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Old 09-14-2022, 12:38 PM
Cpt. Bronze Cpt. Bronze is offline
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Cooling System Blockage?

Model 5411, new to me Catalina '27. I am an amateur sailor as well as mechanic, so I need some hand holding...

When I bought the boat the cooling system was operating fine, with water discharging out the back. After running full throttle for 20-30 min water ceased to flow through the system.

--Pulled the outlet hose from the water pump and confirmed a healthy flow when engine is running, so I know all is well from the sea water inlet to the block.
--Pulled the hose from the thermostat to the exhaust and got zero flow.
--Removed the thermostat entirely and got zero flow.

I therefore assume there is some kind of major blockage happening inside the engine itself. Is there any other explanation? Is it reasonable that a blockage would impede 100% of the water flow?

Assuming I'm correct, what is the best way to clear the obstruction? Can I some how "back flush" by pumping water into the top of the engine and draining at the bottom? I saw a video of a guy doing something similar using an electric drill pump.

Thanks in advance for your thoughts.
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blockage, cooling water stops, flush, water intake

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