Question 13Motor Plants - 1st Asst/Chief

The correct answer is B) taking micrometer readings between the crank cheeks opposite the crankpin every 90° of crank angle rotation. This method is effective for determining crankshaft misalignment because it allows you to detect any variation in the distance between the crank cheeks at different points in the crankshaft's rotation. If the crankshaft is misaligned, the crank cheek spacing will change as the crankshaft rotates, which can be measured precisely using a micrometer. The other options are less effective for this purpose. Option A measures only in two places, which may miss localized misalignment. Option C measures crank drop, which is not the same as crank cheek spacing. Option D measures bearing clearances, which does not directly indicate crankshaft alignment.