Question 161Motor Plants - 1st Asst/Chief

The correct answer is C) 0.80 mm. The maximum allowable clearance permitted between the bearing shown in the illustration MO-0121 and the shaft along its vertical axis is 0.80 mm. This value is based on the standards and regulations set forth by the US Coast Guard for engine and shaft installations in vessels. The other options are incorrect because 0.30 mm (A) is too tight of a clearance, 0.46 mm (B) is also on the tighter side, and 1.00 mm (D) is too loose and would exceed the recommended maximum clearance. The 0.80 mm (C) value falls within the acceptable range specified by the US Coast Guard for this type of bearing and shaft configuration.