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  • #31
    Originally posted by MorganGT View Post
    We have a large industrial ultrasonic cleaning bath in our workshop using a specialist descale solution, and even it won't clean a boiler better than you have managed there, so I'd probably score it above 98%!
    Wow! I guess that confirms what my wife labels as a serious case of OCD has paid off (for me, she isn’t so impressed with the many hours I have put into this machine)!

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    • #32
      Hey, you are doing a great job there. I have 1 group Boema I'm also restoring. Was in similar condition to yours. I've used activated descaler on the boiler, took an entire 500g container and multiple attempts to get it clean but finally all done. Mine has a boiler with no removable end, must be a slightly different model.

      Am also replacing the element, anti vac valve, 3 way solenoid and the water/steam valve shafts.

      Re the steam wand tip, the guys from Boema sent me a blank one with no holes so I was able to drill it with 4 holes.

      I do have a question for you and hope you can assist. I've stripped mine down about a year back and it's been laying in bits in a dark corner. Rather embarrassingly I've one brass fitting here and I'm not sure where it goes! See attached picture.

      I'm thinking it may go on the 3 way solenoid and sit inside vent pipe to suppress the output when you stop the shot the but I'm not sure, any chance you can take a look at yours and let me know?

      Cheers,

      Chris.
      Attached Files

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      • #33
        My first guess is it screws into the steam takeoff at the boiler, with the steam pipe piggybacked into it.

        Every chance I am wrong about this...

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        • #34
          Yep, looks like a partly stripped down Emergency Pressure Release Valve...

          Mal.

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          • #35
            I agree with Jackster and Mal. I don’t have the old pressure release valves so can’t strip one down to confirm but I can’t see what else it would be.

            Hope you aren’t far from getting your machine back together!

            Speaking of which, mine is now reassembled. Got water into the boiler, found two very small leaks (on both ends of the heat exchanger) which have now been resolved. Today will be spent with some bench tests before I lug the beast to its new home in the kitchen.

            Below are some before/after pics as promised:

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            • #36
              Bloody terrific job solace, a credit to you mate...

              Mal.

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              • #37
                Nice work Solace, well done.

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                • #38
                  Thanks all!

                  Almost done, appears there is an issue with the hot water tap. I opened it up to test but now it won’t shut fully which means the machine can’t come up to pressure - had the machine running happily for a few hours until that test

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                  • #39
                    Originally posted by solace View Post
                    Thanks all!

                    Almost done, appears there is an issue with the hot water tap. I opened it up to test but now it won’t shut fully which means the machine can’t come up to pressure - had the machine running happily for a few hours until that test
                    Did you replace the o-ring inside that valve?


                    PS. I just remembered that I’ve still got a few spare parts left over from my restoration. Send me a PM if you are interested in anything. The one part in particular that could be of interest is a group head bell. These have been discontinued and Boema only had one left a couple of years ago.

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                    • #40
                      Originally posted by LeroyC View Post
                      Did you replace the o-ring inside that valve?


                      PS. I just remembered that I’ve still got a few spare parts left over from my restoration. Send me a PM if you are interested in anything. The one part in particular that could be of interest is a group head bell. These have been discontinued and Boema only had one left a couple of years ago.
                      Thanks LeroyC, I am pretty good for parts but will message you later anyways to see what you have - helping another non-forum member do the same restore so he might be after some parts you have.

                      When you say o-ring inside the valve, which specific o-ring are you referring to?

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                      Inhave replaced both both of these, I think the issue might be with the plunge assembly but I can’t work out how to remove it!

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                      • #41
                        Another Boema Restoration Thread

                        Originally posted by solace View Post
                        Thanks LeroyC, I am pretty good for parts but will message you later anyways to see what you have - helping another non-forum member do the same restore so he might be after some parts you have.

                        When you say o-ring inside the valve, which specific o-ring are you referring to?

                        [ATTACH=CONFIG]22092[/ATTACH]

                        Inhave replaced both both of these, I think the issue might be with the plunge assembly but I can’t work out how to remove it!
                        To service taps properly you need to open them up and replace the internal seal that’s found on the spindle shaft. This is something that techs do routinely whenever they service an espresso machine. To get in there you undo the brass nut that’s on the end of the valve assembly. If you haven’t done this yet you definitely need to. If you have done it but are getting a valve that won’t close it’ll be because you haven’t put it back together properly and it’s essentially stuck open.

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                        • #42
                          Do those taps seal brass on brass, or is there a viton tip or something?
                          My sunbeam taps are brass on brass, and mine leaks slightly even after cleaning up the seat. Will try some lapping compound if I ever take top off the machine.

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                          • #43
                            Most prosumer machine steam/water valves these days use commercial units which close on a rubber type valve seat or a series of O-Rings fitted to the valve shaft. No need for any 'lapping'...

                            Mal.

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                            • #44
                              Okay, taps (including all internals) now fully services (my bad) and the machine is purring along nicely!

                              Will keep it powered up for a few hours without making a coffee just to make sure it is 110% before moving it inside.

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                              • #45
                                Nice work, I have replaced the tap internals on mine so have left over bits if you need some.

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