birdsallpl Posted July 5, 2014 Report Share Posted July 5, 2014 Just recharged my HW100 cylinder to 200bar, slight leak on cylinder / action when screwed back on. Shot two pellets, air still at 190 + bar when 3 rd pellet stayed in Barrel. Cylinder still well in the green. It seams a co-incidents that have slight leak and then failed to shoot, but as I said pressure still well up in cylinder. Any ideas what the fault could be? Quote Link to comment Share on other sites More sharing options...
evo Posted July 5, 2014 Report Share Posted July 5, 2014 no,,,,,this cannot be true,,,,,,,a HW 100 with a problem,,,,,,,,,,,,don't tell the daystate crew :lol: on a seriouse note, it may have been an out of shape pellet , is the pellet still in the cylinder seems strange if the rifle is fully charged, get a chrono on it as it could be a seal problem atb Evo Quote Link to comment Share on other sites More sharing options...
birdsallpl Posted July 5, 2014 Author Report Share Posted July 5, 2014 Pellet removed from barrel by removing magazine, moderator and rodding back. Quote Link to comment Share on other sites More sharing options...
evo Posted July 5, 2014 Report Share Posted July 5, 2014 have you put a few more pellets through and has it happened again I would certainly get the leak sorted mate as it will defo affect the performance of the rifle and they are normally built like tanks atb Evo Quote Link to comment Share on other sites More sharing options...
birdsallpl Posted July 5, 2014 Author Report Share Posted July 5, 2014 Going to try again today Quote Link to comment Share on other sites More sharing options...
evo Posted July 5, 2014 Report Share Posted July 5, 2014 (edited) first thing to check is , has it held its pressure, if not then you may have a serious leak and it will need sorting I had the same sort of thing happen to me on an AAs410, I put it in for a full service and touch wood it has not happened since good luck with it atb Evo Edited July 5, 2014 by evo Quote Link to comment Share on other sites More sharing options...
firdom Posted July 5, 2014 Report Share Posted July 5, 2014 My guess is the cylinder seal same thing happens if the cylinder is not screwed on tight enough Quote Link to comment Share on other sites More sharing options...
birdsallpl Posted July 5, 2014 Author Report Share Posted July 5, 2014 My guess is the cylinder seal same thing happens if the cylinder is not screwed on tight enough Thanks firdom, but do you think that would affect the power to the barrel even if the cylinder was fully charged Quote Link to comment Share on other sites More sharing options...
turbo33 Posted July 5, 2014 Report Share Posted July 5, 2014 Have you or anyone done anything to it recently, service etc? Quote Link to comment Share on other sites More sharing options...
firdom Posted July 5, 2014 Report Share Posted July 5, 2014 (edited) yes as i think you will find air is only released to the barrel/valve when you load cylinder so if the o ring is leaking it will not get full charge the o ring is a common fault when filling involves constant removal of cylinder there is now a different o ring i think made of polypropylene or something that lasts much longer Edited July 5, 2014 by firdom Quote Link to comment Share on other sites More sharing options...
birdsallpl Posted July 5, 2014 Author Report Share Posted July 5, 2014 Have you or anyone done anything to it recently, service etc? No, only recharged the cylinder. I have put a new scope on it and was going to zero when it packed up. Quote Link to comment Share on other sites More sharing options...
birdsallpl Posted July 5, 2014 Author Report Share Posted July 5, 2014 yes as i think you will find air is only released to the barrel/valve when you load cylinder o ring is a common fault when filling involves constant removal of cylinder there is now a different o ring i think made of polypropylene or something that lasts much longer I see what you mean but the cylinder was still well in the green showing almost fully charged. Quote Link to comment Share on other sites More sharing options...
firdom Posted July 5, 2014 Report Share Posted July 5, 2014 yes but when you cycle the new pellet in it only allows the correct amount of air to the valve with a faulty o ring half the air will be lost leaking past the o ring hence you have not enough air in the barrel to give full power Quote Link to comment Share on other sites More sharing options...
evo Posted July 5, 2014 Report Share Posted July 5, 2014 yes but when you cycle the new pellet in it only allows the correct amount of air to the valve with a faulty o ring half the air will be lost leaking past the o ring hence you have not enough air in the barrel to give full power reason for me telling him to chrono the gun in #2 it will usually 9/10 times find a fault,,well where pressure and power is concerned atb Evo Quote Link to comment Share on other sites More sharing options...
turbo33 Posted July 5, 2014 Report Share Posted July 5, 2014 (edited) Take the cylinder back off and see if the valve is leaking. If it is, give the valve a depress with something to try and blow any crud out of it, and also check the tiny o ring on the valve itself. It could also be the culprit is the regulator piston o ring. Its pretty much the only o ring that does any work. Easy enough to get at and do if your competent, but a bit long winded and needs the power setting up again once done. Have done two on my HW100 in six years Edited July 5, 2014 by turbo33 Quote Link to comment Share on other sites More sharing options...
firdom Posted July 5, 2014 Report Share Posted July 5, 2014 Weihrauch HW100 PCP Air Rifle Cylinder Sealing O-Ring The HW100 series are regarded as excellent quality Precharge Air Rifles. To maintain their levels of performance and accuracy the Cylinder Sealing O-Ring is constantly in use when charging, or firing the rifle. It is recommended to change this Sealing O-Ring at the first sign of any leaks, splits or when carrying out any work on the rifle cylinder. The seal itself sits on the main valve inside the action and is visible when the cylinder is removed from the rifle. The same Sealing O-Ring is used on the brass filling adapter supplied with the gun that the bottle screws into when charging and is NOT designed to be used on the Probe. Also referred to as part number OR044 Quote Link to comment Share on other sites More sharing options...
birdsallpl Posted July 19, 2014 Author Report Share Posted July 19, 2014 Firdom. I can see the small o ring, but how do you replace it? It's a bit tight for my digits to get to. Do I have to split the gun down? ' The seal itself sits on the main valve inside the action and is visible when the cylinder is removed from the rifle.' Quote Link to comment Share on other sites More sharing options...
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