A noise occurs at 1⁄2 crankshaft rpm. Technician A says that this could be a bad lifter. Technician B says that this could be a valve that needs to be adjusted. Who is right?
A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question

Quizplus · Accepted Answer

Both Technician A and Technician B are correct. A noise occurring at 1/2 crankshaft rpm usually indicates problems with the valvetrain, specifically a bad lifter or a valve that needs to be adjusted. It is important to diagnose the issue further to determine the exact cause of the noise.

A Noise Occurs at 1⁄2 Crankshaft Rpm