Technician A says that a compression test can be used to check the condition of the oil control rings. Technician B says that when several cylinders have low compression test readings, this can be due to burned or tight valves. 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

Technician B is correct because low compression in several cylinders can indeed be indicative of issues with the valves, such as them being burned or not sealing properly. A compression test primarily checks for the condition of the piston rings, valves, and the cylinder's ability to hold pressure, but it is not specifically designed to check the condition of the oil control rings; that would be more directly assessed with an oil consumption test or a cylinder leak-down test.

Technician a Says That a Compression Test Can Be Used