Stewart Posted February 21, 2011 Report Share Posted February 21, 2011 Can anyone give me any advice on how to change the leather piston seal on a Mk.1 airsporter? The piston has a conical nose and I'm damned if I can see how to get the old seal off. Quote Link to comment Share on other sites More sharing options...
pigeonstool Posted February 21, 2011 Report Share Posted February 21, 2011 http://www.gunspares.co.uk/shopdisplaycategories.asp?id=24287&cat=Airsporter have a look here Quote Link to comment Share on other sites More sharing options...
hyflier Posted February 22, 2011 Report Share Posted February 22, 2011 (edited) The piston rod unscrews Stewart. I found it easier when I cut the old washer away first. Clamp the piston in a vice with soft jaws, or use some wood to protect the metal. I tried to edit this earlier, but failed miserably You will also need a tool to undo the retaining nut which is inside the piston, I think John Knibbs sells them but you can make one yourself using a tubular bar and leave two lugs on one end. Edited February 22, 2011 by hyflier Quote Link to comment Share on other sites More sharing options...
Stewart Posted February 23, 2011 Author Report Share Posted February 23, 2011 Hi hyflier, Thanks for taking the time to reply but I've had a good look at the piston and there's definately no sign of any nut inside the piston or grooves for a suitable tool. There is a loose washer inside it which the spring sits on but there's no sign of anything under it either and I have looked very carefully. Still puzzled. Quote Link to comment Share on other sites More sharing options...
Stewart Posted February 23, 2011 Author Report Share Posted February 23, 2011 Thanks pigeonstool. Quite a good site with diagrams but no ezplanation as to how to get it off. They say it's difficult and will change it for me if I send them the piston. Quote Link to comment Share on other sites More sharing options...
hyflier Posted February 24, 2011 Report Share Posted February 24, 2011 Take out the washer and using a torch, look from the back of the piston rod down inside the piston. You should be able to see (ok I called it a nut) another washer with two slots in it. This is what you need to unscrew in order to dismantle the piston assembly. Quote Link to comment Share on other sites More sharing options...
Stewart Posted February 24, 2011 Author Report Share Posted February 24, 2011 Hi again hyflier. Have double checked with the washer out and there's definately no slots to be seen. Have now lost the plot and ripped out the old washer with a pair of pliers. This allows the conical part in front of the leather seal to move but I still can't fathom out how to replace it with the new one. Now being an engineer by trade, this is getting embarrassing. Quote Link to comment Share on other sites More sharing options...
hyflier Posted February 25, 2011 Report Share Posted February 25, 2011 Ha ha, brilliant.......... I know how you feel Phone John or Mark Knibbs at the country store on 01675 481006 these people are BSA experts and will be able to describe exactly what you need to do Good luck, you'll get there in the end Quote Link to comment Share on other sites More sharing options...
Stewart Posted February 26, 2011 Author Report Share Posted February 26, 2011 Many thanks hyflier. I'll give them a go. Quote Link to comment Share on other sites More sharing options...
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