Method for replacing engine base of main engine of oil tanker

The invention discloses an oil tanker main engine base replacement method which comprises the following steps: disassembling a main engine smoke exhaust pipe and a main engine working platform, and installing a special hoisting tool for a main engine; mounting a reshipment lifting lug; a temporary supporting tool platform and a main machine upper assembly are arranged; a sliding rail is installed, a roller trolley is placed, and an old main engine base and a crankshaft are placed on the roller trolley; a process hole is formed in a position over against the old host base; the old main engine base is slid out of the cabin through the roller trolley, and then the new main engine base is moved into the cabin; the crankshaft is placed in the new main engine base, the idler wheel trolley, the sliding rail and the auxiliary hole are disassembled, and the new main engine base and the crankshaft are placed at the installation positions; transporting the host upper assembly to a new host base mounting position; and th