Two technicians are discussing compression test results. Technician A says that abnormally low compression in adjacent (neighboring) cylinders most likely indicates a bad head gasket. Technician B says that if the reading on the compression tester goes up after adding oil to the cylinder, the compression rings are probably worn. 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 A is correct that abnormally low compression in adjacent cylinders indicates a bad head gasket, as the gasket may have failed between cylinders and is allowing pressure to escape. Technician B is also correct that if the compression tester reading goes up after adding oil to the cylinder, the compression rings are probably worn as the oil helps create a temporary seal, increasing the compression reading. Therefore, both technicians are correct.

Two Technicians Are Discussing Compression Test Results