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Brugnetti 40.7 1994 resto

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  • #16
    Re: Brugnetti 40.7 1994 resto

    Cheers Mal. Ill just flush it out and clean what i can with a small brush.

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    • #17
      Re: Brugnetti 40.7 1994 resto

      Originally posted by Segrave link=1176371710/0#13 date=1176469715

      Just a question about the above pic, can this bit of the 3-way be put in an acid bath or is there something in there that shouldnt be put in acid ?

      Lastly those 3 brass Bolts you see in many of those pics, they can be removed and there is a hollow cavity between them. I was just wondering if anyone knew what this was for? (perhaps some kind of quick group heating/cooling if pipe were put in?)
      Segrave,

      Firstly, as Mal said, Id be very careful what you put in HCl.... and I wouldnt do it to valves etc. Many do clean stripped down 3 way assemblies in citric acid - a lot milder than HCl....

      Re 3 brass bolts.... Im guessing here but have similar "blanking" bolts in the la Cimbali group.... and they fill holes which were drilled to allow access for machining the water ways etc..... Other than in helping manufacture, they have no real use.... and are just blanked with a bolt.

      By the way, the group and HX assembly looks remarkably similar to a La Cimbali (except the attachment to the boiler is different) and your group is a little lighter - even at 2.7Kg .... from memory the la Cimbali group and heavy brass PF clamping ring are a bit more than 4 KG!!! (Brass all the way back to the boiler as well)

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      • #18
        Re: Brugnetti 40.7 1994 resto



        Use hot citric acid. Thats what I used to clean a set of 3-way valves, and it worked pretty well. The acid will dissolve out the zinc from the alloy, leaving it salmon pink. This can be polished back to a nice brass finish without doing any harm.

        As others have said, be careful using HCl as it is a much stronger acid. If you dont get the dilution right, youll end up dissolving some of the metal.

        BTW: coffee oils come off easily in a conc caustic soda solution. This wont harm the metal apart from a slight tarnish. I do the caustic soda soak first to remove the oils, then the acid bath to get the metal looking good.

        Cheers,

        Mark.

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        • #19
          Re: Brugnetti 40.7 1994 resto

          ok guys i need a hand here i have some screws giving me major problems



          tha above circled screws are about 14mm wide and slot is quite thick, i have a 12mm screwdriver but i cant get them to budge i made a custom screwdriver that fits right in them out a cold chisel and used a spanner and to provide the tourqe which did move 2 of them half a turn but then they were even more stuck. I went out to bunnings to buy and impact driver but the problem was they only had at best 8mm heads whcih would be very loose in these screws and probly mangle them quite a bit.

          So i was sondering if anyone had any tips or if they had an impact driver which a 12mm(or bigger) flat head bit and could tell me where you got it from.

          thanx

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          • #20
            Re: Brugnetti 40.7 1994 resto

            Im afraid an impact driver will be of little use unless the blow is substantial, and the screw is in quite substantial material, too. :-/

            Hammering into those screws would probably just bend the frame.

            A little penetrating oil perhaps, not sprayed on, but applied with a stick perhaps, might be a safer bet.

            Otherwise, heat. If you can carefully apply a gas torch with a very thin tip and flame to the screw to expand it and crack it lose, that might do it.

            Theres always a stubborn one, isnt there?

            Good luck,

            - Robusto

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            • #21
              Re: Brugnetti 40.7 1994 resto

              Originally posted by robusto link=1176371710/15#19 date=1176630403
              Im afraid an impact driver will be of little use unless the blow is substantial, and the screw is in quite substantial material, tool. :-/

              - Robusto
              Robusto....

              Are you sure your last word in the sentence above is correct :-[ I would imagine you meant too.....

              Penetrene is better for freeing corroded bolts than the more normal WD and CRC stuff.... and rock the screw clockwise and anticlockwise rather than trying to get it out in one go....

              But yep, heat is often a good solution...

              Comment


              • #22
                Re: Brugnetti 40.7 1994 resto

                Well picked, JavaB -- that extra "l" will do it every time. Yes, "too" is the operative word.

                I cant see an impact driver being useful on those frame members. They would absorb the shock by bending in.

                Good old Penetrene seems to have been superceded by WD40 and other sprays, but I remember it was super thin and flowed very very easily -- just whats needed.

                Segrave, Id suggest building a small dam with bluetack or similar around the screw head, fill it wil Penetrene and allow it to do its job over several hours.

                --Robusto



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                • #23
                  Re: Brugnetti 40.7 1994 resto

                  Hi All,

                  Penetrene is still very widely used by mechanics et al, much better than the WD40 and clones and easily obtained from Bunnings, Home Hardware, etc. Helped me out considerably with disassembling the little Bezz and not a stripped thread in sight , and its also cheap and even a small bottle will last for ages.

                  Mal.

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                  • #24
                    Re: Brugnetti 40.7 1994 resto

                    Hey guys i haven had any luck with the screws yet but i have purchased an entire new amchine same model a year newer working with pump motor,water filter and 3 PFs for $200 yes $200 so lets say i have ample part and such but the plan is to get both going and clean ;D pics soon

                    Comment


                    • #25
                      Re: Brugnetti 40.7 1994 resto

                      Wow, thats an extreme attitude. Youll either make it twice as easy with parts aplenty... or twice as hard trying to get both to go! Good luck.

                      -Robusto

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                      • #26
                        Re: Brugnetti 40.7 1994 resto

                        Either way it should be fun robusto

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                        • #27
                          Re: Brugnetti 40.7 1994 resto

                          Originally posted by Segrave link=1176371710/15#23 date=1176718031
                          Hey guys i haven had any luck with the screws yet but i have purchased an entire new amchine same model a year newer working with pump motor,water filter and 3 PFs for $200 yes $200 so lets say i have ample part and such but the plan is to get both going and clean ;D pics soon
                          Segrave...

                          WOW thats one way to ensure you have plenty of spares... should make restoration a lot easier.... (but dont reuse gaskets seals etc - even if they look good... just false economy)

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                          • #28
                            Re: Brugnetti 40.7 1994 resto

                            Have it side by side on your kitchen counter!

                            Comment


                            • #29
                              Re: Brugnetti 40.7 1994 resto

                              Coffee kid there is no surface in my house long enough

                              Javab NO way would i do that i just gonna order 2 of everything. Little expensive with the boiler cap gaskets but owell

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                              • #30
                                Re: Brugnetti 40.7 1994 resto

                                So your going to restore both machines? Think of the power bill!

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