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Which component meters the crankcase ventilation flow?

  • A.The oil separator, which removes the oil from the gas and therefore controls the quantity that may pass through
  • B.Nothing
  • C.A pressure regulating valve maintaining a slight depression in the crankcase while limiting the flow admitted
  • D.A calibrated valve or orifice

Answer: D

The valve holds a small crankcase depression and limits the flow so idle is not disturbed. The last option describes exactly that dual function, which makes it a correct and more detailed version of the same answer. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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