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Which additional check applies to a dual mass flywheel?

  • A.The tooth count
  • B.The condition of the springs, which are visible through the inspection holes and may be examined without dismantling
  • C.Free play and rocking movement between the two masses
  • D.The runout of the friction surface, which is the only measurement that can be taken upon such a flywheel

Answer: C

Manufacturers specify a permissible rotational free play and axial rock, beyond which the unit is replaced. The springs are enclosed and cannot be inspected directly. Machining a dual mass flywheel is not permitted. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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