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Bsa Hornet - Filling Issue

Discussion in 'Technical' started by UrbanYeti, Mar 25, 2020.

  1. UrbanYeti

    UrbanYeti Member

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    I have a BSA Hornet that has been sat out of use for (quite possibly) a few years.
    Dusted her off today and I'm having issues filling her up.

    I have a bottle of diving 'breathing air' hooked up, via the bottles gauge and cable, to a BSA filling probe.
    The filling probe looks in good shape, as I don't think it was ever used more than 2-3 times.


    When i begin to slowly release the gas from the bottle, it is audibly hissing out from near the back of the probe/cable.


    I've been reading forum posts about this kind of thing and saw suggestions to keep the rifle cocked whilst charging.
    It had a meaty sounding dry-fire after charging, and I felt resistance when re-cocking, but no cigar when shooting a pellet.
    It just slides half way down the barrel.

    Any ideas on common failure points?
     
  2. sagalout

    sagalout What a plinker!

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    Can you put up a picture of where the air is "hissing"? If it's from around the probe area then either the probe is not sealed to the whip or the seals are knackered on the probe.

    Have you just put the probe on the whip? Did you use a dowty washer?

    From what you have described it is not the gun, although once you get air into it it may well have leaks as well, rubber and time are not good mates.
     
    UrbanYeti likes this.
  3. g1nga

    g1nga Well-Known Member

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    and that's how you get a 3rd child :facepalm: :)

    :focus:
     
    Howlin Wolf, UrbanYeti and sagalout like this.
  4. sagalout

    sagalout What a plinker!

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    I nearly wrote that with my OP but I thought I would leave it so some other childish mind like mine could have the pleasure :D
     
    Howlin Wolf likes this.
  5. g1nga

    g1nga Well-Known Member

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    I'm glad to fill your low expectations :)
     
    sagalout likes this.
  6. UrbanYeti

    UrbanYeti Member

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    Thank you for the response, just had chance to get images.

    The largest force of air can be felt with my hand, on the hose side of the large silver nut.
    It seems to have a smaller amount of air coming out of the probe end of that silver nut.

    they are metal on metal cone connections, and so should be fine.
    some metal tarnish but no physical chunks missing.

     
  7. sagalout

    sagalout What a plinker!

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    Logic suggest the cones aren't sealing. Tighten it up a bot more?
     
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  8. UrbanYeti

    UrbanYeti Member

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    I got the adjustable spanners out and it no longer leaks!!
    Thank you!:up:

    However, it shows it gets up to a pressure of 150 bar, and doesn't change.

    Potentially the bottle is under pressured and unable to charge above that?
    I don't have a seperate valve to test the pressure of the bottle, as the pressure gauge only shows the pressure in the hose.

    In addition, it still doesn't fire.

    After corona, I may have to take the rifle to a shop or something; and have it charged with equipment known to be working :(
     
  9. sagalout

    sagalout What a plinker!

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    I will take a wild stab in the dark and say your dive (to distinguish it from the rifle) cylinder is at 150 bar. The normal way to monitor the dive cylinder is to put a blanking plug in the end of the whip instead of the fill probe. One of these kits allows you to instantly change from fill probe to blanking plug and also to change fill probes. The best fittings starter pack is cheaper from here
     
    Howlin Wolf likes this.
  10. UrbanYeti

    UrbanYeti Member

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    Do we think 150bar would be too low to get past the valve on the rifles inlet?
    Is low pressure (150/230 bar) enough to make the rifle leave a pellet in the barrel?

    I ask as I'm trying to rule out a fault with the rifle its self.
    + I'm worried that its still failing to function at all, not just an underpowered shot.

    Having a useless dive cylinder is preferable over other possibilities :D
     
  11. sagalout

    sagalout What a plinker!

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    150 bar is ample to fire a pellet. Is there a pellet in the barrel? If there is remove it, With no pellet in the gun, fire it. Does it go BANG?
     
  12. g1nga

    g1nga Well-Known Member

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    What do you mean by doesn't fire? If you put a piece of cloth in front of the barrel does it move when the gun is fired?
     
  13. UrbanYeti

    UrbanYeti Member

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    The first time after a charge attempt, yes, seemingly BANG-ing.
    But now it's kind of just a light click.
     
  14. sagalout

    sagalout What a plinker!

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    I assume the click is the trigger sears releasing the hammer, can you not hear the hammer strike?

    Looking at your pictures I can see it is an MMC, I know very little about them, but I think the front push knob is the indexing action and the rear pull knob is the cocking bolt.

    On an Ultra SE you can look in the empty magazine slot and see the hammer position, normally uncocked it will be resting against the firing pin, and cocked there will be a significant gap between the hammer pin and the firing pin.

    Can you cock the gun, charge it with air (if the bottle gauge is registering 200 bar or less leave it connected and open) and fire the gun (NO PELLET), cock and fire, cock and fire. What happens? BANG or click, can you see the hammer move?
     
  15. rkr

    rkr Posting Addict

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    It's the regulator. Fix it or ditch it and retune the gun as unregulated. You can also turn the airtube around and install a Huma regulator.
     
    sagalout and Howlin Wolf like this.

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