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Re: [APD] Eheim rattle

----- Original Message ----- 
From: "S. Hieber" <shieber at yahoo_com>
To: "aquatic plants digest" <aquatic-plants at actwin_com>
Sent: Friday, November 21, 2003 4:15 PM
Subject: Re: [APD] Eheim rattle

> I never tried putting oil on the moter parts of an Eheim,
> but I never thouhgt it should be necessary

It is not necessary...
Only when the axis had become thiner and you just cleaned it.
The oil should prevent jolting till mud (?) replaces it...
Reversing the axis makes thicker places touch the rotor too.

> -- the moving
> parts are water lubricated and water cooled. If that's not
> sufficient for proper operation, I would think that some
> part replacement is in order. 

Sure but reversing the axis is the first thing to do...
Surely how far the axis is stuck in the bottom rubber
also changes the contact points.
Perhaps that after cleaning the rotor hesitates between
the old thinest place on the axis and the water flow
induced position, making noise ?

The oil should prevent this till the change in axis diameter
is reduced ?

> It's interesting that oil
> might quiet a noisy rotor. I wouldn't have expected the oil
> to remain long, being totally submerged in water inside the
> motor.

I agree !

> How long between oilings?

If you clean the filter every month and the motor every 4 months
I would reverse the axis each time, changing the axis every 5 years
and the rotor every 10 years.  Roughly ;-)

I only use peanut oiled fingers to rub the axis when :
1. there is noise after I reinstall it AND
2. any noise due to air trapped somewhere has gone

In fact I don't remember the last time I had to reopen everything for doing it...


> Scott H.
> --- Philippe Lemaire <ph_lemaire at CompaqNet.be> wrote:
> > Hello,
> > 
> > I have a twelve year old 2213...
> > 
> > When you remove the top you can open a rotating door...
> > Carefully because there is a rubber inside !
> > 
> > You see then the rotor and a ceramic (hard but breaky)
> > axis.
> > After some time the rotor wears the axis making it glad
> > at two places :
> > making it too thin and allowing noise...
> > 
> > Solution 1 is to put some oil
> > Solution 2 is to extract the axis from the other rubber
> > (you don't see it)
> > carefully not to break it and inverse it in such a way
> > the rotor touches
> > a thicker place (adding oil now shall be a good idea :
> > ONE toothpick drop).
> > 
> > Then you put all in place and close again...
> > 
> > Philippe
> > 
> > In Belgium new axes are quite cheap.  At the end the
> > rotor can become worn out
> >  which is more expensive to replace.  But if you change
> > the filter every 20 years
> > it is OK to change it after 10 years ;-)
> =====
> S. Hieber

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