NAPA - National Automotive Parts Association Certified Mechanic Manual Drivetrain and Axles Questions and Answers

Question 1

A customer with a manual transmission vehicle complains of a high-pitched squealing noise that occurs only when the clutch pedal is fully depressed.
The noise disappears as soon as the pedal is released.
What is the MOST likely cause?

Accepted Answer

Worn throwout (release) bearing

Answer

Worn pilot bearing

Answer

Slipping clutch disc

Answer

A leaking clutch master cylinder

Question 2

A technician is test-driving a vehicle with a manual transmission and observes that it grinds when shifting into third gear, but all other gears engage smoothly. The clutch is confirmed to be disengaging properly. What is the MOST likely cause of this issue?

Accepted Answer

A worn-out third gear synchronizer assembly

Answer

A damaged input shaft bearing

Answer

A bent shift fork for the 1-2 shift rail

Answer

Use of the incorrect type of gear oil

Question 3

A front-wheel-drive vehicle produces a rhythmic clicking or popping noise that is most prominent during sharp, low-speed turns. The noise is not present when driving in a straight line. This symptom is most indicative of a failing:

Accepted Answer

Outer Constant Velocity (CV) joint

Answer

Wheel bearing

Answer

Inner tie rod end

Answer

Lower ball joint

Question 4

Which of the following symptoms is MOST commonly associated with a worn universal joint (U-joint) on a rear-wheel-drive vehicle's driveshaft?

Accepted Answer

A clunking sound when shifting from Drive to Reverse

Answer

A burning smell after high-speed driving

Answer

A high-frequency whine that changes with road speed

Answer

A spongy feeling in the brake pedal

Question 5

A manual transmission is difficult to shift into any gear when the vehicle is stationary and the engine is running. However, it shifts normally through all gears when the engine is turned off. Which of the following is the MOST likely cause?

Accepted Answer

A dragging clutch

Answer

Worn shift forks

Answer

Low transmission fluid level

Answer

Worn synchronizer rings

Question 6

When setting up a new ring and pinion in a differential, the technician finds the drive-side contact pattern is concentrated high on the tooth, toward the face (or top) of the ring gear teeth. What adjustment is required to correct this pattern?

Accepted Answer

Decrease pinion depth (move pinion away from ring gear)

Answer

Increase backlash

Answer

Decrease backlash

Answer

Increase pinion depth (move pinion toward ring gear)

A customer with a manual transmission vehicle complains of a high-pitched squealing noise that occurs only when the clutch pedal is fully depressed.The noise disappears as soon as the pedal is released.What is the MOST likely cause?

A customer with a manual transmission vehicle complains of a high-pitched squealing noise that occurs only when the clutch pedal is fully depressed.
The noise disappears as soon as the pedal is released.
What is the MOST likely cause?