Grandpa wrote:
> zxcvbob wrote:
>
>> 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
>
> I think that's the check valve aka 3-way valve, and you will most likely
> have to carefully take it apart. There's a ball and spring arrangement
> inside so be careful and take note how its arranged. Clean the orifice
> and then reassemble. Unless you take it apart, the cleaning solution
> will take a really long time to get that orifice clean since its blocked
> on one side by the ball and spring.
> HTH - Love my Gaggia
>


Thanks. I did take it apart; I felt the spring in there as I was
loosening it, so I was careful not to let it fly apart. I had used a
needle to poke the hole that was completely blocked before I took it
apart when I was trying to just soak it clean.

I soaked the taken-apart valve in vinegar for a while, then used a Q-tip
with some phosphoric acid to clean the inside where the check ball
seats. Rinsed it, put it back together, and ran some fresh water thru
the machine.

It's working just fine now. :-) It's kind of odd that the holes don't
line up between the 2 halves of the valve and the water has to travel a
little ways through the screw threads. The water doesn't seem to mind.

Best regards,
Bob