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Isomac Mondiale leaky steam wand

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  • Isomac Mondiale leaky steam wand

    Hi all
    My steam wand is leaking again. A few years ago I changed the o-rings myself but the leak started again soon after. For the next two years I had my machine serviced professionally once a year and the leaking stopped for almost a year each time. This year I thought I'd try do it myself again so I ordered another set of o-rings. To install, I found the bit of food-grade grease that I've had left in the cupboard from last time, and replaced the 3 small and 2 larger o-rings in the valve section, giving each one a rub with some grease before fitting it, then replaced the one in the ball joint and tightened it all up. I overtightened the ball joint and it was a bit stiff to move the wand but the leaking was fixed and was good for a few weeks but then started leaking again. So I used my last set of o-rings and did the job again. Leak stopped again, but this time it only lasted 2 days and is now as bad as ever. By wiggling the flick tap thingo that these Mondiale machines use, I can sort of find a spot where the hissing nearly stops but it doesn't shut off completely. Anyone have any tips on what I might be doing wrong?
    Thanks
    Geoff

  • #2
    Originally posted by Cooper69S View Post
    Hi all
    My steam wand is leaking again. A few years ago I changed the o-rings myself but the leak started again soon after. For the next two years I had my machine serviced professionally once a year and the leaking stopped for almost a year each time.
    Geoff
    I suspect you've answered your own question Cooper.

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    • #3
      Sounds like the clearances are not right and the valve is always slightly on as the lever is compressed too much. Loosening the collar should allow a bit more play in the lever and stop it dribbling, then you just have to find a way of locking it there. Unless the tap seal itself or the closing spring is gone, then you will need to rebuild the whole valve

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      • #4
        Originally posted by Yelta View Post
        I suspect you've answered your own question Cooper.
        If you mean I should just take it to a professional again, I guess I can, but the place I was taking it to is about 150km away and they keep the machine for about a week usually, so if I can do it myself that would be preferable. Also they're not open weekends so I need to get my wife to take a day trip to drop it off then again to pick it up. There is another coffee machine place I'm planning to take it to so they can have a look at the temperature stability of the machine, and they could sort out the steam issue too I'm sure, but they're 200km away.

        Originally posted by coffee_machinist View Post
        Sounds like the clearances are not right and the valve is always slightly on as the lever is compressed too much. Loosening the collar should allow a bit more play in the lever and stop it dribbling, then you just have to find a way of locking it there. Unless the tap seal itself or the closing spring is gone, then you will need to rebuild the whole valve
        I tried loosening it slightly but it was worse. I'm waiting for it to cool down and I'll pull it apart for another look. As for rebuilding the valve, I assume that just means buying a new valve? I don't see anything in there that can be "rebuilt" as such...?? the only parts are the o-rings, lever, spring, and the inner and outer metal valve sections (not sure what the correct name for those parts is).

        Thanks
        Geoff

        Comment


        • #5
          There is an outfit in Melbourne that put a 'kit' into the old Mondiale steam/hw toggle assemblies.

          You can also retro fit the new design, if you want a complete replacement.

          If you're interested in talking to them, send me a pm; they are not sponsors.

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          • #6
            I pulled it apart again and there seems to be too much clearance around the small O-rings in the piston part of the valve, like they're slightly too small/thin. Is there any problem with just using thicker o-rings, if such a thing exists??

            Originally posted by chokkidog View Post
            If you're interested in talking to them, send me a pm; they are not sponsors.
            Pm sent, thanks
            Last edited by Cooper69S; 8 February 2014, 04:46 PM.

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            • #7
              I went to a hydraulics place today and bought some thicker o-rings and the leak has stopped. The question is how long it will last this time. Wait and see...
              Be interesting to see what these "kits" are though...

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