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Which check confirms that a rebuilt final drive is correct?

  • A.A measurement of the fuel consumption over a fixed distance, which reveals whether the efficiency is as expected
  • B.A road test listening for noise on drive and overrun
  • C.A measurement of the oil temperature after an hour of running, which indicates whether the preload has been set correctly
  • D.A visual inspection only

Answer: B

Listening on a steady throttle, on the overrun and on a trailing throttle at a range of speeds reveals whether the setting is correct. Temperature is a useful secondary check. A noise appearing on one condition only points directly to the flank at fault. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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