The MV Arenig Fawr a dredging vessel operated by Strategic Marine Services ltd, which operates on the River Dee to ensure a clear channel for the Airbus A380 wing barge.
During the annual dry-docking period Strategic Marine replace a Caterpillar C7 main engine, an auxiliary Caterpillar 3056 engine and a Vetus generator. Reconditioned ‘spare’ engines are installed as replacements, whilst the engines are overhauled and preserved for storage, awaiting the next scheduled dry-dock period.
Initially the 3 engines were partially stripped to remove and inspect a set of main bearings, LE bearings and piston rings, witnessed by vessel Superintendent.
Following inspection, both the C7 and 3056 cylinder heads were reconditioned, replacing valves, seats and guides.
A complete set of main, LE bearings and piston rings were replaced on the C7 Caterpillar engine, with the 3056 only requiring only a single unit inspection and rebuild.
Following rebuild the engines were preserved for storage and resprayed.