Question 162Motor Plants - 1st Asst/Chief

The correct answer is B) The normal play on both sides of the shaft will be one tenth of a millimeter. This is the correct answer because the typical clearance between the shaft and the bearing housing in a marine engine application is around 0.1 mm on each side. This small clearance allows for thermal expansion and prevents excessive wear while maintaining a stable hydrodynamic oil film. The tolerances are standardized across manufacturers and established through engineering best practices for marine machinery. The other options are incorrect because A) the tolerances are typically standardized, C) the clearance is on both sides, not just one, and D) the clearance is measured during installation, not just while underway.