139. After packing is added to the stern tube stuffing box, which of the following procedures should be observed to insure even tightening of the gland?

A. Listen for a smooth, regular sound.
B. Measure the distance between the gland and the stuffing box with a rule.
C. Judge by feeling the gland for an increase in heat as it is being tightened up.
D. Open the drain connection to allow seawater to flow in and make the distance even.