ASE ASE Manual Drive Train and Axles

Question 1

A manual transmission grinds when shifting into 2nd gear but all other gear changes are smooth. What is the MOST likely cause?

Accepted Answer

Faulty 2nd gear synchronizer assembly

Answer

Grinding specific to one gear indicates the synchronizer for that gear is worn and cannot match shaft speeds before engagement.

Question 2

A technician notices a manual transmission is hard to shift into any gear when the engine is running but shifts freely with the engine off. What component is MOST likely at fault?

Accepted Answer

Clutch not fully releasing (dragging clutch)

Answer

A dragging clutch does not fully disengage the input shaft from the engine, keeping the gearset spinning and making engagement into any gear difficult.

Question 3

What is the function of the pilot bearing or bushing in a manual transmission system?

Accepted Answer

It supports the front of the transmission input shaft in the crankshaft

Answer

The pilot bearing or bushing supports the tip of the transmission input shaft inside the crankshaft, keeping it aligned when the clutch is released.

Question 4

A rear-wheel-drive vehicle vibrates at highway speeds but the vibration disappears when the driver lightly applies the brakes. What is the MOST likely cause?

Accepted Answer

Worn universal joint in the driveshaft

Answer

A worn or loose universal joint produces a vibration that changes under load; lightly braking shifts the driveline load, altering the phase angle and temporarily reducing the vibration.

Question 5

What is the purpose of the clutch release bearing (throw-out bearing)?

Accepted Answer

It allows the non-rotating clutch fork to apply force to the spinning pressure plate fingers

Answer

The release bearing is a thrust bearing that contacts the spinning pressure plate diaphragm spring fingers while the clutch pedal is depressed, allowing stationary fork force to release the rotating assembly.

ASE - Automotive Service Excellence Certified Tech Practice Test

ASE - Automotive Service Excellence Certified Tech Practice Test

ASE ASE Manual Drive Train and Axles