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post #1 of 18 Old 10-12-2013 Thread Starter
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Replacing Engine Driven Water pump with electric

Has anyone documented the variation in water flow from 2000 RPM to 4000 RPM on a Sailboat engine? If i replace the mechanically driven pump with an electrically driven pump tied directly to alternator (only running when the engine is) What flow should i be looking for? Yamnar 2QM15 in the new motor I am looking at dropping into my 30 hunter

Thank you in advance for your assistance

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post #2 of 18 Old 10-12-2013
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Re: Replacing Engine Driven Water pump with electric

I thnk most people will say "DON"T!" My own thoughts are that 12 volt motors can't run continuously for hours and hours. The water flow varies with the heat increase as the engine speed increases. I think it's around 5 gals a min, don't know actually. The Yanmar will have it's own pump, so I wonder why your thinking you want electric for the pump. Is it for the engine coolant, or the sea water?

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post #3 of 18 Old 10-12-2013 Thread Starter
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Re: Replacing Engine Driven Water pump with electric

When I got the engine, the water pump pulley is not there. so I need to find either a new pump or a pulley that will work. New Pump is $400, Electric Pump is $125 Was just trying to think outside of the Yanmar Box

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post #4 of 18 Old 10-12-2013
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Re: Replacing Engine Driven Water pump with electric

I've seen it done especially on gensets or where there were originally multiple pumps. There's no reason it won't work in theory. Most electric pumps are not designed to be run continuously. Those that are can be expensive. Only an example. The little Johnson pump on my refrigerator pumps 1.6L minute and costs about $250.
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Re: Replacing Engine Driven Water pump with electric

a mechanical pump is simple and will last for a decade, it should be the 1st choice IMHO..
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Re: Replacing Engine Driven Water pump with electric

Agree with above...If you have an electrical problem you now also have an engine problem...most diesel engines will run without electricity but not without cooling...
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Re: Replacing Engine Driven Water pump with electric

if you can get the dimensions of the pulley, you can probably have one made for less than 400

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Re: Replacing Engine Driven Water pump with electric

Find out what tractor that engine goes in. for example.
John Deere 332 Tractor Yanmar 3TN66UJ 18HP Diesel Engine Water Pump Pulley | eBay

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post #9 of 18 Old 10-12-2013
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Re: Replacing Engine Driven Water pump with electric

Quote:
Originally Posted by svinshallah View Post
There's no reason it won't work in theory. Most electric pumps are not designed to be run continuously. Those that are can be expensive. Only an example. The little Johnson pump on my refrigerator pumps 1.6L minute and costs about $250.
I think I'll call my next boat "In Theory" .... cause' "in theory" everything works.
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post #10 of 18 Old 10-12-2013
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Re: Replacing Engine Driven Water pump with electric

Ask around boat yards they may have one used off a blown engine.
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