Technician A says that normal main bearing wear is on the top. Technician B says that worn lower main bearings can be caused by lugging the engine. Who is right?

Question

Quizplus · Accepted Answer

Technician B is correct. Lugging the engine can cause excessive stress on the lower main bearings, leading to premature wear. Technician A is incorrect because normal main bearing wear can occur on both the top and bottom bearings depending on factors such as engine design and operating conditions.

Technician a Says That Normal Main Bearing Wear Is on the Top