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Which repair addresses a stripped spark plug thread?

  • A.A thread insert fitted into the head
  • B.Replacement of the cylinder head, which is the only reliable repair for a damaged spark plug thread in aluminium
  • C.A larger plug
  • D.An oversize plug fitted with a self tapping thread, which cuts a new thread as it is installed into the head

Answer: A

Helical or solid inserts restore the thread without removing the head on many engines. Oversize self tapping plugs genuinely exist as a repair, which makes the last option a real product rather than an invention. Checking which component actually carries the load settles most questions of this kind at once. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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