Transport Malta’s MSIU issued an investigation report on the main engine failure of the oil/chemical tanker ‘MV Guroni’ while underway in January 2019. According to the report, the lubrication oil filter of the main engine had been improperly mounted, which eventually resulted to severe damages to the components of the main engine and a complete failure of the main engine.
MV Guroni was en route from the port of Klaksvik in the Faroe Islands, Denmark, to Rostock, Germany, in ballast. The vessel was scheduled to take bunkers off Skagen, Denmark.
On 08 January 2019, at 0742, while the vessel was navigating through Skagerrak, an oil mist detector alarm was observed in the engine-room, followed by a lubricating oil low pressure alarm.
Assuming that these were false alarms, the crew members reset the alarms.
At 1100, as the weather conditions worsened, the master decided to reduce the speed of the main engine.
Following the reduction in the main engine’s rpm, the speed of the vessel was observed to be around 4.5 knots.
The oil mist detector alarm sounded a couple of times more in the afternoon, but the system was again reset.
At 1634, while taking a routine round in the steering gear room, the second engineer noticed an abnormal change in the sound of the main engine.
On entering the engine-room, he noticed that the main engine had stopped and there was significant smoke in the area. He also noticed sparks around some of the crankcase covers.
A couple of minutes later, the chief engineer arrived and immediately started to investigate.
He checked the crankcase covers and noticed that the temperatures of all the covers were normal.
After concluding that the smoke was not emanating due to a fire, he opened the engine room skylight in order to vent out the smoke.
In the meantime, the master had ordered for the anchors to be prepared.
At 1645, the chief engineer informed the master that he was unable to restart the main engine. As the master noticed that the vessel was drifting toward land, anchors were dropped at 1706.
After unsuccessful attempts to restart the main engine, it was decided to have the vessel towed to a repair facility in Rotterdam, The Netherlands.
At the repair facility, it was found that the lubrication oil filter of the main engine had been improperly mounted.
This resulted in inadequate lubrication of the main engine, leading to irreparable damage to the crankshaft.
Probable cause of the oil mist alarm
The damages sustained by the main engine’s running gear seem to indicate that these components were subjected to extensive friction.
The cylinder pistons, liners and crank pin bearing journals of the crankshaft showed similar signs of friction.
The friction between the components of the engine would have probably resulted in the generation of high temperatures within the crankcase spaces of the engine due to microwelding, as a result of restricted lubrication.
These high temperatures (hot spots), in turn, would have led to the vaporisation of oil, building up an oil mist, as already explained. This would have triggered the oil mist detector alarm.
- The lubricating oil filter was reassembled incorrectly, restricting the flow of lubricating oil to the main engine.
- The restricted oil flow compromised lubrication of the main engine’s running gear, leading to the overheating of these components.
- The oil mist detector alarm was triggered a number of times, probably due to generation of oil mist caused by the overheating of the engine’s components.
- These alarms were erroneously assumed to be false and consequently, accepted by the crew members.
- The unfavourable weather conditions could have adversely affected the quality of rest of the crew members, which in turn would have affected their ability to effectively monitor the situation in the engine room.
- The occurrence resulted in severe damages to the components of the main engine and a complete failure of the main engine.
Transport Malta recommended the operating company to ensure that the safety management system manual addresses the critical importance of the oil mist detector and lists down the procedures to be followed in case of an alarm.
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