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XD3 rattle/noise


kwblue
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I just completed my custom loop with the XD3 as the pump/reservoir and have been in the process of doing a leak test with fluid and with the pump running (already checked air leaks).  Currently, only the pump is hooked up via molex to power with PWM disconnected.

What I am seeing though makes me wonder if there is something wrong with this pump.  There is a large constant rattle that almost sounds like a metal scraping that is present.  At first I thought that it might be an air bubble in the pump, but after running all night, the sound remains unchanged.  It has persisted even after tilting the case.  When the PWM cable is connected, in theory the pump should run at 60% and it would possibly not be as loud, but on the contrary, it is the same, if not louder.  In fact, the only time that the sound is not present is a brief half second when starting to tilt the case backwards, but it quickly returns no matter the case orientation.  The sound is definitely coming from the pump and do not see anywhere that the pump is vibrating against anything.

I do not believe there is air trapped in the pump as I would have expected it to be purged by now from running overnight.  The only other possible explanation not involving mechanical/structural fault in the pump/res combo may be some back pressure from the T junction to a drain valve shortly after the outlet from the pump; normal flow with the drain valve closed is to take a right angle turn into the GPU block.  But to test this theory I would need to drain the loop and reorient things to which I might just change courses anyways and switch to a D5 pump (the XD5 might fit but there is one location it could fit and it is questionable if there is space, otherwise would probably be looking at another brand).

https://imgur.com/a/mIBICXm

Thoughts?

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The quick start guide states something that may be of importance :

It is mandatory to use the front-left port as the OUTLET. The recommended INLET (return) port is marked
on the image below. Optionally, you can use the top G1/4 port as an INLET

https://www.corsair.com/corsairmedia/sys_master/productcontent/HXS_XD3_RGB_QSG_49_002027_revAB.pdf

 

 

That could explain a lot if the pump is struggling to bleed air since the water flow isn't ideal

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6 minutes ago, LeDoyen said:

The quick start guide states something that may be of importance :

It is mandatory to use the front-left port as the OUTLET. The recommended INLET (return) port is marked
on the image below. Optionally, you can use the top G1/4 port as an INLET

https://www.corsair.com/corsairmedia/sys_master/productcontent/HXS_XD3_RGB_QSG_49_002027_revAB.pdf

 

 

That could explain a lot if the pump is struggling to bleed air since the water flow isn't ideal

I do not believe this to be the case.  I have read in multiple places that this is a known bug in their documentation.  And if you notice, Figure 3 in the referenced manual shows both the front left as well as the left side ports being listed as outlet ports which is actually correct, but contradictory to Figure 1 and the written step #2.  And I can confirm that indeed flow is occurring as connected to the left side port.

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The XD3 is pretty loud at 100%, but that is not the sound it should make. If I could only hear and not see, I would guess a blockage or closed valve. It certainly has that tone. However, the video appears to show flow. The XD3 is pretty violent at max and the bubbles would have been unmistakably shooting through the loop on the first start. If you can confirm flow, then it would seem their is a pump motor issue. 
 

The DDC pump will not revert back to a lower % (from 100%) unless you power down and restart things. It will stay at 100% and I strongly recommend you not hot plug any of the Corsair units. You can take out the PWM function of the pump or the Commander or both. However, that is more FYI for future use. The sound is still wrong at 100%. 

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17 minutes ago, c-attack said:

The XD3 is pretty loud at 100%, but that is not the sound it should make. If I could only hear and not see, I would guess a blockage or closed valve. It certainly has that tone. However, the video appears to show flow. The XD3 is pretty violent at max and the bubbles would have been unmistakably shooting through the loop on the first start. If you can confirm flow, then it would seem their is a pump motor issue. 
 

The DDC pump will not revert back to a lower % (from 100%) unless you power down and restart things. It will stay at 100% and I strongly recommend you not hot plug any of the Corsair units. You can take out the PWM function of the pump or the Commander or both. However, that is more FYI for future use. The sound is still wrong at 100%. 

Thanks for confirming my suspicions.  I have a support ticket open though haven't yet heard a reply back.

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Just going to close on this: Got a response to the support ticket and got a confirmation that the pump is faulty.  I have already initiated a return through the original seller and gotten a replacement from a local retailer.  I appreciate the responses and help from the community.  Thanks.

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