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Which method fits a replacement ring gear?

  • A.Welding it in place
  • B.Freezing the flywheel and warming the gear, which produces the greatest difference in size during the assembly
  • C.Heating it evenly then dropping it onto the flywheel
  • D.Pressing it on cold, which ensures that the interference fit is maintained without any risk of distortion

Answer: C

The gear is heated to expand it, then dropped on and allowed to shrink into place. Cooling the flywheel as well genuinely increases the clearance and is sometimes done, which makes the last option a real refinement of the same method. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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