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Old 05-06-2018, 02:08   #1
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flushing fresh water cooled engine

My engine (kubota) is fresh water cooled.

I would like to flush it to get out all the deposits.

What do people recommend to flush out scaling, etc ?


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Old 05-06-2018, 04:12   #2
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Re: flushing fresh water cooled engine

When you say "fresh water cooled" I think you mean antifreeze in the closed cooling loop, and a heat exchanger system for cooling the coolant.

Which means two parts to flush. Our engine manufacturer recommends their own product for flushing the closed coolant system. Happens to be Cummins Restore, and our service manual has directions (mostly drain old coolant, fill with Restore, run it for a bit, drain the Restore, fill with new coolant).

The second part is the raw water passageways, heat exchanger, etc. Two products marketed for this purpose are Rydlyme and Barnacle Buster, and there may be others. One method is to fill/wait/drain, and another is to recirculate, latter said to be more effective.

In your case, probably useful to learn about any restrictions Kubota may publish...

I used Rydlyme on our engines, one each method, and on our genset, 2nd method, didn't see much difference. I've used Barnacle Buster on our ACs, first method, seemed to work. Recirculation in this case would be a major pain, 'cause catching the outflow isn't easy when our boat is in the water.

Selby Bay, South River, Chesapeake Bay, USA.
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Old 05-06-2018, 04:39   #3
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flushing fresh water cooled engine

I installed a Prestone flush kit inline with the hose going to the water heater, just like you do on an auto heater hose.
Connect garden hose, flush until water is clear, drain and refill with antifreeze and water mix
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