mk4 is leak

Discussion in 'General Airgun Chat' started by pete53, Dec 2, 2010.

  1. pete53

    pete53 New Member

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    mk4 is leaking

    Filled up to 220 on Sunday now at 190. Tried a balloon on the filler valve no leak there. Is there anything else I can try before sending back for the 4th time in 6 mths. Does it effect the fps consistency of the gun.
    Thanks Pete
     
    Last edited: Dec 2, 2010
  2. chrispro97

    chrispro97 New Member

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    tried the barrel end with a ballon on that if not sounds internal but shouldnt alter fps second its a very slow leak,dont go on the gauge of your gun they r not very accurate
     
    Last edited: Dec 2, 2010
  3. Charlts

    Charlts Getting dusty

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    Sounds daft but did you fill it in the warm and then check it in the cold? Try filling in the warm and then checking the next day in the warm, you'll probably drop about 10bar as the air cools in the cylinder then it'll remain constant. That's what mine does anyway, I dropped about 25 bar going outside last weekend.
     
  4. peadar_911

    peadar_911 Too old to die young.

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    Hi Pete

    Mine developed a small leak on the actual cylinder end during the summer. I only found the leak by dousing the cylinder and action in soapy water. I had to bleed the system down, remove the end of the cylinder (the bit the filler valve screws into) clean and recoat the "O" rings with silicon grease and reassemble. This isn't a job that everyone would be happy to tackle, and it may not not even be the problem on your rifle.

    I have also removed the AT, so was able to strip the gun completely, ensuring that no water was left where it shouldn't be.;)

    Peter

    PS It wont affect your MV unless the pressure drops below what you normally shoot at.
     
  5. pete53

    pete53 New Member

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    Just to be sure I have refilled to 226bar removed the shroud and fitted a balloon to the barrel and filler valve
     
  6. pete53

    pete53 New Member

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    It looks like a return to the factory after Xmas
    fill time
    226.4 15.20
    223.7 18.00
    223.7 19.45
    222.5 22.00
    220.8 02.00
    218.1 08.00
    217.3 13.30
    216.4 15.30

    balloon on barrel and fill valve no change
     
    Last edited: Dec 3, 2010
  7. JAGXKRS

    JAGXKRS Sparky's Bodyguard

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    Pete if its only dropping 10bar 24hrs after a fill I would not worry about it all of mine have done that, if it keeps losing pressure over the next 48 hrs then you have a leak;)
     
  8. pete53

    pete53 New Member

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    Bit peeved at no shooting this weekend so took another look at the leak now down to 110. Put some washing up liquid around the barrel ring area as Pete suggested and low and behold tiny bubbles. Have stripped it down for a clean, fingers crossed. Thanks for your help Pete.
    Pete
     
  9. relivingmyyouth

    relivingmyyouth New Member

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    Shudda stuck with the 510 Pete !!!!
     
  10. pete53

    pete53 New Member

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    Interesting update
    Leak fixed filled to 155 and monitored for 15 hrs and lost 11 bar, thought I had another problem after emptying cylinder.
    Dry fired 2 shots and in 6 hours pressure stayed the same.
    Filled to 218 and again lost 4 bar in 2.5 hrs, dry fired a shot and again no loss in 2 hours.
    Don't know if this is a feature of Daystate but at least problem solved
     

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