1988 52C with 4-Cruisair units.
I recently flushed my raw water AC system and I feel that it's pretty clean, not perfect but acceptable for good flow. After a recent strainer change, I had a hard time getting proper water flow. After a couple of attempts, she got going.
1. I took a look at the pumps impeller, I would guess she looks a little worn?
2. Can just the impeller be changed? and is there a source? I do have a back up motor/pump assembly but I would like to keep it as a complete spare.
I apologize for not having the part number, but I left the boat without taking a picture of that.
Thanks,
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06-04-2021 08:27 AM #1Senior Member
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AC raw water pump impeller replacement and source?
Last edited by Eddieclemons; 06-04-2021 at 08:28 AM. Reason: typo
Eddie Clemons Nashville, TN Southern Pride 1988 52CHATCS441K788 2004 Caterpillar 3406e's
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06-04-2021 08:31 AM #2
Re: AC raw water pump impeller replacement and source?
Not sure it's worn beyond salvage. Like a prop with barnacles though, it definitely doesn't have good flow over the blades.
If it was mine I would take it out and work it with a (brass) wire brush on a bench grinder to see if that smooths it up. Or work it with a Dremmel tool wit a small ball shaped grinder bit. Don't take any off the outside edges.
Tough part may well be disassembly.Last edited by oscarvan; 06-04-2021 at 08:34 AM.
1978 53' Motor Yacht "LADY KAY V"
Hull number 524
Chesapeake Bay
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Re: AC raw water pump impeller replacement and source?
The impeller looks eroded to me. It s an oberdorfer relabeled cruisair, call Depco Pump and see if you can get the parts. Personally I d install the spare and rebuild this one
That s why I m not a big fan of these metal impeller pumps. I like of the March impellers can be replaced just by popping the cover, and they rarely fail anywayPascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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06-04-2021 09:31 AM #4
Re: AC raw water pump impeller replacement and source?
The impeller is eroded because of cavitation due to the bubles. There is not much you can do about it. In my case I have the Oberdorfer 104M the impeller/seal/gasket kit is part # 10719. Depco pump have it.Be carefull taking it out because the erosion make the ends very sharp. Good luck
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Re: AC raw water pump impeller replacement and source?
I have the same boat and setup - and my pump runs ok but has a weird vibration, after not being used for a few years, which seems to be getting stronger. So, inevitably it's going to need replacement soon.
I had bookmarked this page for the replacement, but will be curious to see what you do: https://inetmarine.com/March0150-002...mp115Volt.aspxAt the mouth of the Caloosahatchee
1984 52C
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06-04-2021 11:29 AM #6Senior Member
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Re: AC raw water pump impeller replacement and source?
Is the impeller screwed onto the shaft/pump tip I presume? My current those are to try and do an impeller change. If that is not possible, then I would install the complete spare unit I have. Long term the March unit looks nice. Thanks
Eddie Clemons Nashville, TN Southern Pride 1988 52CHATCS441K788 2004 Caterpillar 3406e's
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06-04-2021 11:30 AM #7Senior Member
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Re: AC raw water pump impeller replacement and source?
I agree with Pascal about March pumps, I have two pumps installed in 2003 , here in south Florida, running almost continuously , no problems other than a barnacle growing in a vane , which will disrupt flow quite a bit .
JMooney
61 MY 1983 #341
“Jerrie”
Miami , FL
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Re: AC raw water pump impeller replacement and source?
Soak the impeller in phosphoric acid for 4-5 hours, repeat if necessary. Or, drop it in white vinegar overnight. Stay away from hammers and chisels.
Semper Siesta
Robert Clarkson
ASLAN, 1983 55C #343
Charleston, SC
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06-04-2021 12:51 PM #9
Re: AC raw water pump impeller replacement and source?
I have 3 March pumps running in Fort Myers, and other than cleaning my strainers weekly have not had any issues to speak of. I have the March AC-5MD's, 220V models. In addition to cleaning the strainers weekly, I pull the heads every 3 months and wash them out - Low maintenance by my standards. I recommend Bestbuypumps.com - Reasonable prices, replacement/repair parts, easy ordering and fast shipping.
"A smooth sea never made a skillful sailor"
Rob Waldrop
M/V Pau Hana
Ft Myers FL
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Re: AC raw water pump impeller replacement and source?
Good job on that site - it's about one-forth cheaper than the one I linked. I'll have to check everything to make sure it's the right pump. But for 270 bucks, it's not worth messing around too much with the old pump. Plug and play....
This one, right? https://bestbuypumps.com/AC-5C-MD-11...-0026-0100.htmLast edited by JuiceClark; 06-04-2021 at 08:28 PM.
At the mouth of the Caloosahatchee
1984 52C