Which of the following symptoms most indicates the clutch disc wear?
Show the correct answer
Correct answer
C. Abrupt increase in the engine revolutions without an increase in speed during acceleration.
Explanation
The question is about the symptom that most indicates a worn clutch disc. It is a sudden rise in engine revs with no increase in speed during acceleration - answer C.
The Road Traffic Act requires a vehicle to be maintained so that using it does not endanger safety. A worn clutch disc loses grip and starts to slip: when you press the accelerator hard, especially uphill or with a full bus, the engine revs jump up, but the bus hardly accelerates. Often you can also smell burning. Resistance of the lever when changing gear (answer A) and difficulty in engaging first or reverse gear (answer B) point rather to the clutch not disengaging fully or to worn synchronisers. A slipping clutch quickly overheats, so you go to a workshop before the bus breaks down on the route.
Legal basis: Art. 66 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym)