это двухтактный крейцкопфный реверсивный дизель , цифры - диаметр/ход поршня в см. такого плана движки используются в качестве главных без редуктора - обороты 75-110об/мин.
чертеж если и найдете будет поперечный разрез - искать в учебниках по судовым силовым установкам. типа www.centrmag.ru/book2204612.html колличество цилиндров обычно не четное 5-7-9
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