Question 33Motor Plants - QMED

The correct answer is B) excessive wear of the cooling water pump. If the cooling water temperature and the lube oil temperature in a diesel engine are too high, it is likely due to an issue with the cooling water system, specifically the cooling water pump. An excessively worn cooling water pump will not be able to circulate the coolant effectively, leading to overheating of the engine components, including the lube oil. This can cause the cooling water temperature and lube oil temperature to rise above the normal operating range. The other options are incorrect because a dirty lube oil strainer (A) or an oil suction line restriction (C) would primarily affect the lube oil system, not the cooling water system. Internal water leaks (D) could also lead to overheating, but this would typically be accompanied by other symptoms, such as a drop in coolant level.