Two technicians are discussing crankshaft bearing installation. Technician A says that upper and lower main bearing inserts are always interchangeable. Technician B says to lubricate the backsides of the bearing inserts before installing them. 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 lubricating the backsides of the bearing inserts before installation is not recommended; lubrication is applied to the surface that contacts the crankshaft to ensure proper lubrication during engine operation. Technician A is incorrect because upper and lower main bearing inserts are not always interchangeable; they may have different designs or features to accommodate specific load characteristics or oil flow requirements in the engine.

Two Technicians Are Discussing Crankshaft Bearing Installation