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Help solve Pump issue - Page 2

post #11 of 21
Thread Starter 
Quote:
Originally Posted by Jakusonfire View Post

Ok, well that is very strange. You will need to dismantle the pump and check the state of the impeller. It should turn freely by hand.

Well, I finally got the pump out of the computer and have been testing. I made a small closed loop on the in and out ports and ran just pure DI water for testing. What I found is exactly what I thought the problem was, the impeller simply stops spinning after about 2-5 seconds from initial power on. With the clear Bitspower pump top, you can see it start to spin for about 2 seconds, then slow down until coming to a near stop. It will spin every now and then, but typically nothing after that initial burst. While the impeller does move by hand and is not locked, it seems like something is causing it to quit.

My next step is to try the pump with the original pump casing and see if it works that way. I know this Bitspower pump top works because I have seen this combo in youtube videos and in the "Dream Machine 2012" Maximum PC build. Koolace as stated prior did have some issues with their pump tops causing trouble, but I find it unlikely this to be the case otherwise others would've known it by now just like with Koolace until they fixed it.
post #12 of 21
Another aspect to take into account is how tight you have the top screwed on. With O Rings, solid contact all around is all that is required. No need to squeeze it completely until the screws won't touch anymore. You could be restricting the impeller from turning freely.
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post #13 of 21
Thread Starter 
Quote:
Originally Posted by Capt Proton View Post

Another aspect to take into account is how tight you have the top screwed on. With O Rings, solid contact all around is all that is required. No need to squeeze it completely until the screws won't touch anymore. You could be restricting the impeller from turning freely.

Yes, that's not it though. I have had the thing apart several times and it is not from that. In fact, I have not seen a case in which anyone over at Swiftech has said it can be too tight to cause an impeller problem. It has to be on solid for a good seal. Also, changing the casing from the Bitspower back to Swiftech original did not help. So, this has got to be a pump issue and others have reported something like this as well. I thought Swiftech or the MCP655 pumps were real good and for the most part they are. But I have found several that have gotten dead or defective pumps which this appears to be.

Going to send back for replacement.
post #14 of 21
Quote:
Originally Posted by HiTekJeff View Post

In fact, I have not seen a case in which anyone over at Swiftech has said it can be too tight to cause an impeller problem. It has to be on solid for a good seal.

That may be so, but I had my own case where I put the top on too tight and interfered with the impeller's rotation, so it can be done.
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post #15 of 21
Thread Starter 
Quote:
Originally Posted by Capt Proton View Post

That may be so, but I had my own case where I put the top on too tight and interfered with the impeller's rotation, so it can be done.

OK, that is good to know just in case. But I did check and in fact it was a bit loose. When I called tech support they said just the opposite and to make sure it was on tight and had a really good seal because that may be a problem. So, too tight, too lose, all I know is no matter what the impeller just spins for a few seconds. If it was too tight, there should be little or no movement at all. When I took it out of the stock Swiftech housing, it was REALLY tight.

Is yours Bitspower mods and resv tube like mine? Just wondering because they said Bitspower is known to work quite well with the Swiftech 655 pumps and hardly ever any issues with that combo.
post #16 of 21
Quote:
Originally Posted by HiTekJeff View Post

OK, that is good to know just in case. But I did check and in fact it was a bit loose. When I called tech support they said just the opposite and to make sure it was on tight and had a really good seal because that may be a problem. So, too tight, too lose, all I know is no matter what the impeller just spins for a few seconds. If it was too tight, there should be little or no movement at all. When I took it out of the stock Swiftech housing, it was REALLY tight.

Is yours Bitspower mods and resv tube like mine? Just wondering because they said Bitspower is known to work quite well with the Swiftech 655 pumps and hardly ever any issues with that combo.

No.
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post #17 of 21
Thread Starter 
Well, I have all but ruled out the pump issue. I got a new 655 PWM replacement and the same thing is going on with it. The only thing it can be now I would assume is the Bitspower pump top mod or the external power supply. Since the power supply works fine with 2 case fans constantly spinning with no drop in power or stopping, I would think that's not the issue here. Must be the pump top mod is not machined properly and is too shallow.

Swiftech said the pump top mod is most likely the case, but they too have seen or heard of very few defective Bitspower brand issues with their pumps. Makes me wonder if there was a bad batch where some did not get drilled properly, but this is a bit rare if so, not to mention there is no word of problems from others with this.

Going to ask support what is known to work for exact part numbers and if I have to replace everything but the pump. That's all I know to do at this point unless anyone has some more thoughts on this problem to check out?
post #18 of 21
Hmmm ... I thought you had said you tested it with the factory top and still had the same problem though?

By the sound of it, and without being able to see it, it nearly has to be the power supply. I can't understand why that would be and have never heard of a supply not running a pump though. I use an old supply to run my D5's while I'm filling the loop all the time without any problems.

Sucks you are having so much trouble with something that you should be able to take for granted ... that your pump will run when switched on.
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post #19 of 21
Thread Starter 
Jakusonfire,

I know what you mean, spent 2 weeks now trying to find out the cause and getting the replacements. Since I sent back the 655-B pump, it has the housing so can't test this one as it's the version with just the pump only. The only thing I can do at this point is eliminate the other two possible causes, the PSU and the pump top mod. Going to try to borrow a friend's PSU and try the pump with it. If that does the same thing, then it has to be the pump top mod is too shallow when machined out I would guess, otherwise, all the other parts have either been checked or replaced.

My best guess is like you, I am using an old Enermax Liberty 500 PSU and did a Google search to see if there were any issues for power like this. What it seems like to me is there is not enough current to power the pump on a constant basis after the initial power on. Thought there may be some sort of automatic power saving mode or cut back if not under a certain load, but can't find anything on this model indicating such. Also, since the 2 case fans stay running and don't spin down I simply don't know at this point.

This is one strange puzzle that I am determined to solve one way or the other.
post #20 of 21
Thread Starter 
SOLVED!

For those reading this thread, I wanted to let others know what the problem was to help troubleshooting in the future. The answer was the PSU causing the problems. I am not sure rather it was a faulty 12V rail or if it was some sort of power saving mode when not under full load, but a different PSU solved the problem I was having. It took me quite a while to track down the cause and even tech support at Swiftech didn't point this out until I specifically asked if it could be the PSU causing the pump impeller problem I was seeing. This is why no matter what I tried, I still had the same problem. It would not have mattered if I got another pump top mod, same or different brand, etc. because the PSU was at fault here.

So, if you have checked your pump, company web sites and seen the same parts you are using working for most others, then chances are it may be the PSU you are testing/priming your system with. Mine is now working perfectly fine just like it should from the start.

Good luck to all.
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