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PostPosted: Mon Sep 30, 2013 9:20 am 
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Location: Fredericton, NB
after receiving my Ruger Airhawk last week, been looking around to find the right seal for the breach block, the original one was quite flat to the breach, i think i finally found it, i made several searches on google and other forums, the number given for the O ring was #110, easily found some of those and also purchased a size smaller, so #109

the weird thing is that the original seal seemed to be a size between 109 and 110, so first i tried the 110, it worked but wouldn't last past 75 shots, the seal would just tear itself, and then the pellets would fly all over the place, i went threw 2 of those before i gave up, then i tried the 109 this AM, went outside to re-sight the scope, you'll see the results from the pics i included, also included a pic of 3 seals, starting from the left, a new 109, in the middle, a used 110, and on the right, a new 110

so the 109 seems to be the right one, although it appears smaller than the original, i figure the original looks like that from being stretched from years on the breach


Attachments:
seal 1.JPG
seal 1.JPG [ 468.11 KiB | Viewed 698 times ]
File comment: all shots taken at 82 feet
target.GIF
target.GIF [ 476.11 KiB | Viewed 698 times ]

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PostPosted: Mon Sep 30, 2013 10:25 am 
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Joined: Mon Jun 24, 2013 6:54 pm
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Some folks use a shim too.
http://www.archerairguns.info/2012/06/a ... -your.html


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PostPosted: Mon Sep 30, 2013 10:38 am 
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Location: Fredericton, NB
yup. i'm currently using a shim i made out of plastic, taken from an ice cream container, it does make a difference

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PostPosted: Mon Sep 30, 2013 11:55 am 
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Location: Saint John NB
Try using a Quad seal instead of an o-ring

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PostPosted: Mon Sep 30, 2013 2:07 pm 
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Location: Fredericton, NB
educate me, what is a quad seal

the O ring i installed this AM is already showing signs of wear, so i just sanded down the shim a bit as i'm thinking the seal is too tight when i close the barrel, therefore squashing it

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PostPosted: Mon Sep 30, 2013 3:25 pm 
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Location: Saint John NB
Quad seals are just a different type of o-ring.......they have flat edges that will seat better than an o-ring

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PostPosted: Mon Sep 30, 2013 3:29 pm 
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BTW if there are any hydraulic shops near,you pay them a visit. They are the best sources for seals designed to take pressure. Try not to use plumbing seals.

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PostPosted: Mon Sep 30, 2013 4:13 pm 
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got back from the hydraulic shop and got some quad seals, i can see how they would seal a little bit better by conforming to its groove, before i try those, i filed down the shim i had so the O ring wouldn't protrude so much, shot 50 pellets, seems to be holding now, but further shooting will tell

thx for the tip

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PostPosted: Wed Oct 02, 2013 6:25 am 
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After reading this post and seeing the pic of your target I took a close look at the breach seal on the TR77 that I have had no luck with. The seal protrudes a bit and is squashed over. I am now wondering if this why my targets look like yours. Do I have to order a Crosman seal or can I also find one off the shelf? I guess what I am asking is, is there a part number I can use to find one or should I just place an order through S&A?


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PostPosted: Wed Oct 02, 2013 7:03 am 
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you might have better luck finding a seal for yours since its under Crosman, the Ruger was something else...

i replaced the seal because the original wasn't protruding enough for my taste, but it wasn't damaged, i damaged it while removing it, i brought it to an hydraulic place where they measured inside and outside diameters, as well as thickness, they had every seal you could possibly need, i purchased 5 for about 3 dollars, good thing i did, it was quite the adventure getting it shimmed enough to seal but not damage the O ring, took about 3 tries to get the perfect shim

not sure how old your TR77 is or how much lead you put thru it, but replacing a squashed seal is certainly indicated, your local hydraulic place is a sure bet, and as i indicated above, sizing the right one might be a little challenging since the one you have might be stretched from being on the breech, so i suggest bringing the seal with you

O rings are numbered something like 108, 109, 110, etc

that info is probably available on a google search

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