If you have a supply of cooling water, put a 5 gallon bucket in the boat and put a hose in it. Then put the raw water pickup into the bucket. Fill the bucket and start the engine. Adjust the hose to replace the water the engine draws up and let it run as long as you want. When you are ready to shut down, run a few gallons of pink anti-freeze through the cooling system then shut the engine down.
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