Pump creep

Discussion in 'Fettling Forum' started by David Lawlor, Mar 24, 2019.

  1. David Lawlor United Kingdom

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    Hi guys. I know this may well have been covered (I have searched unsuccessfully) but I have a 246 B and although I purchased it a few months ago after it had received a full seal change I used it yesterday only to discover that when I pumped it up the pumping rod started to creep out on its own. I pushed it back in and out it came again. Any thoughts.
     
  2. Norman

    Norman United States Subscriber

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    Hi David,

    The NRV needs to be serviced. There are several options to look at.

    1. Fettlebox

    Tilley Washer Kit - The Fettlebox

    2. Tilley Lamp

    Service pack 1

    Here's a schematic of both the pump and control cock. It's always good to service both. Also what the service kit.
    ex_pump-500x500.jpg ex_cock-500x500.jpg Service Pack SP1_600-500x500.JPG

    I hope this information helps.

    Cheers,

    Norman
     
  3. Henry Plews

    Henry Plews Subscriber

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    Hi David, the rubber seal in the non-return valve at the end of the pump is not doing it's job. Have a close look at it, it may not be seating properly because a) they are poorly made or, b) there may be a speck of dirt on it. Whilst it's apart, try stretching the spring a little. You could also clean / polish the end of the pump tube with 0000 gauge wire wool.

    edit: Crossed with Norman.

    Henry.
     
  4. David Lawlor United Kingdom

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    Sincerest apologies but after studying the diagrams kindly put on this thread I realised I should have said 246 A not B. Really sorry for the confusion, something of a senior moment. Obviously this will change a few things as some of odds and ends wil be marginally different.
     
  5. Henry Plews

    Henry Plews Subscriber

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    Hi David,

    Refer to the Fettlebox link and images posted by @Norman, you'll see that the only difference is the shape of the rubber pip in the valve. Those supplied by Fettlebox are a disc which sits in a brass cup, the later ones are shaped so that they sit directly in the spring.

    Henry.
     
  6. David Lawlor United Kingdom

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    Thanks for this guys. Will try as advised and see what happens.
     
  7. Digout

    Digout Australia Subscriber

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    Hi David,

    One way or t'other, would you get back to us and let us know how you get along?


    Thanks
    Digout
     
  8. David Lawlor United Kingdom

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    I have this evening successfully halted the creep. Thank you everyone for the advise. I took out the new seal and reseated it with a little more enthusiasm and that seems to have put pay to it.
     

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