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Which precaution applies before dismantling any unfamiliar assembly?

  • A.Remove the largest fastener first
  • B.Mark every component with a punch so that the assembly may be reconstructed in its original configuration afterwards
  • C.Consult the manual and note the original settings
  • D.Apply penetrating oil to every fastener and leave it overnight, which guarantees that nothing will be damaged

Answer: C

Recording backlash, shim thicknesses, bearing preloads and component orientation before dismantling saves a great deal of time and often makes the difference between success and failure. Marking components is genuinely valuable and is standard practice, so the last option describes part of the same discipline. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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