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Which component prevents engagement before synchronisation is complete?

  • A.The detent spring, which holds the sleeve in the neutral position until sufficient force is applied by the driver
  • B.The selector fork
  • C.The interlock, which prevents two gears from being selected at the same time and therefore delays the engagement
  • D.The blocker or baulk ring

Answer: D

The baulk ring is indexed so that its dog teeth are misaligned with those of the sleeve while a speed difference persists, physically blocking the sleeve until the cone has done its work. Once synchronised the ring rotates slightly and the teeth align. Forcing the lever defeats the mechanism and causes the characteristic crunch. Checking which component actually carries the load settles most questions of this kind at once.

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