In Marine Engines, which sequence best describes the coolant flow in a heat exchange cooling system after leaving the expansion tank?
Around cores, to oil cooler, to engine coolant pump inlet
In a marine heat-exchanger cooling system the closed engine coolant is pushed round its loop by the engine coolant pump, and it gives up its heat to raw water in the heat exchanger cores.
Following the circuit after the expansion tank, the coolant is directed around the cooling cores where it is cooled, then passes through the oil cooler to carry heat away from the lubricating oil.
From the oil cooler the cooled coolant returns to the inlet of the engine coolant pump, which drives it back through the engine to complete the closed loop.
So the correct order after the expansion tank is: around the cores, to the oil cooler, then to the engine coolant pump inlet.
Hence, the answer is Around cores, to oil cooler, to engine coolant pump inlet.
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