Technician A says that valvetrain noise will occur at half the speed of engine rpm. Technician B says valvetrain noises coming from inside the timing cover can be caused by a bad timing chain or chain guide. Which technician is correct?
A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question

Quizplus · Accepted Answer

Valvetrain noise occurs at half the speed of engine rpm because the camshaft, which operates the valves, turns at half the speed of the crankshaft. Technician B is correct because a bad timing chain or chain guide can indeed cause noises from inside the timing cover, as these components are crucial for the timing and operation of the valvetrain.

Technician a Says That Valvetrain Noise Will Occur at Half