Technician A says that excessive clearance on a rod bearing can cause a knocking sound from the engine bottom end. Technician B says that a cracked flexplate can cause a knocking sound from the engine bottom end. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Excessive clearance on a rod bearing can cause a knocking sound from the engine bottom end because it allows the connecting rod to move around excessively, leading to metal-to-metal contact with the rod journal on the crankshaft. Similarly, a cracked flexplate can also cause a knocking sound from the engine bottom end because it causes the torque converter to hit against the flexplate and create a knocking noise. Therefore, both Technician A and Technician B are correct.

Technician a Says That Excessive Clearance on a Rod Bearing