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Impeller Shapes?
April 4, 2007
11:08 am
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Sirkus
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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

April 4, 2007
11:39 am
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dunc
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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?

April 4, 2007
11:45 am
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Sirkus
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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

April 4, 2007
11:55 am
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dunc
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Phooar, 4 to 5 years old? /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" /> I'm amazed they've lasted that long. Aye mate - I'd change them regardless.

April 4, 2007
11:57 am
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dunc
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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 ^.

April 4, 2007
1:48 pm
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Sirkus
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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.

April 4, 2007
3:04 pm
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dunc
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No bother matey /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

April 16, 2007
5:12 pm
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Adam
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April 13, 2007
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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

April 22, 2007
1:25 pm
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Sirkus
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March 25, 2007
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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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