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BSA Hornet knockoff valve

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Pauly5 View Drop Down
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    Posted: 16 Sep 2020 at 8:41pm
I have an older BSA hornet pcp. The one with the micro cocking mechanism. The valve stem sealing end has worn, causing a leak, so I made a new one out of delrin. It has reduced the leak, and I wonder if I didn't get the seat angle right. Does anyone know what the angle is by any chance? I know it's a long shot. Mike it will be the same as in the lonestar, but I don't expect you to strip your gun to look.

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dvlnme View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dvlnme Quote  Post ReplyReply Direct Link To This Post Posted: 17 Sep 2020 at 7:27am
i have a slow leak in my bsa sportsman so got pull it down soon mate,valve same as lonestar and hornet,and prob leaking at valve to,as have replaced all the seals,its got be valve seat now have cheched and replaced everything else,how much of a hurry you in??could be couple weeks til i get around to it.
 cheers mike 
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Pauly5 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 17 Sep 2020 at 8:13am
No Rush, I just work on it when I get to it. Once the tank is empty, it screws off the valve body, unscrew the brass stem retaining cap and the valve stem comes out. Takes about 2 minutes fortunately.
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dvlnme View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dvlnme Quote  Post ReplyReply Direct Link To This Post Posted: 18 Sep 2020 at 6:47am
BSA guns are all well designed and easy to take down,have both mine apart several times now,fiddliest part getting the little bolt lock out and back in,its a fiddly bloody thing eh!!maybe just my sausage like fingers eh!!dont know when will get to taking rifle down mate but got be soon summer hunting coming up
 will need rifle by then,will try get at it next week once weather warms up again gets bit chilly in workshop this time of year.
 cheers mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Sep 2020 at 7:18am
I took it out last night and used a new, sharp box cutter blade to carefully scrape the edge of the delrin. It seems to have made an improvement so far. Makes sense that any small fillament could cause a leak on the sealing edge.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dvlnme Quote  Post ReplyReply Direct Link To This Post Posted: 19 Sep 2020 at 7:28am
dosnt take much to break the seal on a valve,the tiniest bit dirt will do it and if that dirt becomes embeded in the poppet seat the leak will slowly get worse over time as the embeded dirt will damage the actual metal valve seat as well,i have found tiny bits of metal embeded in poppets that some how got left in valve when gun was made,in one case this completly destroyed metal valve seat beyond repair,this metal had to have come from some where and as only brass used in gun was the valve i believe it had some how been left in valve during manufacture as it turned out to be tiny piece of machining swaf.gun involved was a maurder rifle so can happen eh.
 sounds like you may need new poppet mate,give Ron a call he proberly got one mate.
 cheers mike
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