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MCP35X constant wheezing noise

post #1 of 6
Thread Starter 
I have a MCP35X pump mounted on the back of a dual bay reservoir. The whole setup ran entirely fine for 1+ year (with the first pump) but then, it started to make a constant wheezing noise.
I took the whole thing down and opened the pump (already been 1+ year so warranty had elapsed), I noticed that it had some black stuff around.

Examining it very closely, the problem seemed to come from the impeller/rotor that sits on the ceramic bearing.
It looks like the ceramic bearing actually wore down onto the graphite (hence the black stuff), making an uneven rotation of the impeller, leading to a constant wheezing noise.
After researching it a bit, the most likely cause for this would be running a pump dry.
However, my loop has always been properly filled and the pump correctly fed with water so I'm certain it never went dry.

Anyway, I bought a second MCP35X a few months ago and it ran fine until recently, showing the exact same symptoms.
I haven't checked the internals yet but I'm fairly certain it is the same issue. Now I'm really wondering if something in my setup might be leading to such a problem.

The pump is mounted on the back of a dual bay reservoir with the outlet pointing up.
Loop is res->pump->rad->gpu (sli)->rad->cpu->res

Any ideas anyone ?
post #2 of 6
What bay reservoir?
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Big Lian Li
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Forever Alone
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post #3 of 6
Thread Starter 
It is a FrozenQ Liquid Dual Bay res

IMG_20120705_013358.jpg
IMG_20120705_013342.jpg

At first I thought that I had tightened the screws too tight, compressing the impeller onto the ceramic bearing.
However, for the 2nd pump, I made sure not to tighten too much.
post #4 of 6
Wheezing is caused by broncho-constriction, get out the albuterol and give it one dose, wait 5 minutes and if wheezing persists give it another dose. If symptoms don't subside after three doses contact an emergency medical services.

All bad asthma jokes aside, what kind of flowrates are you getting? If you're getting low flow rates at higher RPMs it might not be an issue with the pump, but an issue with the loop over stressing the pump. With your current setup I doubt the loop's restriction in of itself could be over-stressing the loop, but if there's some kind of buildup or restriction it could be that. If you're getting normal flowrates I'd RMA your pump assuming you didn't open the second one already, and try mounting the pump off of the res. Bay reservoirs are really difficult to bleed, and excessive air bubbles through a pump can cause the same effect as running it dry.
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by ZytheEKS View Post

Wheezing is caused by broncho-constriction, get out the albuterol and give it one dose, wait 5 minutes and if wheezing persists give it another dose. If symptoms don't subside after three doses contact an emergency medical services.

All bad asthma jokes aside, what kind of flowrates are you getting? If you're getting low flow rates at higher RPMs it might not be an issue with the pump, but an issue with the loop over stressing the pump. With your current setup I doubt the loop's restriction in of itself could be over-stressing the loop, but if there's some kind of buildup or restriction it could be that. If you're getting normal flowrates I'd RMA your pump assuming you didn't open the second one already, and try mounting the pump off of the res. Bay reservoirs are really difficult to bleed, and excessive air bubbles through a pump can cause the same effect as running it dry.

Thank you for your input.
Flow rate indeed seems a little bit low: when I look at the reservoir, I don't see much of turbulence.
Back when I was planning my loop, I made sure the whole setup was not too restrictive. I might have miscalculated then ?
How do I know how much flowrate I have without any flow-meter ?
post #6 of 6
Quote:
Originally Posted by Gauvi View Post

Thank you for your input.
Flow rate indeed seems a little bit low: when I look at the reservoir, I don't see much of turbulence.
Back when I was planning my loop, I made sure the whole setup was not too restrictive. I might have miscalculated then ?
How do I know how much flowrate I have without any flow-meter ?

Without a flow monitor you'll have to just eyeball it. Again, I don't think your loop should be restrictive enough to mess with the pump. I would recommend tearing it down, and opening up the water blocks. My bet is there's some crap in one of them blocking flow, making it EXTREMELY restrictive.

I'd recommend getting a flow monitor and liquid temp monitor during the teardown, makes planning loop expansions a ton easier and helps knowing if you need more rad if you're having thermal issues.
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The Laboratory
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