Question 30Motor Plants - QMED

The correct answer is B) clogged sea strainer. A clogged sea strainer is the most likely cause of low raw water supply pressure for a diesel engine cooling system. The sea strainer is responsible for removing debris from the incoming raw water supply, which is essential for maintaining proper flow and pressure to the engine cooling system. If the sea strainer becomes clogged, it will restrict the water flow and result in low pressure, leading to potential overheating issues for the engine. The other options are incorrect because a cracked head (A), broken thermostat (C), or blown head gasket (D) would not directly cause low raw water supply pressure. These issues may impact the cooling system in other ways, but they do not specifically relate to the raw water supply pressure.