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Pump ran without water for a couple seconds, now takes 3 seconds to start and whines - should I get rid of it?

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a b K Overclocking
May 19, 2013 12:49:14 AM

Heya Tom's!

I made a couple stupid errors while putting together my loop, and am now worried about my pump. My watercooling setup consists of a number of things, but the important part is that it only runs on the CPU, and is powered by an Apogee Drive II. The very important part is this:

When putting it together, I made a noob mistake and forgot to factor in the fact that the socket on the z77e-itx is very close to the PCI slot. I get everything installed, go to put in the graphics card, and what do you know, the pci slot is blocked. After cursing for a while, I undo a few hours of work, drain the loop, and re-tube it with the apogee turned ninety degrees.

After re-tubing, I fill the loop again, but make another idiot mistake, and don't fill the slightly curved tube leading up to the pump. I cycle the power supply and it takes about three seconds before I realize the pump is running dry and frantically turn it off.

After this point, I was very worried about it; the pump would struggle to start, and one time didn't start at all. Now that the system is back together, I think that it's okay, because it starts reliably in about three seconds when the system gets powered, which I believe is just it getting power. However, it's emitting a very high-pitched, very annoying whine.

Have I damaged my pump by letting it run for three seconds with no water? I know it's very bad to do, but I don't know if it caused a problem.

Does anyone have experience with this pump? Is the whine normal, or something I need to address? I don't think it was there before my error, so is it a sign of damage? If not, can I fix it?

If the answers to any of the above are bad, should / can I return the pump, do you think?
a c 176 K Overclocking
May 19, 2013 3:20:02 AM

Hmm...
I think you'l be fine. While running a pump dry isn't good, I don't think it could have killed itself within a few seconds.
Vibration and whining I have found is an inherent property of water-cooling pumps, even in the ideal circumstance where you can decouple it from where its mounted. Unless its really bad, wouldn't think its anything out of the usual.
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a c 103 K Overclocking
May 19, 2013 10:45:28 AM

Very possible you haven't bled your loop fully. Manochalk is dead on as usual. A few seconds shouldn't have killed it. Shortened life span, yes but unlikely it killed it. Rotate your case around a re bleed it first. One or 2 drops of Dawn ddish soap helps as a surficant to get micro bubbles moving. You would be surprised how much noise can be caused by just a few microbubbles in the pump
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a b K Overclocking
May 19, 2013 3:33:21 PM

You guys are right that I haven't bled my loop fully yet; glad to hear that's what's likely to be causing the issues! When I've got my computer back up, I'll bleed the loop fully and see how much that helps.

As for the Dawn, I was hoping to keep my loop completely clean; distilled water and a silver kill coil. What are the downsides of using the soap?
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a c 103 K Overclocking
May 19, 2013 4:06:13 PM

One or 2 drops has no drawback. More is not better! It simply serves as a surficant to eliminate sports are can attach to. Microbubble build up is cause by microscopic grooves, pits etc present in normal manufacturing. Smooth is not if you look close enough
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a c 103 K Overclocking
May 19, 2013 4:17:40 PM

If you still have a fair amount of air in your system, depending on your setup of course, leaving your fill port open while running and adding fluid can help. Otherwise, the pressure build up can prevent air bubb from freeing up and moving into the res
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a b K Overclocking
May 19, 2013 7:36:06 PM

Running with the fill port open, will do my best to completely bleed the system and get back to you guys tomorrow. Thanks for all the help!
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a c 176 K Overclocking
May 19, 2013 10:45:50 PM

When bleeding my loop, I just kept turning it on and off and shaking the case continuously until the worst of the bubbles are out. From there you just leave it running for a bit and that will get out whats left. Running the pump with the reservoir fill cap on and off makes a difference from what I have seen, just change it every other time you turn the rig on.
Then youv only got micro-bubbles to deal with, but nothing can be done about them except leaving it for a few days and topping the res later.
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a b K Overclocking
May 20, 2013 7:15:32 PM

So I finally worked up the balls to try the soap thing - I think I put a little too much in because I have a few bubbles on top, but holy COW, that was INSTANT. Micro bubbles are all going away now.

Thanks for all your help, both of you!
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a c 103 K Overclocking
May 21, 2013 7:35:29 AM

I said one drop lmao! It is likely too that once the soap works thru the system rather than concentrated in theres those lil bubbles should go bye bye. Glad to hear Iit worked out for ya :) 
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a b K Overclocking
May 22, 2013 1:29:22 AM

I only put a couple drops in; the bubbles turned out to mostly be due to turbulence - topped up my reservoir a bit and they went away. I still get microbubbles swirling around in my reservoir, and therefore, I presume, my line.

It'll give that high pitched whine for an hour or so after the system turns on, and then it fades. (Or I get used to it - not sure which. :p )
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a c 103 K Overclocking
May 22, 2013 9:04:48 AM

Did you do as manochalk suggested and flip your case around a bit while cycling pump? Air rises. Sometime it needs encouragement and a path opened.
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a b K Overclocking
May 22, 2013 1:50:05 PM

Yep, but I'll continue to do so.
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a c 103 K Overclocking
May 22, 2013 2:23:22 PM

I wouldnt worry too much at this point if you are confident majority is out. The micros will take time to work out. Be patient. I've seen liquid systems clear in a day, some in a week
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