About Us At Chet Ruminski Marine, our focus is on Diesel repowering and gas to diesel conversions. Marine service on all systems including main propulsion, generators, electrical, hydraulic and mechanical systems. Current main project is repowering a 36' Tiara with 450C Cummins' engines. Job includes rewiring, soundproofing and adding an additional station on the hardtop. Work progress will be documented on this site.