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post #1 of 24 (permalink) Old 05-16-2020, 11:35 PM - Thread Starter
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D5 Pumps Getting Old and Weak

I have 2x EK Vario D5 pumps in series and they are pumping at less than 0.2 gallon/min combined. When I first assembled my computer they seemed to pump much faster. I tried the following:

-Set from PWM to DC in bios, set to 100%
-Unplugged the PWM wires
-Checked hoses for kinks.
-Removed GPU

Do pumps ever just get old and weak? They are over 3 years old. The motors alone now cost $80. That is about how much I paid for each pump assembly 3 years ago.

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post #2 of 24 (permalink) Old 05-16-2020, 11:44 PM
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Quote: Originally Posted by 0451 View Post
I have 2x EK Vario D5 pumps in series and they are pumping at less than 0.2 gallon/min combined. When I first assembled my computer they seemed to pump much faster. I tried the following:

-Set from PWM to DC in bios, set to 100%
-Unplugged the PWM wires
-Checked hoses for kinks.
-Removed GPU

Do pumps ever just get old and weak? They are over 3 years old. The motors alone now cost $80. That is about how much I paid for each pump assembly 3 years ago.

...could it be s.th. else in your loop affecting flow ? I have 7+ MPC655 D5s running since 2013-14, and no 'slow creeping' loss in performance w/ regular loop maintenance. This doesn't mean they cannot 'decline', but usually, as long as they have plenty of liquids / lubrication, they keep on trucking until they die.

...any unusual noises in your loop as of late ?
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post #3 of 24 (permalink) Old 05-16-2020, 11:51 PM
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Whens the last time you cleaned your blocks ? My old d5 never slowed down when it died it just kinda died all at once.


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post #4 of 24 (permalink) Old 05-16-2020, 11:57 PM - Thread Starter
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Quote: Originally Posted by J7SC View Post
...could it be s.th. else in your loop affecting flow ? I have 7+ MPC655 D5s running since 2013-14, and no 'slow creeping' loss in performance w/ regular loop maintenance. This doesn't mean they cannot 'decline', but usually, as long as they have plenty of liquids / lubrication, they keep on trucking until they die.

...any unusual noises in your loop as of late ?
I have not performed any maintenance until now. I just noticed how slow they were pumping when I placed an inlet tube in a bucket of distilled water and outlet tube in an empty bucket. It was a slow trickle and took over 5 min to fill a gallon. Also, my GPU temp went from low 30s to mid 40s. With that said, I don't think there is any restriction because my radiators still have a copper shine inside. My GPU block looked like a new penny when I cracked it open.

There are no unusual noises. The pumps sound like they always have, from memory. They still ramp up and down when I adjust the PWM. Tomorrow, I will remove one of the pumps and test it without any radiators, then with a single radiator.
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Last edited by 0451; 05-17-2020 at 12:01 AM.
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post #5 of 24 (permalink) Old 05-17-2020, 12:12 AM
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Quote: Originally Posted by 0451 View Post
I have not performed any maintenance until now. I just noticed how slow they were pumping when I placed an inlet tube in a bucket of distilled water and outlet tube in an empty bucket. It was a slow trickle and took over 5 min to fill a gallon. Also, my GPU temp went from low 30s to mid 40s. With that said, I don't think there is any restriction because my radiators still have a copper shine inside. My GPU block looked like a new penny when I cracked it open.

There are no unusual noises. The pumps sound like they always have, from memory. They still ramp up and down when I adjust the PWM. Tomorrow, I will remove one of the pumps and test it without any radiators, then with a single radiator.

...well, you need to get to the bottom of the temp / performance loss

Attached is a pic of a 'dirty' D5...kind of hard to tell, but note the 'blue' buildup, which was also on and in the rotor...this was after several years of running in a complex (1x CPU, 4x GPU) loop...after thorough cleaning, D5 pump is still doing great now (meaning steady temps)


...also, perhaps related:

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post #6 of 24 (permalink) Old 05-17-2020, 03:38 AM
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Quote: Originally Posted by J7SC View Post
...well, you need to get to the bottom of the temp / performance loss

Attached is a pic of a 'dirty' D5...kind of hard to tell, but note the 'blue' buildup, which was also on and in the rotor...this was after several years of running in a complex (1x CPU, 4x GPU) loop...after thorough cleaning, D5 pump is still doing great now (meaning steady temps)


...also, perhaps related:
Thanks for that Video, gave me some tips on how to clean my pumps. Have been having a little trouble with one and realized I had not cleaned out the bearings when I did cleaning. Will do next time and hope it solves any issues still present.

Though DDC version same maintenance applies.

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post #7 of 24 (permalink) Old 05-17-2020, 03:39 PM
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0.2gpm is unusually low for 2x D5's. I have one that 5 years old and it still runs as good as my new D5.
I think there is an other issue that making the flow so flow.

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post #8 of 24 (permalink) Old 05-17-2020, 04:00 PM
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Doubt it's pump related, you might have a blockage somewhere.
Might be time to disassemble your pump and have a look including blocks.

Just to add, i love your profile pic btw

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post #9 of 24 (permalink) Old 05-17-2020, 04:10 PM
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Quote: Originally Posted by Nighthog View Post
Thanks for that Video, gave me some tips on how to clean my pumps. Have been having a little trouble with one and realized I had not cleaned out the bearings when I did cleaning. Will do next time and hope it solves any issues still present.

Though DDC version same maintenance applies.

You're welcome...and coincidentally, a new one from yesterday

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post #10 of 24 (permalink) Old 05-17-2020, 11:38 PM - Thread Starter
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Quote: Originally Posted by Socks keep you warm View Post
Doubt it's pump related, you might have a blockage somewhere.
Might be time to disassemble your pump and have a look including blocks.
https://www.youtube.com/watch?v=vRGS4GJ-NQU

Just to add, i love your profile pic btw
Haha thanks!

Quote: Originally Posted by J7SC View Post
You're welcome...and coincidentally, a new one from yesterday

https://www.youtube.com/watch?v=zNjKBmxK-OE
To both: Thanks, I found the issue. Complete blockage on my EK Supremacy EVO CPU block. Now my pumps are working like new. They filled a gallon water bottle in under 1 minute.

Thanks for the Jayz2Cents videos, but he seems to have a lot of metal problems based on past videos I have seen. I think my problem is more plastic and/or dye related. In any case, I will be flushing with Mayhems part 2 and refilling with Mayhems clear fluid.
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