An entablature is a part of the ship’s main engine. It is the housing that holds the cylinder liner, along with the scavenging air space and cooling water spaces. The entablature is usually made of cast iron.
While assembling or installing an engine in the ship, entablature can be fitted either by making casting for each cylinder of the engine and then bolting the mating surfaces together, or by casting in multi-cylinder units and then bolting them together.
Fitted bolts are used to align and bolt the “A” frame to the entablature. It is to note that the “fitted bolts” that are used to bolt entablature, A” frames, and bedplate together are only for alignment purposes and not to resist stresses generated as a result of firing forces. This work is done by tie rods.
Damage to entablature can lead to loss of engine power and may also cause damage to the crankshaft and other components.
The Entablature of the engine comprises the cooling jacket for the cylinder liner where the high-temperature combustion takes place. The water is passed around the liner through this jacket which absorbs the heat of the liner and avoids thermal stresses.