After following the prescribed procedures to measure the thrust bearing clearance shown in the illustration, the distance "F" is determined to be 200 mm, and 'f1' is 2.3 mm. Which of the following statements describes the condition indicated by these dimensions? Illustration MO-0121

Correct Answer: Option B — It is possible for the shaft to move axially 2.3 mm during astern operation and relates to an excess movement of 1.3 mm, 0.3 mm beyond the maximum worn play.

Thrust bearing axial play measurements exceeding baseline parameters indicate wear. A recorded clearance of 2.3 mm against standard baselines signifies total displacement during astern operation that surpasses maximum allowable wear limits, requiring corrective overhaul.