Impact regulator woes rant

Forums PCP Airguns Impact regulator woes rant

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    biohazardman
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    heavy-impact

    biohazardman

    Gun is a gen2 not an x but just before.

    I don't know about leaks at other pressures I'm only at 140-145bar at the moment.

    Sounds like the big end of the piston is at the top of it's bore in the receiver. This lets the oring on the big end of the piston push out and leak out the weep hole. The oring is probably not damaged.

    The solution is to add 1 more washer with the curve in the same direction as the one before it (an FX one will work). This makes the big end of the piston ride deeper in it's bore. Then with a knife or scribe, make a scratch from the little hole on the small end of the piston up to the end. This prevents the internal oring from blocking the hole when you first pressurize the gun. The scratch won't affect anything else.

     

     

     

    biohazardman said

    In my reading the literature on the Huma I found where it said one could put a set of FX bellville washers to add to the stock ones to increase reg pressure on the gen one Impact.  So, I did that on the gen2.  It werqed fine for a number of months I ran it at 150-160 bar but after the plenum install I turned the reg back down to 140-145.  I am a good thread and a half  probly more from the adjustment screw being level with the block so should be good.   The leak is recent but I don't want to tear into it until I have the parts to fix it.  I was hoping to have the FX parts to replace the Huma if I found I did not have the correct 0-rings.  That did not werq out so well.  So, it can leak for awhile 10-20bar in several hours, till I get parts.  That's not enough to stop me from shooting.

    Thanks for all the help

     

     

     

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    biohazardman
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    FX sent me a second regulator rod at no cost as it should have been and it is a beautifully machined little piece of plastic that will make my gun werq again.  Good for FX.  Sometimes it's the small things that matter. 

     

                  First replacement I purchased from FX.                             Original on the gun never was quite right. Damage to

                                                                                                                    the top was self inflected.  Notch on the side

                                                                                                                    was the problem

     

        Second replacement is a good one.

     

     

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    bucketboy
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    There are a couple of things I notice.

    firstly, the o ring in the photo looks to be of particularly bad quality, the seem running down the middle should be almost undetectable. Those little pieces of rubber flashing can’t help with creating a perfect seal.

    other than cost, why on earth would you make the entire piston out of delrin? Yes it seals well but is is too elastic to give a consistent force onto the sealing face. When the reg in my impact starts to creep or leak or both, (it almost certainly will) I shall replace it with one made from brass that has a delrin sealing face.

     

    For what it’s worth, I always de-burr the belville washers when I build a reg, two reasons, it’s stops them scratching up the shaft of the reg core and it allows the washer s to stack more evenly. I can’t prove this helps but I am absolutely positive it doesn’t make things worse.

     

    Bb

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    biohazardman
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    Found my leak was actually the tank pressure gauge the leak at the weep hole quit a while after adding another washer to the reg so I could turn the pressure up a bit.  The tank pressure gauge was the real permanent slow leak and it needed to be tightened near 1/2 turn before the leak stopped.  Yes the o-ring is ugly for sure.

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