Technician A that says free and positive are two types of valve rotators. Technician B says that valve grinding should start with truing the valve tip; then the face should be refinished. Who is right?

Question

Quizplus · Accepted Answer

Technician A is correct because there are indeed two types of valve rotators: free and positive, which are mechanisms used to rotate the valve slightly each time the valve closes to promote even wear and heat distribution. Technician B is also correct in stating that valve grinding should start with truing the valve tip before refinishing the face, as this ensures the valve seats properly and improves the engine's efficiency and longevity.

Technician a That Says Free and Positive Are Two Types