Question about Bialetti Mukka Express

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My mukka is shooting steam out of the small valve/washer thing on the bottom pot part. As it gets hots the valve pops up (but not with gusto like it used to do) and then I get a little coffee mixed in with the milk and steam shooting out the side valve. It seems like it is not building up enough pressure to push the coffee up into the top and there is no foam due to the steam loss about the side. Any ideas?

Posted by getshark on

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Anonymous

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The safety valve on the lower boiler chamber is there to release pressue in case too much prssure builds up in the pot when brewing. If youy have an 11 mm wrench you can take it out and clean it by pulling on the outsidepart, there is a little knob that may be grabbed by a tweezer, gently pull it out, it is spring tensioned, and run water in the opposite end, Chances are some coffee grounds particles got in it and it is not seating good. after cleaning put a few drops of olive oil in it , the inside part. Should seal better and still funtion as a safety valve. Or you can leave it in place in the pot and just pull on the outside , flush with water and then put a few drops of olive oil in it. While you are at it, put olive oul on the threads, olive oil film and the the rubber seal and add a little to the rubber button on the top valve.

Posted on Jul 10, 2011

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Ned C Cook

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There is a restriction and those valves are safeties to prevent excess steam pressure that can both injur and ruin the machine. If you can, chk all the passages for any blockage. and free movement of any valves. Good Luck,Ned-

Posted on Sep 16, 2009

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Koral Ilgun

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SOURCE: My mukka is shooting steam out of the small

I had the same problem and saw this solution in another bialetti mukka problem report, which made sense: "the safety valve on the lower boiler chamber is there to release pressue in case too much prssure builds up in the pot when brewing. If youy have an 11 mm wrench you can take it out and clean it by pulling on the outsidepart, there is a little knob that may be grabbed by a tweezer, gently pull it out, it is spring tensioned, and run water in the opposite end, Chances are some coffee grounds particles got in it and it is not seating good. after cleaning put a few drops of olive oil in it , the inside part. Should seal better and still funtion as a safety valve. Or you can leave it in place in the pot and just pull on the outside , flush with water and then put a few drops of olive oil in it. While you are at it, put olive oul on the threads, olive oil film and the the rubber seal and add a little to the rubber button on the top valve."

Posted on Aug 05, 2011

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I had the same problem and saw this solution in another bialetti mukka problem report, which made sense: "the safety valve on the lower boiler chamber is there to release pressue in case too much prssure builds up in the pot when brewing. If youy have an 11 mm wrench you can take it out and clean it by pulling on the outsidepart, there is a little knob that may be grabbed by a tweezer, gently pull it out, it is spring tensioned, and run water in the opposite end, Chances are some coffee grounds particles got in it and it is not seating good. after cleaning put a few drops of olive oil in it , the inside part. Should seal better and still funtion as a safety valve. Or you can leave it in place in the pot and just pull on the outside , flush with water and then put a few drops of olive oil in it. While you are at it, put olive oul on the threads, olive oil film and the the rubber seal and add a little to the rubber button on the top valve."
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