Announcement

Collapse
No announcement yet.

La cimbali M29 (Basic) Help - Water Overflow

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • La cimbali M29 (Basic) Help - Water Overflow

    Hello all Friends,

    I am a new bee on this forums site.
    Having a slow water leakage issue with recently installed (a second hand machine approximately 7 years old)
    Water is continuously dripping from the little overflow down pipe connected to the head group which goes into the base tray (connected to drain pipe)

    I tried shutting off the mains water supply - it stops after some time if the main water supply is turned off and slows down if mains water supply pressure is controlled by turning the manual tap valve (slightly shut) which means not fully open.
    Is it normal or is there some serious issue which I need to get fixed straight away?

    Please advice what to do to fix this problem.

    Regards,

  • #2
    It sounds like a bad or gunked up 3-way valve. Try doing a backflush or two or three and see if that solves the problem.


    Java "Still loving Simba" phile
    Toys! I must have new toys!!!

    Comment


    • #3
      Hi Javaphile,
      Thanks for a quick reply buddy :-)
      As suggested I've tried back flushing 3 to 5 times at different times however it did not make any difference so far.
      Can it be something to do with the little solenoid attached in between the head group and back flush down pipe?
      Please advice what should I do next?
      Regards,

      Comment


      • #4
        Have you backflushed with detergent? Not the kind for dishes but the kind specifically made for backflushing an espresso machine. If you don't have any it is readily available from many of our sponsors.

        That solenoid is the 3-way valve.


        Java "Keeping the pipes clean!" phile
        Toys! I must have new toys!!!

        Comment


        • #5
          Yes, I did it with the detergent especially made for espresso machines cleaning, I think i should try for few more times as this machine was sitting in stoarage from the last 7 months before i bought and if there is any gunk sitting in this valve it may take some time to clear.. thanks again and I will get back to you after doing back flush again.

          Comment


          • #6
            If the backflushing doesn't work the next step I would do would be to isolate the problem part by swapping the coil with one from another working group. If the same head still leaks then the problem is with the valve. If the problem follows the coil then obviously the problem resides with the coil. If it's the coil that's bad replace it.

            If the problem stays with the head/valve I'd disassemble the 3-way valve, soak it (Just the valve assembly, not the coil of course!) in a detergent solution and manually clean it. Once reassembled, replacing any o-rings and washers in it, I'd do another few backflushes with detergent followed by ones with no detergent. If it still leaks after that I'd be looking at replacement.

            All of this presupposes you're comfortable and capable of performing this work and know how to safely work around electricity and water. If you don't know how to safely work around them then DON'T!!! Take the machine to a qualified service center instead.


            Java "Electricity kills!" phile
            Toys! I must have new toys!!!

            Comment


            • #7
              Hi There, Thanks once again for your support, Would it be possible to have a copy of repair manual for this model?
              is it available online any link or suggestion please...
              Regards,

              Comment


              • #8
                Sorry, I've never seen nor heard of a repair manual.


                Java "Fixerupper" phile
                Toys! I must have new toys!!!

                Comment


                • #9
                  Sorry, I meant owner's manual.
                  Great help, Thanks I got the valve replaced it was badly chocked by water scaling gunk. no leakage any more.
                  Very kind of you dear Javaphile :-))

                  Comment


                  • #10
                    While there are manuals for several other La Cimbali models floating around I've not seen one for the M29.


                    Java "Sorry!" phile
                    Toys! I must have new toys!!!

                    Comment


                    • #11
                      Hello Javaphile,
                      It's been a long time since I have posted here. Just wish to have your advice on a recent issue with this M29.
                      This time it's leaking from the *overflow valve* of its *water pump* there is a spring inside with a screw with a tiny hole in it. I tried adjusting the screw but did not help. Water is coming out of tiny hole in the screw on this overflow valve.
                      Machine also makes squeaking noise whenever we extract coffee or whenever it takes water intake from main water supply (sounds like it's trying too hard)
                      When I turn main water supply off - leak stops.

                      PLEASE HELP
                      REGARDS

                      Comment


                      • #12
                        First off before doing any disassembly inside the machine UNPLUG IT and turn off the water supply.

                        The overflow valve, circled in green, is located in a brass assembly located under the drip tray on the right side near the the black plastic box that the drip tray drains into. The overflow valve has a plastic hose (Blue arrow.) that connects up to the back of the drain box (Red arrow).

                        Click image for larger version

Name:	DCP_1091-Edited.jpg
Views:	1
Size:	368.3 KB
ID:	745841

                        When the machine is making the squeaking noise you speak of is there water coming out of this hose into the black drain box? If so loosen the set screw (On the left side.) and turn the screw until the noise/water stops and then turn it 1/4 turn more and tighten the set screw.

                        The valve on the pump, circled in yellow in the picture below, is a bypass valve used for setting the pump's output pressure. (Your pump may look different as this one is an older style/design.) If this is where the water is coming from and the above adjustment hasn't fixed the problem then remove the screw and any other parts in the adjustment mechanism and clean them and the interior to remove any debris/scale. Then reassemble it and adjust the screw until your gauge shows 9 bars pressure when pulling a shot. If your machine doesn't have a gauge that shows pump pressure you'll either need to acquire a gauge or count the number of turns it takes to remove the bypass adjustment screw and when reinstalling it turn it in that amount which should get it close to the needed 9 bars. To get it properly adjusted though will take a gauge. If cleaning the bypass mechanism doesn't stop the leak then you're probably looking at having to replace the pump.

                        Click image for larger version

Name:	DCP_1097-Edited.jpg
Views:	1
Size:	295.1 KB
ID:	745840

                        To do either of the above adjustments will require the machine running. Hence you will be working around live 240v and water. 240V kills! If you're not comfortable and knowledgeable working around live 240v DON'T! Bring it to a tech who is!


                        Java "240v kills!" phile
                        Toys! I must have new toys!!!

                        Comment


                        • #13
                          Thanks for your quick reply Phile, water is coming out of bypass valve on the pump. As you shown in 2nd picture circled with yellow. It started with a very slow drip - I did remove the screw and a spring behind the screw refitted 6 months ago - it did not stop the leak so I have run a flexi hose from leaking valve to a bucket to stop the mess temporarily.
                          Leak has increased today and continuous even when pump is not running or even when machine is tired off.
                          Squeaking noise has become very frequent and obvious from few weeks. In the past noise was not that frequent.
                          May be the screw and spring in the valve may have gone loose? If we tighten this screw that means we are REDUCING the pump's out put pressure or INCREASING it??

                          Comment


                          • #14
                            Do have a gauge which reads from minimum of 0 to max of 2,5
                            (Funny numbers) 0 to 0,8 is blue colour, 0,8 to 1,6 is Green then from 1,6 to 2,5 is red. My gague Indicator sitting in green - between 0,8 to 1,6.
                            Did not notice reading while pulling shot. Will do that too however question is where in this reading it should read exact or near 9 Bar ?

                            Comment


                            • #15
                              Hhhmmm....Been a long time since I needed to make an adjustment. I think clockwise increases the pressure.

                              Do have a gauge which reads from minimum of 0 to max of 2,5
                              (Funny numbers) 0 to 0,8 is blue colour, 0,8 to 1,6 is Green then from 1,6 to 2,5 is red. My gague Indicator sitting in green - between 0,8 to 1,6.
                              That's showing the pressure in the boiler, not the pump pressure. Not all Cimbali's have a pump pressure gauge.


                              Java "Gauging it" phile
                              Toys! I must have new toys!!!

                              Comment

                              Working...
                              X