Technician A says that a main bearing that has burned will often cause the main bearing bore diameter to become smaller in some places. Technician B says that main caps should be torqued in place before reboring the block. 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 A is correct because a burned main bearing can cause localized overheating and distortion, potentially leading to a reduction in the main bearing bore diameter in some areas. Technician B is correct because torquing the main caps in place before reboring ensures that the block is in its final, stressed state during machining, which is crucial for accuracy and the proper fit of the bearings.

Technician a Says That a Main Bearing That Has Burned