A cut-a-way engine used for instruction. The cylindrical object on the top appears to be a added indicator device to indicate the combustion cycle stage for each cylinder.
210 hp to 265 hp
Museu de Marinha Lisbon Portugal, Jan 2020
Translation...
Isotta Fraschini engine for Macchi M18 seaplane. Acquired from Italy in 1928 for aviation instruction and training.
The engine cut was used in the instruction of devices and mechanics in the naval aviation and after the extinction of this served to instruct the courses of merchant navy school mechanics.
Offered in 1977 by the merchant navy state secretary./p>