Question 450Motor Plants - Assistant Engineer

The correct answer is B) remove condensation and other liquids from the cylinders. Turning over a main propulsion diesel engine with the cylinder test cocks open allows any condensation or other liquids that may have accumulated in the cylinders to be expelled before starting the engine. This is an important pre-start procedure to ensure the engine starts and operates safely, as the presence of liquids in the cylinders can damage engine components if not removed. The other answer choices are incorrect because they do not represent the primary purpose of this pre-start procedure. Checking the starting system (A), compression (C), or lube oil pressure (D) are important checks, but they are not the main reason for turning over the engine with the test cocks open.