ASE A3 Manual Drive Train and Axles

26. Technician A says the differential's pinion nut may be loosened to achieve pinion bearing preload. Technician B says to use an inch-pound torque wrench to check the pinion bearing preload. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

26.

Answer A is wrong. The collapsible sleeve can only be torqued once and must be replaced if overtightened.

Answer B is correct. Use an inch-pound torque wrench to check the pinion bearing preload.

Answer C is wrong. Answer B is correct.

Answer D is wrong. Answer B is correct.

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27. A whining sound that increases with vehicle speed is heard after a rear differential overhaul. Which of these could be the cause?

  • A. The spider gears.
  • B. The side bearing preload.
  • C. The side gears.
  • D. None of the above.

27.

Answer A is wrong. Chipped spider gears make noise while turning. This is because while cornering, the outside wheel spins faster than the inside wheel. This causes the spider gears to walk around the side gears.

Answer B is correct. Side bearing preload must be adjusted correctly. Improper adjustment results in premature bearing failure and a whining or growling sound that increases with vehicle speed.

Answer C is wrong. The side and spider gears rotate together with the differential case when the vehicle travels forward in a straight line.

Answer D is wrong. Answer B is correct. Faulty bearings make a growling sound that increases with rotational speed.

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Manual transmission clutch part.

28. Which of the following is true about the part illustrated above?

  • A. It's bolted to the flywheel.
  • B. It has a diaphragm spring.
  • C. It contains friction material.
  • D. It helps dampen engine vibrations.

28.

Answer A is wrong. Pressure plates are bolted to the flywheel. The part in the illustration is a clutch disc, not a pressure plate.

Answer B is wrong. Depressing the fingers of the diaphragm releases the plate, allowing the clutch disc to spin freely.

Answer C is correct. The clutch disc, not the pressure plate, contains friction material. Sandwiched between the flywheel and the pressure plate and splined to the input shaft, the clutch disc transmits power to the vehicle's drivetrain.

Answer D is wrong. Pressure plates help dampen engine vibrations and are usually indexed to the flywheel.

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29. A front-wheel-drive vehicle makes a clicking sound when cornering. Technician A says this could be caused by the axle's (CV) constant velocity joint. Technician B says it's the axle shaft's torsional damper. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

29.

Answer A is correct. Bad or worn CV Joints click while cornering.

Answer B is wrong. The torsional damper will make noise and vibration at higher speeds.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.

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30. The backup lights of a vehicle are inoperative. Technician A says the backup light switch may be stuck closed. Technician B says there could be a loose ground connection. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

30.

Answer A is wrong. A stuck open switch would leave the light circuit inoperative.

Answer B is correct. A loose ground connection would cause an inoperative or intermittent circuit.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

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