Technician A says positive valve stem seals fit loosely around the top of the stem. Technician B says positive stem seals scrape oil off the valve as it moves up and down. Who is correct?

Question

Quizplus · Accepted Answer

Technician B is correct because positive stem seals are designed to scrape oil off the valve stem as it moves up and down to prevent excessive oil from entering the combustion chamber. Positive valve stem seals do not fit loosely; they are designed to fit snugly to effectively control oil flow.

Technician a Says Positive Valve Stem Seals Fit Loosely Around