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Which hazard accompanies removing a seized glow plug?

  • A.Electric shock
  • B.The threads may be stripped, which is easily repaired by fitting an insert of the appropriate size into the head
  • C.The plug may break off in the cylinder head
  • D.The plug may be ejected under compression, which occurs if the engine is turned while the plug is loosened

Answer: C

Carbon seizes the plug in the head and the thin body snaps, leaving a difficult extraction with the head often needing removal. Thread repair is genuinely sometimes required as well. Penetrating fluid and a warm engine reduce the risk. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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