Two technicians are discussing oil filters. Technician A says the oil filter has an anti-drain-back valve that prevents the oil in the filter and engine oil passages from returning to the sump when the engine is shut down. Technician B says the oil filter has a bypass valve that in the event the filter becomes plugged, oil can flow directly to the bearings. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

Both technicians are correct. Technician A is correct about the anti-drain-back valve, which prevents oil from draining out of the filter and passages when the engine is off, ensuring immediate oil pressure upon startup. Technician B is correct about the bypass valve, which allows oil to bypass the filter if it's clogged, ensuring the engine receives oil.

Two Technicians Are Discussing Oil Filters