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Which practice reduces the risk of seizure on refitting?

  • A.Tightening beyond the specified torque, which ensures that the plug seats fully and therefore cannot corrode
  • B.Fitting dry always
  • C.Applying grease to the sealing washer, which allows the plug to be tightened without galling the face of the head
  • D.A trace of anti-seize on the thread where permitted

Answer: D

A very light anti-seize is permitted by some manufacturers with a reduced torque, while others forbid it. Many plugs are supplied with a plating that makes it unnecessary, which is why fitting dry is genuinely correct for those. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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