Up to this point, I'd looked fairly carefully at the steam end but ignored the water end of the pump assuming it would 'just work'. I should have known better; it's always the assumed bits (that make an 'ass' out of 'u' and 'me') that don't work.
I began with the section drawing.
|WS BFP Pump Section|
Even though I'd previously suspected the piston rings, the fact that I could easily blow through would not be affected by the piston rings. Therefore it had to be the valves so I took them apart one by one. Fortunately, a large hex key worked well to undo them all.
|Hex key removing the valves|
(with a little help from me when needed but it sat there just nicely for the photo!)
|Top view (water is pumped up from below the valves)|
|View of valve seats from underneath|
|One of the offending pieces of matchstick...|
|... and where it was not very usefully lodged!|
|No socks-appeal here!|
As well as the view from the water end, there is also a very subtle acoustic difference to before in that there is a feint 'raspberry' in time with the pump strokes. But as with deep-seated raspberries, you'll probably need a good subwoofer with your speakers to hear it!
Just to complete the picture, some photos follow of other WS bits and pieces.
|Broken spring, later suitably 'bent' into shape and stretched to fit.|