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Which torque practice applies to spark plugs?

  • A.Hand tight only
  • B.Tighten until the plug seats then a further quarter turn, which is the method specified for a taper seat plug
  • C.Tighten to the specified torque with a clean thread
  • D.Tighten as firmly as possible, which ensures that the sealing washer is fully compressed against the head

Answer: C

Overtightening strips the head thread and undertightening lets the plug run hot and blow out. The angle method genuinely is specified for some plugs, which makes the last option a real procedure for a particular type. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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