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pump starting to go bad?

post #1 of 3
Thread Starter 
hey guys I just recently built a new rig (all stats in my profile) but I used my older pump (swiftech ddc 655) from an old and otherwise long gone rig to save a couple bucks. I have been monitoring flow rates since I set this rig up and I have been at a steady 1.1-1.2 L/min well just the last few weeks it has been steadily decreasing... right now it's fluctuating around 1.0 and 0.8 and has started making an intermittent and high pitch squeak every 5-10 seconds. I have had my new rig for a few months now and have put maybe 3k-ish more hours on the pump and I had it in my old rig (2006) for a year or so, so maybe say 10k hours.

so my question is this a sign that it's time to buck up and buy a new pump?

*edit** I have been monitoring my 12v rail and it's been a steady 12.20v reported by speed fan
post #2 of 3
The Laing pumps should have a run life of 50,000+ hours.

Not knowing your previous loop life and the current one, here's a few things to try out.

- Does the loop have air trapped in it?

- While the pump is running, can it get enough coolant to draw-in? a restrictive inlet will cause squealing and impeller damage over time due to cavitation.

- What is the coolant being used?

- Did you flush all the components prior to the WCing loop build?

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post #3 of 3
While the flow rate could be blockage or something else, the high pitched sound isn't right. I would open it up and look over the PCB for black/burn spots. I had an old DDC a long time ago that would run, but one of the coils wasn't running right and it had really low performance too. It had some black burn spots where one of the FETs had burned up.
    
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CPUMotherboardGraphicsRAM
3930K ASrock X79 Ext7 Evga GTX570 CORSAIR Vengeance 16GB 
Hard DriveOptical DriveOSMonitor
Phoenix SSD+2TB Seagate drives ASUS DVD-RW combo Windows 7 28" Hanns-G HZ281 
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MS Natural Corsair TX650 Danger Den Torture Rack Logitech MX518 
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