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Advice HW 100 Air Leak

Discussion in 'Anything Airgun Related' started by DaveC_24, Dec 16, 2013.

  1. DaveC_24

    DaveC_24 Busy Member

    Messages:
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    Location:
    Redruth, Cornwall
    I've got an HW100 here which has a slow air leak, bleeding down visibly on the gauge over a period of several hours/overnight. It shoots very consistently (8fps variation over 10 shots) and at a decent power (11.7 ft.lb), so it works fine when there's air in it. The leak only occurs when the bottle is in the rifle - the bottle itself holds the fill fine.

    This is the first time I've had a leak on a PCP which isn't obvious where it was from, so I'd appreciate you folks' help! I was thinking of trying the balloon over the muzzle trick (with moderator removed) - do I need to leave the rifle cocked or un-cocked for that, and is there something else I should be trying first?

    Thanks in advance! :)
     
  2. walker

    walker Busy Member

    Messages:
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    Location:
    Wolverhampton
    screw the cylinder off mate look inside the action and you will see the small o ring. chances are its just that o-ring that needs replacing. I had the same problem on my hw100. all I did was remove the cylinder and clean out a lot of gunk that had collected around the o ring. job done.
    that would explain why it doesn't leak when the cylinder Is removed.

    hope that helps you mate:)
     
  3. DaveC_24

    DaveC_24 Busy Member

    Messages:
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    Location:
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    Cheers walker, I see the O-ring you mean, around that little nub in the middle of where the cylinder screws in. I'll get the action out of the stock and give it a good clean up with a cotton bud and some IPA and see if that sorts it! :)
     
  4. walker

    walker Busy Member

    Messages:
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    Location:
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    Let me know how you get on mate.
    you might need to replace the
    o ring with a new one
     
  5. Seanalf

    Seanalf Engaging Member

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    Location:
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    If you need an o ring, let me know your address and I'll pop a spare in the post. They're £3.50 each from some robbing gits on the 'bay, I've got a couple of spares and you can have one for nowt if you need.
     
  6. critter

    critter Donator

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    Location:
    chesterfield
    Nice gesture Seanalf for a FOC oring, There are some great people on this forum! I would also agree with you that the tiny oring is the problem.
     
  7. DaveC_24

    DaveC_24 Busy Member

    Messages:
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    Location:
    Redruth, Cornwall
    Thanks Sean, that's a very generous offer! I'll post an update tomorrow, when I see if it's leaking still having cleaned the O-ring and surrounding area...
     
  8. DaveC_24

    DaveC_24 Busy Member

    Messages:
    988
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    Location:
    Redruth, Cornwall
    Well, having cleaned that o-ring up and put the air cylinder back in, it doesn't seme to have lost any air overnight, so I'll see what it does over a few days. That said, before I did anything to it, it bled down to the yellow arc from around 3/4 of a fill, so it may well be the case that this is sorted. Thanks for your help! :)
     
  9. walker

    walker Busy Member

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    Location:
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    fingers crossed matey!
     
  10. Seanalf

    Seanalf Engaging Member

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    Location:
    Abertillery
    Not a problem, I also have a spare .177 bolt probe seal and the 12x1 replacement seal that goes on the breech face if you need to remove it.Always happy to help where I can
     

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