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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 04-24-2007
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No circulation

I have a perkins 4.108. I recently rebuilt the whole fresh water system with a new heat exchanger, water pump, hoses etc. Now I can't get the fresh water to circulate. Checked all connections & removed the water pump. I put a garden hose in the system and there is no blockage. I have also removed the thermostat.
Any suggestions?

Last edited by sunrise1; 04-24-2007 at 02:01 PM.
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Old 04-24-2007
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Sunrise...are you getting free flow of water from your sea-**** to impeller. Could be a blockage there. Also...check impeller... remove hose to engine from pump and briefly start engine to see if you are getting pumping out of it.
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Old 04-24-2007
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Sunrise-

Is the problem on the raw water side, or the fresh water, closed loop anti-freeze laden side? Have you tried flushing the heat exchanger? If so, does water pass freely through it?? Does the water pump work?? If it is powered by a pulley and belt off the diesel, have you checked to see that both the pulley and belt are tight?
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Old 04-24-2007
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Thanks for the response.
The problem is on the fresh water side. The heat exchanger is new. The fresh water pump is new. I have removed the fresh water pump twice and put new gaskets each time. I have removed the output hose from the engine that goes thru the water heater to the heat exchanger and connected a garden hose to the hose. I get good flow out of the engine when I turn on the garden hose. So there doesn't seem to any blockage. The thermostat is also removed. I also can't see any leakage of the fresh water in the pan under the engine.
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put the thermostat back in pronto.
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Old 04-24-2007
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Make sure the thermo is not in backwards. And that the water pump spins freely.
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Do you circulate the cooling water through a boiler/calorifier? If so, an air lock in it can ruin your circulation.
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Old 04-24-2007
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How do you see that there is no fresh water/antifreeze circulation? What does it manifest as?
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I removed the hose that goes to the water heater and then start the engine. There should be flow from the nipple where I had disconnected the hose from the water heater. As a result of no water flow the engine overheats in a few minutes.

Last edited by sunrise1; 04-24-2007 at 06:55 PM.
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Old 04-25-2007
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There is probably an air pocket in the cooling system somewhere, is there any coolant bleed points on the engine?
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