I just dug the ol' expresso machine out of the back of the cabinet after a couple of years since it's been used; dusted it off, filled it with water and tried to use it. The heater works, the pump works, but no water comes out. t's plugged up with scale somewhere.
I put a pint of water and a 1/2 tsp of citric acid in it and let it sit for a while and tried it again. No joy. I took the screen off and it was clear. I notices a stainless steel bolt (looks like a big carburator jet) in the middle under the screen. I unscrwed it with a
13mm wrench and it is obviously plugged up. I turned on the pump with this jet removed and it works.I have the jet (online parts store calls it a boiler valve) soaking in some vinegar, but I don't know if that'll do it. The valve looks like it would come apart with two 13mm wrenches.
Is this something that will clean out OK if I just give it time in the vinegar (or citric acid)? Will I ruin it if I take it apart? Will I ruin it if I use something stronger, like hydrochloric acid (diluted
50%)? I also have phosphoric acid, which is safer for stainless steel, but I dunno if it will remove calcium scale.Worst case is I have to buy a new valve for $20 plus shipping. Wha'd'ya think?
Thanks, Bob