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Which combination accelerates intake fouling?

  • A.Recirculation alone, which produces dry soot that passes through the intake without adhering to any surface
  • B.Nothing
  • C.Soot from the recirculation meeting oil vapour from the breather, which binds the particles into a tarry layer
  • D.Heavy recirculation with crankcase ventilation oil mist

Answer: D

Soot and oil mist together are what create the deposit. The last option explains exactly that combination, which makes it a correct and more instructive version. Oil separators reduce it. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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