Question 234Motor Plants - Assistant Engineer

The correct answer is C) The oil pressure is greater than the cooling water pressure. In a main diesel engine oil cooler, the oil pressure is typically greater than the cooling water pressure. This is because the oil pump, which circulates the engine oil, generates a higher pressure than the cooling water pump. The higher oil pressure ensures that the oil flows through the oil cooler effectively, allowing the engine oil to be cooled by the lower-pressure cooling water. The other options are incorrect: A) is false because the oil temperature is higher than the cooling water temperature, and B) and D) are not correct principles for how a main diesel engine oil cooler functions.