Which of the following would cause the dowel or locking lip of a split-type, precision insert, main bearing to shear and allow the bearing to rotate with the journal?

Correct Answer: Option D — Insufficient bearing crush

Insufficient bearing crush fails to secure precision insert halves tightly within the housing bore. Without adequate radial pressure holding the shell in place, frictional drag from the rotating journal causes the bearing insert to rotate, shearing the locking lip.