During the preventive maintenance period, with the objective to prevent potential defects in the future, our service engineers performed a replacement of the flexible couplings on Caterpillar generators CAT 3512 on the 72 m diesel electric motor yacht with the Azipod propulsion thrusters. A special goal was to have rails welded across the gen sets frames so that the front mounts can slide across, over the rail which have been supported from the bottom of the “I” beam to add stiffness.