Question 13 OSE02 - Assistant Engineer - OSV

The Correct Answer is C ### Why Option C is Correct: **Engine lubricating oil supply header pressure** is the most critical parameter to check immediately upon starting any combustion engine, including a deck winch drive engine. The lubricating oil system provides a pressurized film of oil between moving parts (such as bearings, pistons, and camshafts) to prevent metal-on-metal contact. If the pressure is insufficient or absent immediately after startup, the critical moving parts will rapidly suffer catastrophic wear and overheating within seconds, leading to immediate engine seizure or severe, irreparable damage. Therefore, confirming adequate oil pressure is the **first** check required to prevent immediate engine damage. ### Why the Other Options Are Incorrect: **A) Fuel oil supply header pressure:** While essential for the engine to run, a temporary delay or fluctuation in fuel pressure will cause the engine to misfire or stop, but it will not cause immediate catastrophic mechanical damage to the internal moving components. The primary concern upon startup is mechanical integrity, not combustion stability. **B) Cylinder jacket water pump discharge pressure:** The cooling water system prevents the engine from overheating, which is a gradual process. If the water pump pressure is low or absent, the engine will overheat over a period of minutes, not seconds. This parameter is crucial but secondary to immediate lubrication needs when preventing instantaneous damage. **D) Deck winch gear oil pump discharge pressure:** This pressure relates to the lubrication of the winch mechanism (the gearbox and drum) itself, not the engine driving the winch. While important for the operation of the cargo handling equipment, it has no bearing on the survival or mechanical integrity of the engine unit.