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 Catalina 250 Specific Forum
 Bilge pump How's it work?		  New Topic  Topic Locked
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Jim-Jill_Austin_TX
Deckhand

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11 Posts
Initially Posted - 04/26/2006 :  22:51:53  Show Profile
Can someone explain how the manual Bilge pump works...Also, we found a wooden handle that appears to be the right size, can anyone confirm if a wooden handle came with the boat? or help make some sense as to how to use it?
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britinusa
Web Editor

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USA
5404 Posts
Response Posted - 04/26/2006 :  23:01:12  Show Profile  Visit britinusa's Homepage
Welcome to the Forum Jim-n-Jill,
you'll find several posts about the manual bilge pump.
The most notable thing is the location of the hose that is supposed to be in the watery area of the bilge.
In the water ballast model, it (the tube) is laying around in the bilge under that plate that is behind (astern) of the cabin steps.
Unless the hose is pointing down (which it will not do naturally) then you can only pump out when you have about 2" plus of ogin in the boat.
I put a piece of velcro around the tube on Joint Decision and then stuck it to the front of that bilge area pointing down. Works a treat.
On our boat (June 2005) there was a metal tube with rubber handle grip that you stick into the pump which is on the side of the port stern round down. Jerk the pump and water will gush out, what more can you say.

What is the year and model of your boat.

Paul
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frankr
Captain

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256 Posts
Response Posted - 04/27/2006 :  07:05:45  Show Profile
My 2003 also has a metal handle with a rubber grip. Maybe the PO lost the handle and that's why you have a stick now. Like Paul said - insert the rod (stick in your case) into the port side opening near the stern and pump up and down. Enjoy your boat and the forum.
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Jim-Jill_Austin_TX
Deckhand

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11 Posts
Response Posted - 04/27/2006 :  08:22:30  Show Profile
We have a 1996 C250 WB...So the access to the bilge area is under a plate behind (astern) the cabin steps? I'll check for that. We have seen the metal version with the rubber handle in the catalog, but only have a wooden-like plunger looking thing...I'll try it.
Edited by - Jim-Jill_Austin_TX on 04/27/2006 08:23:31
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OLarryR
Master Marine Consultant

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USA
3440 Posts
Response Posted - 04/27/2006 :  12:09:27  Show Profile  Visit OLarryR's Homepage
I also have a short metal tube/handle with a rubber grip.

i have never used the bilge pump but am sort of familiar with diaphragm valves. The bilge pump is sort of a combination between a diaphragm valve and a toilet bowl plunger. One stroke of the hnadle pulls a vacuum on the water. So, if the hose in the bilge is not completely submerged, the bilge pump will not pull a vacuum and water will not flow into and thru the bilge pump. When water does pass thru the bilge pump, continued working of the bilge pump handle has water discharging from the pump and subsequently pulling more water from the bilge. The diaphragm construction is either of a nature that it closes off the downstream side on one of the strokes so that the water does not go back out thru the inlet or the valve has a check valve feature to prevent the water from going back out the inlet. I have not really studied the Catalina's Bilge Pump arrangement (or opened it up) to determine which type of method is emplyed to prevent backflow. The thing is that if the bilge was significantly above the waterline, then it would potential be possible that once water completely filled the hose on inlet and discharge ends, the hose would then act as a siphon and water would flow freely out. But the bilge is basicaly at same level or actually below the waterline, so...no siphon effect is possible and that means someone has to continually man the bilge pump if you have a lot of water present or leaking into in the bilge.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.