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Impeller Shapes?

Home Forums Fresh and Brackish Water Fishes Impeller Shapes?

This topic contains 8 replies, has 3 voices, and was last updated by  Sirkus 10 years, 6 months ago.

Viewing 9 posts - 1 through 9 (of 9 total)
  • Author
    Posts
  • #299325

    Sirkus
    Member

    Hey all!

    im having a bit of a problem with the impeller in the external filter on my 180l, the pump is a Fluval 304 and what i assume to be the impeller is making a gawd awful noise! its so bad that it woke me up last night (and i sleep like a baby!). ive had a look at the impeller and compared it to a 104 (never been used) we bought for £5 for spares at that big fish show down at ‘hayland island’. i noitced that the impeller pieces kinda separated in my hand on the 304 whereas they were all in one piece on the 104. so ive decided im going to get a new impeller for it off ebay unless someone tells me there s a cheaper way? I’ve noticed there are 2 different types of impeller available to me and unfortunately im no fluid mechanic so i was hoping someone here might be, or at least know the answer to my question?

    Thanks

    Kris

    #303942

    dunc
    Keymaster

    Well mate, I had a bit look around on google for you and noticed the text on this auction:

    Fluval 304 replacement impeller shaft assembly.

    QUOTE
    This Auction is for brand new and boxed Hagan Fluval impeller shaft assembly for the 304/404 filters.

    Please note that there are two types these. This model is for use with models prior to July 2001 and the curved blade impeller.


    So, there’s two types of impeller. Which be yours young Sir?

    #303943

    Sirkus
    Member

    mines the curved bladed impeller so i think you’ve made it clear for me now. ive played around with the impeller and think its sounding alot better except for the resonating sound coming from it which (in a sherlock moment) i believe indicates the impeller and shaft need to be replaced, they are about 4-5 years old anyways. thanks for the help Dunc.

    Kris

    #303944

    dunc
    Keymaster

    Phooar, 4 to 5 years old?

    #303945

    dunc
    Keymaster

    Oh, one more thing.. just found this article:

    QUOTE(fins.actwin.com)
    Diana Berberich has a noise Fluval 304, replaced all the
    parts in the impeller assembly and it still has a clatter.
    What’s the matter?

    I have had similar problems with Marineland powerheads.
    Within a the warranty period, Marineland will send you a
    new rotor. If that doesn’t work, they will send, you
    guessed it, another rotor. If that doesn’t work, they will
    send a new powerhead. Or so has been my experience.

    These two-pole, permanent magnet rotor, AC motors are
    extraordinarily simple. In motors of this type, people
    often say there is only one moving part, meaning the
    magnetic rotor, which spins within a “rotating”
    electromagnetic field generated by a pair of coils housed
    around the rotor (usually sealed in epoxy or some other
    potting material). If the rotor is the only moving part
    and it ain’t rubbing, what else could possibly make the
    clatter? Well, probably the second moving part that they
    all have.

    The common culprit on Marineland powerheads is the
    water-vane wheel, which is the small set of blades that
    actually spin the water, forcing it through the powerhead
    or pump. These wheels are not fixed to the rotor shaft but
    can rotate freely about 225 degrees or about 3/4 of a turn.
    If these wheels are just a tad too loose, they will cause
    the pump or powerhead to clatter.

    Old rotors can have wheels that have worn loose. This is
    one reason most powerhead manufacturers forbid using on/off
    cycling timers (so-called wave makers) on their powerheads;
    it promotes an early end of quiet life for the rotor wheel.

    *But new rotors can have wheels that are too loose,*
    although the rate of occurrence seems to vary by
    manufacturer. In my small experience, Marineland has a
    high probability and Eheim an extremely low one. (How many
    Marinelanders say their Magnum is quiet vs how many
    Eheimers?)

    Other factors that can cause a clatter: worn or poorly
    fitting bearings or misaligned bearing seats. But I think
    this is a rather rare reason for pump clatter. Bearings
    can be replaced if they are at fault but seat alignment can
    be harder or easier to deal with. It can be harder because
    the seat alignment is generally fixed by the manufacture of
    the pump housing. But it can be easier because, with some,
    a little push here, a little realignment pressure there and
    you can help to quiet a noisy pump — but only if bearing
    seat alignment is the culprit in the first place.

    If you’re having trouble even after replacing the impeller and shaft, have a browse through that ^.

    #303946

    Sirkus
    Member

    Thanks again Dunc! i did notice when playing with the impeller again that one side of the plastic that surrounds the shaft was more worn on one side which makes perfect sense for the sound. guna buy both bits on ebay now.

    Thanks again Dunc.

    #303947

    dunc
    Keymaster

    No bother matey

    #303970

    Adam
    Participant

    Hello Sir

    (I thought I would add my 2p worth)
    And agree with Dunc

    If you buy the entire assembly i.e. impellor
    (Shaft and blade) you should cover yourself
    IME rattling like that is usually caused by an
    impellor which has worn down and is no longer
    perfectly balanced usually blades.
    (That is when it doesn’t disintegrate in your hands when you first take it out)

    So a new shaft on its own would make little difference
    (unless it is egg shaped)
    Try rolling it across a smooth surface to see how even it is

    Any way good luck with the replacement

    Ad

    #303990

    Sirkus
    Member

    Hey Adam, nice to speak with you again, Ive got the new impellor on now and seems to be quieter but only after a couple of hours of running. thanks for the advice though

    Kris

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