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Urgent MCP655 Problems!!

post #1 of 10
Thread Starter 
Everything was running fine in my computer, and I was just watching a movie when all of a sudden my pump started clicking violently.

I drained the loop and took the pump apart and everything looked fine, there was no evidence of damage or anything in there that could make the noise. When I put it back together it worked fine for a day, then started up again this afternoon.

It is the version with the speed adjustment so I turned it down to make the clicking quieter but it is still pretty annoying. Temps are fine so I know it is working.

Does anybody have any idea what's going on with my pump, or should I be looking at a new one?

Thanks.
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Ace
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post #2 of 10
How old is it? I would RMA if possible
post #3 of 10
Thread Starter 
Quote:
Originally Posted by kevingreenbmx View Post
How old is it? I would RMA if possible
It's ~3-4 years old, I got it used from a buddy of mine so I'm not 100% sure. I've had it for 2 years, but I've only been using it for one. It's been sitting in the box for the rest of the time.
Edited by airplaneman - 1/27/11 at 1:51pm
Ace
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Ace
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post #4 of 10
You said you took it all the way apart? Did you clean everything thoroughly?
post #5 of 10
Thread Starter 
Quote:
Originally Posted by kevingreenbmx View Post
You said you took it all the way apart? Did you clean everything thoroughly?
Well by take apart I mean I unscrewed the outer ring, took off the back part, and the impeller...I didn't see any dirt, I wiped it down with a lint-free rag, but it really was already quite clean.
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Ace
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post #6 of 10
The impeller is probably shot for sure if it's that old. I had the same problem with the variable MCP-655. It's a known problem with the MCP-655 pump series, it can get damaged if you don't prime the pump well enough. It's the whole reason why I was looking at the Rasa kits, their pumps look to be submerged so you don't have to prime them. The worst thing that happens with MCP-655's are that the impeller that moves the water gets damaged and doesn't align with the magnetic pinion anymore. I tried to get in touch with the company who actually manufactures it (because one of their HQ is in my hometown, they wouldn't answer my e-mails) for a replacement impeller but found that the cost of just buying the impeller would exceed the total cost of the pump with an impeller. So it's just best to buy a new pump, the only people that actually sold these impellers were over seas, my quoted price was £57.56 not including shipping.

But make sure you look at the point where the pinion contacts the impeller, if you see any cracks that will cause the impeller to rotate erratically and wobble. If it's cracked there is no way to fix/repair it so you have to buy a new pump.
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post #7 of 10
Did you look at the bearing and see if it was cracked or damaged in any way?
post #8 of 10
Thread Starter 
Quote:
Originally Posted by anoob View Post
The impeller is probably shot for sure if it's that old. I had the same problem with the variable MCP-655. It's a known problem with the MCP-655 pump series, it can get damaged if you don't prime the pump well enough. It's the whole reason why I was looking at the Rasa kits, their pumps look to be submerged so you don't have to prime them. The worst thing that happens with MCP-655's are that the impeller that moves the water gets damaged and doesn't align with the magnetic pinion anymore. I tried to get in touch with the company who actually manufactures it (because one of their HQ is in my hometown, they wouldn't answer my e-mails) for a replacement impeller but found that the cost of just buying the impeller would exceed the total cost of the pump with an impeller. So it's just best to buy a new pump, the only people that actually sold these impellers were over seas, my quoted price was £57.56 not including shipping.

But make sure you look at the point where the pinion contacts the impeller, if you see any cracks that will cause the impeller to rotate erratically and wobble. If it's cracked there is no way to fix/repair it so you have to buy a new pump.
Ah, crap. Thanks for the information dude. Now that you mention it, that little pin/spindle did look a bit worn, that could be it.

Quote:
Originally Posted by kevingreenbmx View Post
Did you look at the bearing and see if it was cracked or damaged in any way?
I didn't take the bearings out (not sure if you can), but from what I saw they were all in place and no obvious cracks.

I think I'm just going to order a new pump...
Ace
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Ace
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post #9 of 10
The Laing pumps of MCP350/355 an the D4/D5/D6 all need some small additive in the loop to keep the white ceramic bearing lubricated to the impeller plastic that rides on top of it.

About 10% propylene gylcol (PG) or Mercon ATF would do the trick in the loop.

Many people today are running with just straight distilled water and a kill coil. Well, that means the pump life of the impeller will be greatly reduced. About 5 years ago and later, many people ran with distilled water and 10-20% green automotive antifreeze. The antifreeze helped lubricate the pump. Well, the green stuff isn't enviromental friendly, but the PG is.
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post #10 of 10
Thread Starter 
Quote:
Originally Posted by bmaverick View Post
The Laing pumps of MCP350/355 an the D4/D5/D6 all need some small additive in the loop to keep the white ceramic bearing lubricated to the impeller plastic that rides on top of it.

About 10% propylene gylcol (PG) or Mercon ATF would do the trick in the loop.

Many people today are running with just straight distilled water and a kill coil. Well, that means the pump life of the impeller will be greatly reduced. About 5 years ago and later, many people ran with distilled water and 10-20% green automotive antifreeze. The antifreeze helped lubricate the pump. Well, the green stuff isn't enviromental friendly, but the PG is.
Thanks for the tip! I remember those days of running anti-freeze in WC loops, back when no one cared how their rigs looked .

Where do you suggest I get propylene glycol or Mercon ATF? I'm currently using PT-Nuke, do I need them both?
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Ace
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