Technician A says that diesel engine crankcase vapors are made up primarily of air leaking past the pistons rings and can be vented directly to the atmosphere since it has no hydrocarbon or fuel in the air. Technician B says that crankcase vapors are classified as particulate emissions and are not vented to the atmosphere on late-model engines. Who is correct?

Question

Quizplus · Accepted Answer

Crankcase vapors contain hydrocarbons and other pollutants, and are not vented directly to the atmosphere in late-model engines due to environmental regulations. They are typically routed back into the engine to be burned off.

Technician a Says That Diesel Engine Crankcase Vapors Are Made