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Thread: Group seal leak/blowout

  1. #1
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    Default Group seal leak/blowout

    Well this is a bit odd....

    Just started happening this has. When I rebuilt the Personal 1, I replaced the original and very knackered NS group seal (OEM on this machine was 7mm, at least that's what came off it anyway) with a new, admittedly thicker at 8.3mm blue silicone one about 6 months ago. I didn't bother putting the paper shim behind the new seal due to the extra thickness taking up the slack, worked fine, PF locks in spot on etc etc.

    Now as of last week it fairly regularly blows out of the group head at random, crapping water everywhere. I've pulled the seal, looks fine. Clean, still flexible, no damage. Reseating it solved the problem for 10 or so shots then BAM it's out again.

    The only other thing that has changed recently is I replaced the pump, but the pressures etc are all as previous. No change there.

    Your comments, thoughts and wisdom, as ever, welcome. Also sarcasm.
    Nuova Simonelli Personal 1 ¦ Mazzer SJ

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    Default

    Quote Originally Posted by spoxehub View Post
    Well this is a bit odd....

    Just started happening this has. When I rebuilt the Personal 1, I replaced the original and very knackered NS group seal (OEM on this machine was 7mm, at least that's what came off it anyway) with a new, admittedly thicker at 8.3mm blue silicone one about 6 months ago. I didn't bother putting the paper shim behind the new seal due to the extra thickness taking up the slack, worked fine, PF locks in spot on etc etc.

    Now as of last week it fairly regularly blows out of the group head at random, crapping water everywhere. I've pulled the seal, looks fine. Clean, still flexible, no damage. Reseating it solved the problem for 10 or so shots then BAM it's out again.

    The only other thing that has changed recently is I replaced the pump, but the pressures etc are all as previous. No change there.

    Your comments, thoughts and wisdom, as ever, welcome. Also sarcasm.
    Dodgy portafilter?
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    Quote Originally Posted by joey24dirt View Post
    Dodgy portafilter?
    HAHAHAHAHAAAAA

    Nah mate, this happens with the PF you made AND the OEM NS one.
    Nuova Simonelli Personal 1 ¦ Mazzer SJ

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    Default

    I assume the pf is unwinding from the group, not that the seal is coming out?

    You using an aftermarket silicone seal?
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    Group seal inserted the wrong way up ?

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    Quote Originally Posted by DavecUK View Post
    I assume the pf is unwinding from the group, not that the seal is coming out?

    You using an aftermarket silicone seal?
    No mate, with the PF locked in, the seal is blowing out of the group head. It’s pretty impressive.
    Nuova Simonelli Personal 1 ¦ Mazzer SJ

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    Quote Originally Posted by espressotechno View Post
    Group seal inserted the wrong way up ?
    Could be....it’s got ridges one side and a smooth other side. I installed ridges up. So smooth meeting the PF.
    Nuova Simonelli Personal 1 ¦ Mazzer SJ

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    That's the correct seal install.
    Is the silicone seal a loose fit, or a tight fit ? ( It should be a tight push-fit)

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    Quote Originally Posted by espressotechno View Post
    That's the correct seal install.
    Is the silicone seal a loose fit, or a tight fit ? ( It should be a tight push-fit)
    Tight push fit it is.
    Nuova Simonelli Personal 1 ¦ Mazzer SJ

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    Blocked shower screen?
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