This should cover both duties.

Enginemen (EN) operate, maintain, and repair (organizational and intermediate level) internal-combustion engines, main propulsion machinery, refrigeration, air conditioning, gas turbine engines, and assigned auxiliary equipment on Navy ships; stand safety watches on auxiliary boilers and other assigned equipment.
https://www.navycs.com/navy-jobs/engineman.html

Enginemen operate, service and repair internal combustion engines used to power some of the Navy's ships and most of the Navy's small craft. Most Enginemen work with diesel engines. Enginemen also operate and maintain electrohydraulic controllable-pitch propeller systems and steering engines, refrigeration and air conditioning systems, air compressors, desalinization plants and small auxiliary boilers.

aligning fuel, water and air piping systems and controlling operation of diesel engines used for ship and small craft propulsion, and to generate electrical power;
cleaning, lubricating, adjusting, testing and performing other preventive maintenance on diesel engines, reduction gears, air compressors, hydraulic or pneumatic clutches, steering engines and controllable-pitch propeller systems;
operating and maintaining desalinization plants used to make fresh water from sea water;
repairing or replacing valves, pumps, compressors, heat exchangers and control devices used with diesel engines and gas turbines; making entries into and analyze machinery operating records and reports\https://en.wikipedia.org/wiki/Engineman

Матрос-моторист на разъездной катер (Дудинка)

Обязанности:

Обеспечение постоянной технической готовности судов обеспечения к выполнению поставленных производственных задач. Обеспечение выполнения технического обслуживания и ремонта судовых механизмов, систем и корпуса.

Требования:

Лица, прошедшие подготовку в учебном центре, имеющие квалификационное свидетельство и сертификаты установленной формы, дающие право занимать данную должность, хорошо знающие конструктивные особенности судна

Условия:

Сменный режим работы; Ежегодный оплачиваемый отпуск; Оплата проезда к месту проведения отпуска 1 раз в 2 года; Ежемесячное премирование; Дополнительное медицинское страхование.
https://dudinka.hh.ru/vacancy/43923253?utm_source=russia.tru...