance at sealing.
The guns seal groove depth is random so what fits on one won't necessarily fit another so be ready to shim as needed.
There are two types of Crosman setups as far as the breech seal is concerned, the old style where the barrel stops on the seal, which seals great but changes as the seal compresses depending on age or your latch. The newer type stops on the pin that the latch catches so shimming is more important. You want max seal pressure but no so much that it pushes off the pin. Should make sense if you look at it...
Btw you can put grease around the O-ring to witness any blowby 360 degrees. There usually is some but I rekon it also depends on the guns pressure and pellet used. To me it's more of an eyeball fitment process but however you do it it's no doubt better than the oem seal.

leadslinger: It's the main seal that basically does that, but it needs the breech seal to hold in order for that to work its best, and it needs a pellet to act like a cork. Ideally a heavier better fitting pellet but whatever works for you. The piston still hits but that air slows it down a lot. If you plug the breech it will stop the piston before impact and you'll feel and hear the difference. So consider a dry fire as max piston impact (air escaping), a plugged breech as no impact (no air escaping) and all the seals and pellet working as somewhere in between (only air escaping is what's pushing the pellet, which is why a heavier one works better).


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