ASE A3 Manual Drive Train and Axles
6. The shift lever on a manual transmission in a light duty truck is loose and has excessive play in all directions. Which of the following is MOST likely causing this condition?
- A. A worn shift lever bushing.
- B. A worn detent spring.
- C. A bent shift rail.
- D. Loose shift rods.
Answer A is correct. The shift lever bushing is MOST likely at fault. When a shifter bushing is worn the shifter feels loose. This is because the worn bushing has left a gap between the lever and the shift rail.
Answer B is wrong. Check each ball and spring for wear and tension; a weak spring will result in a loose shifter and the transmission jumping out of gear.
Answer C is wrong. The shift rail should slide easily in its bore. It should not have any lateral up and down or side to side movement.
Answer D is wrong. Shift rods are external, shift rails are inside the transmission. Loose shift rods usually require a different bushing that provides a tight fit and smooth movement where the linkage connects.
7. A front wheel drive vehicle makes a growling sound that gets louder as the vehicle turns left. Which of the following is MOST likely correct?
- A. The right front wheel bearing is worn.
- B. The left front wheel bearing is worn.
- C. The right rear wheel bearing is worn.
- D. The left rear wheel bearing is worn.
Answer A is correct. A left hand turn would reveal a bad right side bearing because the weight of the vehicle is focused on that wheel.
Answer B is wrong. A right hand turn would work the left side bearing because the weight of the vehicle is now focused on the left wheel.
Answer C is wrong. Diagnosing wheel bearing noise can be difficult. This is often because the sound they make is so similar to cupped or aggressive tire tread patterns. Each results in a growling noise that increases with vehicle speed.
Answer D is wrong. Answer A is correct, a left hand turn would work the right side bearing.
8. 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.
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.
9. The part illustrated above contains:
- A. A wheel bearing.
- B. A hub.
- C. An ABS tone ring.
- D. All of the above.
Answer A is wrong. All of the above answers are correct.
Answer B is wrong. It’s a picture of a hub and bearing with an ABS tone ring attached.
Answer C is wrong. ABS systems use wheel speed sensor’s to measure wheel speed with the passing teeth of the attached tone or reluctor ring.
Answer D is correct. All of the above answers are correct.
10. Two technicians are discussing faulty CV joints. Technician A says on a front wheel drive vehicle, faulty inboard and outboard axle joints can make noise while traveling forward in a straight line. Technician B says an outboard CV joint's noise is more prominent while cornering. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is wrong. They're both correct, a faulty inboard trunion makes a thunking noise while accelerating and decelerating in a straight line.
Answer B is wrong. A faulty outboard CV joint makes a loud clacking sound while going around corners. A faulty CV joint can also make a clicking or winding sound traveling forward.
Answer C is correct. Both technicians are correct.
Answer D is wrong. Both technicians are correct.