wildcat breach o-ring

Forums PCP Airguns wildcat breach o-ring

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    Kitplanenut
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    My 22 wildcat goes thru a breach seal o-ring every 2500 shots like clock work. Just went thru my 3rd one. I’m tired of looking for the size, so I’ll just ask. I think it is 5.28×1.78 but not sure. There is a big hydraulic and air cylinder place not far away so was going to check with them and see if they had it in different materials to try. Maybe this is where I should go into a rant about FX. Just kidding. Couldn’t be happier with them and this gun this gun.

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    AirgunBill
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    The o-ring you want is listed as FX’s part #5112. I got 100 N70009 Buna -N 70 off of Amazon for a little over $2. It says right on the package they are the equivalent of 1.78 mm to 5.28 mm. Bill

    http://www.amazon.com/009-Buna-N-Ring-Durometer-Black/dp/B000FMYOG4/ref=pd_sim_328_6?ie=UTF8&dpID=41BTaje6hCL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=0YXV112D325H6RBR585R 

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    Kitplanenut
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    Thanks airgun. They are on their way. I’ll be good for half million shots!

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    AZBOBCAT
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    Use polyurethane orings they last longer as they are more abrasion resistant, pennies more expensive but they last much longer.

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    MarkUK
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    While we’ve got a thread entitled WC breach o-ring, it would be good to have the sizes for the .177 and .25 barrel breach o-rings as well.

    OK, the O-rings are all listed in the assembly sheet here:
    Standard version:
    http://www.fxairguns.com/wp-content/uploads/2015/10/wild-exploded-drawing-Standard.pdf
    U.S. (AoA) version:
    http://www.fxairguns.com/wp-content/uploads/2015/10/wild-exploded-drawing-AoA.pdf
    The .177 (4.5mm) barrel takes 4,3×1,5 NBR 70 It is part 2529.
    The .22  (5.5mm) barrel takes 5,28×1,78 Pur 70 It is part 5108.
    The .25 (6.35mm) barrel takes 6,35×1,27 NBR70 It is part 4526.

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    mubhaur
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    My fx royale 400 blow breach O ring in just 60 to 90 shots. You are lucky that your work for 2500 shots.

    Always use 70 shore Polyurethane for best accuracy. The dimensions given on above replies are correct

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    AirgunBill
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    “MarkUK”While we’ve got a thread entitled WC breach o-ring, it would be good to have the sizes for the .177 and .25 barrel breach o-rings as well.

    The .22  (5.5mm) barrel takes 5,28×1,78 Pur 70 It is part 5108.

     

    
I’m sorry I did not see the Wildcat .22 cal. took the Pur 70 type of o-ring. my .25 cal. for whatever reason takes the Buna 70. Though if you got the Buna 70 in the 100 pack I guess you can just replace them a little more often. Here is the correct size and type at the O-Ring Store.

    http://www.theoringstore.com/index.php?main_page=product_info&cPath=367_459_458&products_id=16200 

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    Wingman
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    My best guess is that you are using the wrong sized o rings. It is important to use metric o rings in guns made to fit metric sized o rings.
    All FX are metric.
    N70 5.5mm X 1.5mm or 6.0mm x 2.0mm are not the same as the imperial o ring 009 (5.78mm x 1.78) there is enough of a difference in some fitments to premiturly wear, dislodge or leak.

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    AirgunBill
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    “Wingman”My best guess is that you are using the wrong sized o rings. It is important to use metric o rings in guns made to fit metric sized o rings.
    All FX are metric.
    N70 5.5mm X 1.5mm or 6.0mm x 2.0mm are not the same as the imperial o ring 008 (5.78mm x 1.78) there is enough of a difference in some fitments to premiturly wear, dislodge or leak.

    
In all o-rings there are some tolerance allowances. And there may be as you say enough to make a difference in performance. They size equivalent was an 009 not 008 as you mentioned. I know I searched high and wide in the US to find the metric sizes listed in the FX parts list. I come to believe some must actually be AS568 spec. o-rings in reality but that is my theory. In the end if we can help each other out to find what we need at an reasonable price that is a good thing. Bill

    Here is the AS569 chart for comparison

    http://www.theoringstore.com/index.php?main_page=page_2&zenid=8599b515d12467a00fbc58db8d9b85bc

    Here is the N700009 orings I bought

     

    Here are some of the o-rings I bought from Amazon and the O Ring Store

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    Wingman
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    Sorry typo.. yes 009 not 008 i will correct op

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    Kitplanenut
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    Wow mubhaur, Replacing the o-ring every 60-90 shots would be a pain. Have you checked your pellet probe to make sure there isn’t a burr or a sharp edge. Run a dry Q-tip over it and see if it pulls any fibers off. They are not really hard to replace. Just aggravating trying to stuff the slick greasy bugger into the groove. Kind of like checking the prostate on a house cat. 

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    mubhaur
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    I have just inspected the probe by my finger. It appears to be ok. I shall try your suggested test. I think that the brass part groove is over sized a bit

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    GK1973
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    For Fx Royale400 use 5.28×1.78 NBR70

    And you will resolve problem

     

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    Yote
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    Buy these .Have not had one blow out in a long time

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    Oregun
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    Anyone find a good source for the 25 cal WC?  

    I found them … never mind

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    Locker50
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    For a $1000+ gun, if you have to do maintenance on it every 60-90 shots, whether it be a powder burner or air gun, there's a major manufacturer defect. 

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    Wizard
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    My Bobcat mk II in .25 has 40 tin's of JSB King through it an haven't had to change the breach O-ring. I clean and lub my pellets but i use silicone lub.

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    jking
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    Oregun

    Anyone find a good source for the 25 cal WC?  

    I found them … never mind

     

    Where did you find them? I ended up ordering a few from FXUSA. I found another web site but I can't recall the name of it. They had a $25 minimum order and just didn't need any more Orings than the ones for the WC 25.

    Jking

     

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    Oregun
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    jking

    Oregun

    Anyone find a good source for the 25 cal WC?  

    I found them … never mind

     

    Where did you find them? I ended up ordering a few from FXUSA. I found another web site but I can't recall the name of it. They had a $25 minimum order and just didn't need any more Orings than the ones for the WC 25.

    Jking

     

    O-ring store has both the Buna & Viton.  Buna's are $.14 and Viton $.39.  

    https://www.theoringstore.com/index.php?main_page=advanced_search_result&search_in_description=1&zenid=5e873fcb13b64b74f7041db70e9f3574&keyword=1.27mm+x+6.35

    I should have them by the end of next week.  Shoot me a PM with your address and I'll send you some.  I bought both.

    –Carl

    Oops…  I bought 1.78 instead of 1.27.  I'll search some more.

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