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Which adjustment sets base timing on a distributor engine?

  • A.Adjusting the contact breaker gap, which alters the moment at which the points open and therefore the timing
  • B.Moving the pulley
  • C.Adjusting the vacuum capsule, whose adjusting screw alters the base setting as well as the load related advance
  • D.Rotating the distributor body

Answer: D

Slackening the clamp and turning the body advances or retards the whole map. Changing the point gap does shift the timing as a side effect, which makes the second option a real if incorrect method of adjustment. The order in which the effects act is what decides the outcome, so it is worth establishing first. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking which component actually carries the load settles most questions of this kind at once.

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