Monitor stove.

Discussion in 'Fettling Forum' started by manfrommanchester, Nov 13, 2019.

  1. manfrommanchester

    Offline
    Joined:
    Jan 8, 2013
    Messages:
    40
    Got one of the above . Not used it for about 9 months. However when I did seems the NRV is seized up. ( When I pump it there is only resistance. ) How do I go about freeing it. Hopefully without resorting to having to take it out.
     
  2. presscall

    presscall United Kingdom SotM Winner Subscriber

    Offline
    Joined:
    Aug 25, 2009
    Messages:
    8,579
    @manfrommanchester
    Prop the stove tank with the pump tube vertical, pump removed, and spray/pour releasing fluid/oil in the pump tube to give the NRV innards a good soak - it penetrates through the air inlet hole in the NRV head. Leave it there as long as patience allows.

    No guarantee it’ll work but a good chance.
     
  3. Tony Press

    Tony Press Australia Subscriber

    Offline
    Joined:
    Jun 8, 2013
    Messages:
    5,847
    Location:
    Stinkpot Bay, Howden, Tasmania, Australia
    ...and after that, half fill the pump tube with paraffin and force it through the NRV with the pump.

    Cheers

    Tony
     
  4. kerophile

    kerophile United Kingdom SotM Winner Subscriber

    Offline
    Joined:
    Sep 23, 2004
    Messages:
    11,347
    Location:
    Far North of Scotland
  5. Twoberth

    Twoberth Spain Subscriber

    Offline
    Joined:
    Feb 21, 2017
    Messages:
    350
    Location:
    England
    I usually do what @presscall suggests, and after a few minutes I poke a thin, flat-ended wire (e.g. a length of bicycle wheel spoke) through the air hole and lightly press down. More often than not this opens the NRV, and the releasing oil flows through the hole and lubricates the spring and case bore walls.

    If it doesn't release under slight pressure I leave if for a while longer and then try again.
     
  6. manfrommanchester

    Offline
    Joined:
    Jan 8, 2013
    Messages:
    40
    Worked. Cheers guys!!!!!
     
  7. Simes

    Simes Subscriber

    Offline
    Joined:
    Jul 26, 2004
    Messages:
    3,989
    Location:
    I'm on the way....
    Indon't think I could fettle without an old bike spoke. :thumbup:
     
  8. Marc

    Marc Subscriber

    Online
    Joined:
    Nov 4, 2015
    Messages:
    3,503
    Location:
    Oregon, USA
    I use TIG welding rod for the same purpose. :thumbup: