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Advice wolverine .303 depressured

Discussion in 'Anything Airgun Related' started by arcmonty, Apr 7, 2014.

  1. arcmonty

    arcmonty Newbie

    Messages:
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    Location:
    Surat, Gujarat, India
    Hello,
    I am form Indian and have recently purchased Daystate Wolverine .303 PCP air rifle. When i got the gun's delivery the pressure was almost full and i kept it for a week, then i fired 15 shots in between i had ordered my scuba tank for refilling which took about 4 days to come. After firing that 15 shots the pressure was showing between yellow and red mark. 4 days later when i got my scuba tank i was setting it for the refilling but when i saw the gauge it was showing completely down even though i tried to fill the pressure but all pressure was coming out the main barrel and was not filling the tank. please anyone can help me out of this?
     
  2. bunny basher

    bunny basher Engaging Member

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    Location:
    Tewkesbury
    hi mate try cocking the gun before you try and fill it some times this helps
     
  3. simonc_here

    simonc_here Engaging Member

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    Location:
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    12-15 shots is about all you get from the .303 wolverine. So it looks like you went below the pressure required to keep the valve closed against the hammer spring pressure.
    As bunny basher says, cock the rifle before filling and give it a blast of air to get it started and then fill the rest of the way slowly as normal.
     
  4. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    Location:
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    So the issue here, as I understand it is that the gun held pressure perfectly when it was full of air, but after some use it now leaks when the reservoir has less air in it?

    It sounds like a dodgy seal somewhere (probably a valve); which seals with high pressure in the cylinder, but leaks once the gun's been used and cylinder pressure is reduced. Now all the air in the cylinder has evacuated and the valve is stuck open, causing air to escape down the barrel when you try to fill the gun.

    In the short term do as others have suggested and cock the rifle before filling; giving it a short sharp blast of air from the bottle to try and get the valve seated. You may want to only fill to a low pressure (say 100bar) and check for leaks by putting a drop of oil in the suspect areas - my guesses would be the inlet valve (both the valve itself and its sealing washer) or the exhaust valve (open the bolt, shine a torch into the breech so that you can see the transfer port, run some oil in so that the port is submerged) if putting oil on any port / seal is greeted by bubbling, there's your leak.

    If you do have a leak at low pressure you have two options; firstly ensure that the rifle is always full and continue using it, or secondly send it back to where it came from and get them to sort it under warranty. Personally given the cost of the rifle and the potential for the problem only to get worse, I'd want it fixing.

    Good luck getting it sorted ;)
     
  5. Accuspell

    Accuspell Pro Poster

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    Location:
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    This is because of the power being produced. The valve is held shut by the pressure in the reservoir - the valve spring merely lifts the valve into the seat. In the same way the valves in an engine are actually sealed by the compression of the piston.

    When the pressure reaches a critically low point the strength of the hammer spring is greater than the strength of the valve spring. It is how it has to be to produce the power it does. Simply make sure you keep the pressure above that critical point - on my high powered Rapid, which is also regulated, when the pressure reaches that critical point the air literally dumps, through the reason above - the hammer is held against the valve stem harder than the valve is held against the seat, so the air escapes. Provided I keep more air pressure in the reservoir than the hammer spring can overcome it holds air for months.

    I suggest with your Wolverine, simply keep it topped up every 12 shots (because you know it still holds air after 12). You might get away with doing it every 15 shots, only you can find that out. If you get the air dump, simply cock the rifle to take the weight of the hammer off the valve, then it will fill as normal because the valve will having nothing working against it. If you don't cock the rifle, the strength of the hammer spring is holding the valve open slightly while you are trying to put air in the other side, and it simply leaks through the gap. It is not a problem, it is just how it is.

    One of the dangers, especially in a dry climate with dust, is taking the pressure too low can allow a piece of dust into the system and that could create a leak on the valve seal - make sure you keep the air clean, and don't allow the chance of dust to get into the valve/hammer system. That is why I suggest you err on the safe side and keep it topped up at 12 shots, rather than risk the other 3.
     

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