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Left water pump on with no water

post #1 of 9
Thread Starter 
Hello fellow OCNers!

Quick question. I tried to search this first but couldn't find any definitive answers so I thought I'd ask here.

I performed cable management last night to make room for my new loop I'm about to install. Just waiting on the radiator. I decided to mount the water pump while I was at it since that was the reason I was cleaning up the wires. While managing all the cables behind my motherboard, I got plug happy and plugged everything in. I ran my PC for about 5 hours since that time when I realized a weird humming noise. When I went to investigate I realized my MCP-655 was running at full blast on air. Did I damage my pump or do you think it is ok? It doesn't sound blown out but I don't know if they require the restriction of water passing though to run at their specifications. Just wondering if I have to order a new pump now. Any help would be greatly appreciated. Thank you very much for your time!
post #2 of 9
Quote:
Originally Posted by pali View Post
Hello fellow OCNers!

Quick question. I tried to search this first but couldn't find any definitive answers so I thought I'd ask here.

I performed cable management last night to make room for my new loop I'm about to install. Just waiting on the radiator. I decided to mount the water pump while I was at it since that was the reason I was cleaning up the wires. While managing all the cables behind my motherboard, I got plug happy and plugged everything in. I ran my PC for about 5 hours since that time when I realized a weird humming noise. When I went to investigate I realized my MCP-655 was running at full blast on air. Did I damage my pump or do you think it is ok? It doesn't sound blown out but I don't know if they require the restriction of water passing though to run at their specifications. Just wondering if I have to order a new pump now. Any help would be greatly appreciated. Thank you very much for your time!
Generally that will fry a pump, but if it's still working then you may have gotten lucky. I'd try running it with some water and see what happens, but be prepared to see that you may have burned it out.
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post #3 of 9
You may have shortened its life (since its still working) / hurt the warranty.

On my 355 pump instructions it said in bold do not turn on in air, not even just to test.
    
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post #4 of 9
Yeah the pump is water cooled so may be burned up even though it still spins.

Hope not though for your sake.
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post #5 of 9
Thread Starter 
Well I just hooked it up to a big bottle of water. It did want to pull the water up out of the bottle and spray it out. Shouldn't it be able to? But when I gravity fed the pump it seems to be working ok. I do get a humming. I think thats what happened to it. I think I shortened the life span. I didn't notice it was plugged in until I heard the humming. So I'm thinking it might be half way out the door
post #6 of 9
Quote:
Originally Posted by pali View Post
Well I just hooked it up to a big bottle of water. It did want to pull the water up out of the bottle and spray it out. Shouldn't it be able to? But when I gravity fed the pump it seems to be working ok. I do get a humming. I think thats what happened to it. I think I shortened the life span. I didn't notice it was plugged in until I heard the humming. So I'm thinking it might be half way out the door
Rule number one is always gravity feed these pumps even if it's by a fraction of an inch. They won't prime themselves, so an airlock like that is not going to do anything except damage.

It sounds like it's working fine, but don't play with fire here, just set it up witha gravity feed and see. If it works then you're set. D5's generally run cooler than the DDC's so it's possible that you got lucky here.
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post #7 of 9
Thread Starter 
Quote:
Originally Posted by SaltwaterCooled View Post
Rule number one is always gravity feed these pumps even if it's by a fraction of an inch. They won't prime themselves, so an airlock like that is not going to do anything except damage.

It sounds like it's working fine, but don't play with fire here, just set it up witha gravity feed and see. If it works then you're set. D5's generally run cooler than the DDC's so it's possible that you got lucky here.
I think you are right. I did get lucky. Luckily, my case inside runs very cold since I have a lot of large fans and a cold room. 65f in here. When you put your hand in my case it is very cold. Can't even feel any heat when touching the CPU heatsink. I didn't realize they don't prime themselves. I know you are supposed to gravity feed them but I guess I assumed it was powerful and could just pick water up. Thank you very much for your input!

P.S. That is an awesome modified 800D!
Edited by pali - 3/12/11 at 10:00am
post #8 of 9
Quote:
Originally Posted by pali View Post
I think you are right. I did get lucky. Luckily, my case inside runs very cold since I have a lot of large fans and a cold room. 65f in here. When you put your hand in my case it is very cold. Can't even feel any heat when touching the CPU heatsink. I didn't realize they don't prime themselves. I know you are supposed to gravity feed them but I guess I assumed it was powerful and could just pick water up. Thank you very much for your input!

P.S. That is an awesome modified 800D!
Thanks, I like the case and the mod, though I'm debating selling it and starting a new project...

They can't prime themselves because the water is so much more dense and is heavier, so it can't compress the air enough to lift it up. There are two concerns with running the pump dry, the lack of restriction over-revving the motor and burning it out through heat, or the ceramic bearing not being lubricated and cooled by the water. You may have damaged the pump, but if it isn't grinding and it seems to be functional then I'd say you got lucky.
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post #9 of 9
Is it loud when it's pumping water?
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