Manual Drivetrain and Axles Flashcards
7 cards from real NAPA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Manual Drivetrain and Axles flashcards as text
A hydraulic clutch pedal slowly sinks to the floor when held down at a stop, and the clutch begins to drag. What is the most likely cause?
Answer: Internal leak past the master cylinder primary seal
Fluid bypassing the master cylinder seal lets pressure bleed off, so the pedal sinks and the clutch stops releasing fully.
A customer reports clutch chatter when accelerating from a stop. Which condition is LEAST likely to cause it?
Answer: Insufficient clutch pedal free play
Too little free play usually causes slipping and early release bearing wear, not chatter.
Engine RPM rises quickly during hard acceleration in high gear, but vehicle speed barely increases. Technician A says the disc may be worn to the rivets. Technician B says the pedal may have no free play. Who is correct?
Answer: Both A and B
A worn-out disc and a release system that never fully lets go of the pressure plate both cause slipping.
A chirping or squealing noise appears only when the clutch pedal is fully depressed with the engine running. What is the most likely cause?
Answer: Failing pilot bearing or bushing
With the pedal depressed, the input shaft is stopped while the crankshaft keeps turning, which loads the pilot bearing.
Before reusing a flywheel during a clutch replacement, which check matters most?
Answer: Lateral runout and surface condition
Excessive runout or a damaged surface causes chatter and uneven disc wear, so the flywheel must be measured and resurfaced or replaced as needed.
On a dual-mass flywheel, which finding normally calls for replacement rather than resurfacing?
Answer: Excessive free play or rocking between the primary and secondary masses
Worn internal springs or bearings in a dual-mass flywheel show up as excessive play, and most manufacturers do not allow resurfacing.
After replacing a hydraulic clutch slave cylinder, the pedal feels spongy and the clutch does not fully release. What should the technician do next?
Answer: Bleed air out of the clutch hydraulic system
Air left in the system compresses, which causes a spongy pedal and incomplete release.