ASE A3 Manual Drive Train and Axles

26. A differential's collapsible spacer and pinion bearing preload is being discussed. Technician A says the pinion nut may be loosened to achieve pinion bearing preload. Technician B says an inch pound torque wrench is used to check and adjust 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. An inch pound torque wrench is used to check pinion bearing preload.

Answer C is wrong. Answer B is correct.

Answer D is wrong. Answer B is correct.

27. After a rear differential overhaul there’s a whining sound that increases with vehicle speed. Which of the following would cause this condition?

  • 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 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 gears 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.

28. Limited slip differentials have all of the following characteristics EXCEPT:

  • A. Both wheels drive during acceleration.
  • B. Chatter may occur from worn parts.
  • C. They use special fluids.
  • D. Both wheels drive equally while cornering.

28.

Answer A is wrong. This is an except type question. Both wheels drive during acceleration.

Answer B is wrong. Chatter will occur from worn parts.

Answer C is wrong. They use a special additive for smooth lock/release.

Answer D is correct. One wheel is allowed to slip while turning in a vehicle with a limited slip differential.

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 make a clicking sound 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.

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.