2018 Bow Thruster Maintenance - Final Service Report 1.pdf

This is a condition/required report from Colonna's Shipyard documenting bow thruster maintenance performed on the vessel Freedom Star, along with an attached service report from BNA Marine Services detailing the maintenance work conducted from June 25-July 5, 2018.

The maintenance involved an Omega OCP 400 bow thruster unit, which underwent comprehensive inspection and repairs. Initial findings showed proper thrust lift measurements but indicated leakage around the blades/seals from an undersized O-ring. The work included removal of blades for cleaning and NDT testing, complete thruster removal and disassembly, replacement of various seals and bearings, and repairs to the O-ring groove area using metal epoxy. Multiple tests were conducted including pitch testing for ABS certification. The root cause of the original leak was determined to be an undersized O-ring (6mm) installed during previous yard work; this was corrected by installing the proper 7mm O-ring with flange sealant 574. The work was performed at Colonna's Shipyard in Norfolk, VA by BNA Marine Services technician Rick Hartenstine, with Job #40654 and Work Order #2130-001.