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Which temperature limit applies when heating a ring gear?

  • A.Any temperature may be used, since the gear is hardened throughout and cannot therefore be affected by the heating
  • B.Below one hundred degrees
  • C.Above red heat, which is required in order to obtain sufficient expansion to clear the flywheel during the fitting
  • D.Below the point at which the hardening is lost

Answer: D

Overheating anneals the teeth and the gear wears out rapidly, so an even heat well below red is used. Red heat is exactly what must be avoided. An oven or a ring burner gives the even heat required. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist.

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