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Which caution applies to smoke testing?

  • A.The engine must be running, which draws the smoke through the system and therefore reveals the leak more readily
  • B.None
  • C.A pressure of only a few millibar is used, since the inlet manifold is not designed to withstand any internal pressure
  • D.The pressure must be very low to avoid damaging seals

Answer: D

A few millibar is sufficient and higher pressures blow out gaskets and seals. The last option states that limit explicitly, which makes it a correct and more precise version. The engine is stopped during the test. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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