Laing D5/MCP655 failure

[kakarlsen]

Hi

Last night my MCP655 started making really bad noises and vibrations. I opened it up:





I assume the impeller got contact with the housing because the white ball or the plastic inside the impeller is worn. Is it possible to get spare parts for this, or is it beyond repair?

[Proximon]

Good question, mine went the same way a few weeks ago. Not sure if it's really possible or not.

[Sparky]

I've never seen any spare parts available anywhere. I don't even know how that bearing is attached actually.

Surprised the ceramic wore like that. I'd expect the plastic in the impeller to wear out first.

[Martinm210]

No, but it's surprising to see. Been watching D5s for probably 7 years now. I can count on my hand how few have had a bearing type failure. It just doesn't happen very often at all.

Possible it is under warranty, if not time to replace it.

[kakarlsen]

After some history digging, I realized it's been up and running since 2006. Not too bad then, or what? Temporarily running with a Hydor L20 I had laying around, but I've already ordered a new D5.

[Vicey]

Since 2006 is quite impressive. I usually replace my pumps every 3 years, you got 8 out of that one!

[Proximon]

Mine was running since march of 2010. I have a theory now about the failure. I think it has to do with pump head. The majority of the water in my loop is way below the pump. I think I will be redesigning the loop this summer with that in mind.

[Sparky]

Well this thread is now serving to tell me to check my pump. I've been running my DDC 3.2 almost 24/7 since winter 2008. 6 years in February! Around 38,000 hours. I forget what the MTBF is one these.

[Wolf132]

This happened to my mcp355 with a xspc res top after 5 years. Walked downstairs for a drink, walked back up, thought my house caught fire cause of the burning smell.


[IMG][/IMG]

[Sparky]

I've seen a lot of dead DDCs with XSPC tops. Not sure what those tops did to those pumps but they didn't seem to get along very well.

I have a Petra top on mine.

[Martinm210]

MTBF is 50,000 hours or 5.7 years running 24/7.

[Sparky]

MTBF is 50,000 hours or 5.7 years running 24/7.

Shoot, my math was way off. That's really embarrassing

That also means I'm past the MTBF on my pump

[Church]

MTBF most often is just widely guesstimated by vendors anyway, as most users will never have access to thorough enough statistics. At least for hard disks is, but i suspect for that to happen in other areas aswell, except maybe enterprise sector with big guys. Some have pumps working past MTBF, others - dying pump in half a year .. average joe users can somewhat estimate only after long time after many many views of users of said models, and even then not as number but as "about pump X users complained a bit less then about pump Y". I'd never rely on vendor claimed MTBF .. it's like choosing fans from vendor's noise and performance numbers in product desc, not by 3rd party tests.

[Makymaco]

But i have seen a lot more dead ddc on the forums than d5 (first time i think)
Perhaps it can be a good idea to make a poll on laing pumps life (ddc < 1 year, ddc <2 years, ddc<5 years, d5<1year, d5<2years, d5<5years...)

[Church]

Imho it's possible that in such poll mostly users that have pumps died will post, not those, that still have them up & running. Even if not, you have no chance to find out ratio of them. As at some point DDCs were more popular choice, ratio of deaths can be biased (also number of forum posts about pump deaths). Better statistics would be RMA numbers for middle to big retail sellers or vendors with at least 100 pumps of each kind sold during at least few years (to count out bad batches), but there is no way you can get your hands on that business sensitive data .. so guesstimate is as good as it gets.

[Sparky]

Personally I'm 1 and 1. I had my first DDC die within 7 months. The warrantied pump has been perfect ever since.

I had one D5 that was DOA (and the RMA was unnecessarily difficult until someone higher up in the company gave the rep a kick in the rear lol). Its replacement was fine.

6 in one hand, half dozen in the other.

[madmaxx]

I've ran my D4s/mcp650s dry before and they still don't look like that!

[SkOrPn]

To the OP, thanks for the pics man. That's is really telling info.

My D5 has ran nearly 24/7 at full speed since about May of 2008. In the last few months I have noticed a squeal, or squeaky sound, very loud with a little bit of crunching sound added in. Then it goes away for a few minutes or several weeks. VERY intermittent sound, but as far as I can tell it is definitely coming from the MCP655. I guess I need to do a flush and fill just to get a good look at the bearing and impeller. I found a impeller brand new on ebay, so maybe that is all that is needed.

I built my loop with the sole purpose of pump health and longevity, so not very pleased that it could be failing considering the level of care I have given it.

[I.nfraR.ed]

I have one of my D5's running from March 2009 24/7 and still doing well, but haven't flushed the system the last year or so.
I plan to move the rig into another case and will clean and redo the loop, so I will have a chance to take a look at the pump as well.