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General Liquid/Water Cooling Discussion For discussion about Full Cooling System kits, or general cooling topics. Keep specific cooling items like pumps, radiators, etc... in their specific forums.

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Unread 09-29-2001, 09:07 PM   #1
Nordic
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Default Eheim impeller damaged?

In this thread there was a discussion about reservoirs/air-traps: http://forums.procooling.com/ubbcgi/...c&f=2&t=000612

Now I've gotten myself a nice air-trap that seems to work great and clears out the air from my cooling system within 15 minutes. BTW, the system consists of a DD Maze-2, DD LPD rad(100x150x20) and an Eheim 1048 (a 3/8" or 9mm in-line system).

Last time I had this little air in the system was when I first installed the system and made a test-run on the kitchen table (for two weeks.. ) Back then, the pump made virtually no noise except for the low humming you always get.

After I installed the system in the case, a rattling sound slowly appeared and I couldn't get rid of it. I blamed the air in the system as you could clearly hear the pump smash air bubbles in the impeller housing when you powered it up after leaving it off for a while. I discovered that the "T" in my in-line system didn't behave as the air-trap I had hoped, no air could be seen rising into it. But I lived with it as I had no time to correct it then.

Now when I have an air-free system I hear the same rattling noise that I had before the air-trap was installed. The impeller shaft bearings seems to have been worn out, am I right? Does anyone have any experience with this issue?

I know someone (Unaclocker?) had an article in which he described how to mod the impeller by removing the 180 degree "play" it has around the shaft supposedly getting rid of the noise. Basically you glue the impeller to the magnet (not the shaft!). This idea could possibly have some drawbacks in an aquarium but I see benefits in a computer cooling system (low noise). Anyone have an URL?

[ 09-29-2001: Message edited by: Nordic ]
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Unread 09-30-2001, 05:56 AM   #2
BladeRunner
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One other posibility is cavitation? Try squezing the pump outlet tube to reduce the flow to see it is it having trouble sucking water in the inlet fast enough. It's unlikely but I've had it with my domestic water supply pump before.
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Unread 09-30-2001, 02:40 PM   #3
redleader
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Do Eheims even have bearings? I though Magdrive had a single moving part.

I'd email them. There support is pretty good about questions.
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Unread 09-30-2001, 04:21 PM   #4
Nordic
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Thanks for the replies guys!

Bladerunner: Squeezing the pump inlet and outlet result in the same thing -> increased noise. As if it was already cavitating.

redleader: Yeah I'd say their is no bearing to wear out too but I think I chose the wrong word, english not being my native language. In any case you can wear out the impeller as that is what aquarium hobbyists who own magdrives have to replace once in a while, and a tell-tale sign that it needs replacing is that it is getting noisier. That's what I've heard and read ..

What I'm gonna do next is remove the pump from the system and run it in the kitchen sink with nothing attached, I gotta get to the bottom of this issue. I'll get back to this forum in a day or two!
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Unread 10-01-2001, 11:06 AM   #5
gmat
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ARghh no dont panic !
There may be a FAQ about this, BTW. (hint hint, Joe)
There are NO bearings on your pump, trust me.
THe rattling sound you can hear comes from some kind of protection on the impeller against little rocks and solid things you may find inside an aquarium...
Empty your system and take out the pump. Open the impeller chamber.
See that little propeller-like thing ? It can turn relatively to its shaft. There's a pin to limit rotation though (so it flow is not interrupted in the event of a solid thing coming in). This produces the sound you can hear.
Glue the propeller to the shaft. Make sure NO GLUE drops *into* the central part of the shaft (where it's mounted on the axis) or you'll end up with a dead pump.... Cyanolitic or waterproof epoxy can do it. I used Cyano (Super Glue 3) with success.
You'll see, no more noise...
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Unread 10-02-2001, 12:03 AM   #6
UnaClocker
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http://una.procooling.com/impeller Enjoy
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Unread 10-02-2001, 05:23 PM   #7
Nordic
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Guess what Una?! No more noise, did the impeller mod. Thanks a bunch.
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