Question 212Motor Plants - Assistant Engineer

The correct answer is A) oil spray. In a diesel engine, the pistons are typically cooled and lubricated by an oil spray system. An oil pump circulates lubricating oil through drilled passages in the engine block, and this oil is then sprayed directly onto the underside of the pistons. The oil spray helps to dissipate heat from the pistons and also provides lubrication to the piston rings and cylinder walls. The other options are incorrect because: B) oil wick is typically used for lubricating smaller components, not for piston cooling; C) oil control rings help to regulate oil consumption, but do not supply oil directly to the pistons; and D) a drilled passage through the camshaft would not be used for supplying oil directly to the pistons.