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Cooling System Check

Skin Fitting and Sea Cock

Valve shut. Valve spindle sheared. Blocked by weed. Plastic bag. Saltwater intake pipe. Can get blocked by fine weed and can be difficult to remove.

Remote Saltwater Strainer

Poor seal allowing air into the system. Blocked filter element.

Saltwater Impeller Pump

Broken impeller. Impeller slipping on its bush. Worn face plate. Defective mechanical seal. Rubber impellers mainly fail because they run dry from one of the above.

Freshwater Header Tank

Faulty pressure cap.

Exhaust Elbow

Water injection port blocked.

Heat Exchanger

Blocked or partially blocked cooling tubes. Failed cooling tubes.