A/C circulating pump

GCHOG

Active Member
Mar 25, 2016
149
Bass River, Viking Marina, South Jersey
Boat Info
2006 Sea Ray 260 Sundancer
Engines
6.2 Bravo III
g'morning all ,, recently been having problems with the A/C water circulating pump on my '06 260 DA. Worked fine a week ago , then this past week it stopped working. Pulled the plastic pump housing apart, cleaned the cover, shaft, removed the magnetic impeller, cleaned the whole inside, etc. . No apparent damage or wear. Lightly lubed the small support shaft, impeller housing, etc. Upon test start up , the unit hums and I can start it by manually spinning the impeller with a screwdriver and it will run. Put it back together and it won't start. Does anyone know of a repair kit for it. The manufacturers label is un-readable. ( forgot to take a pic). Or, is there a better replacement, possibly a mechanical pump rather than the magnet type. Thanks in advance for any help.
 
These pumps require a net positive suction head, meaning that they can lose their prime. There are a few ways to resolve the issue:

1. Go for a ride, with AC on, and the movement of the boat can prime the pump.
2. Disconnect the discharge hose from the pump, turn on the AC so that the pump runs, and see if you get flow.
3. If you have a Sea Flush adapter, you can close the seacock, put the Sea Flush adapter on the strainer, and force water thru the AC pump.

http://www.seaflush.com/

Good luck,

Jaybeaux
 
Make sure the sea strainer is clean - mine was full again the other day.

Also make sure you did not clog the pickup some how - plastic bags are common problem there.
You may need to back flush. The Sea Flush kit can help with that and a vacuum blowing. You can also close the sea cock and take off the hose and put a barbed garden hose adapater in and backflush with city water after opening the sea cock. Then close sea cock reattach and open.

If the system is really clogged you may need to flush the system with Barnacle Buster or Phosphoric Acid (search the forums).

These pumps are really good and are magnetically driven and they do not prime themselves. If you hear it spinning but not moving water it is more than like good. If it seems to be a problem I think they used "March" pumps IIRC.

-Kevin
 
still having a problem with the A/C pump, sometimes it starts, sometimes not. I want to replace it. The manufacturers sticker is unreadable. I don't know if it a 250 gph pump or 500 gph pump. I do know it is 120 volt pump. Here's my question, IF it is a 250 gph pump, would it hurt to replace it with a 500 gph model ? I can find lots of March pumps that will bolt right in, but no sure of the gph .. any thoughts.? thanks.
 
You can always call sea ray support and see what was used on the original build. On the 2005 260 Sea Ray Referenced (948265 A/C COMP, PUMP SEAWATER 115V) as the part but it does not show the volume capacity.

-Kevin
 
My old 300 Sundancer used a 250 GPH pump for what I think was a 9000 BTU unit. I would imagine that a 260 would use about the same.
As far as replacing with a 500 GPH pump: I would probably call the manufacturer of your air conditioner to see if there would be any problem with it.
For starters, I would think the inside diameter of the hoses and coil would be larger on units that call for a 500 GPH pump, but I’m not an AC guy.
 
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A friend of mine just upgraded his AC on his boat and surprisingly the A/C's do not need a lot of flow. The higher flow units seem to be used when one pump is potentially feeding multiple A/C compressors.

-Kevin
 

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