Exam 49: Diagnosing Engine Mechanical Problems

When engine oil has not been regularly changed, thick, dirty oil can plug the oil return holes in the cylinder head.

In which locations can internal leaks occur?

While having a discussion, Technician A says that a rear main bearing seal leak is indicated when there is oil on the transmission side of the torque converter. Technician B says that a rear main bearing seal leak is indicated when there is oil on the engine side of the flywheel or torque converter. Who is correct?

Water leaking into the crankcase will contaminate the oil. This is called ____________________.

Internal leaks are diagnosed using the compression tester.