A customer called Off-Highway Powertrain Services (OHP Services) with a request concerning the transmission of a ship. Because of the weight of the engine system, it was not feasible to separate the transmission from the engine. Therefore, Powertrain Services used endoscopy through the oil filler plug to evaluate the condition of the inside of the transmission. The endoscopy allowed us to view all the bearings around the driveshaft and the output shaft.
Damaged bearing seat
After gathering findings about the possible origin of the root cause, OHP Services was able to dismantle only the affected parts of the transmission to enable further detailed investigations. When opening the bearing cap OHP Services discovered an incorrectly installed and defect shaft seal. OHP Services also detected swarf contamination in the oil. Further investigation revealed the reason for this; it was discovered that the axial roller bearing of the driveshaft had broken. Excessive pressure and insufficient oil transported to the top roll can be reasons for the bearing breakage and the defect sealing.
As this service job was planned and the special sealing and bearings were ordered based on the previous inspection, the repair time and the resulting dockyard costs were reduced to a minimum.