Ship main motor cooler system has been install for cooling of used on ship main and helper system. Air, oil, sea water, sweet water can use to be cooling. Open circuit cooling is not used again system cooler and are the systems that are thrown out of the system. These are the systems where the cooling water machines taken on board are circulated and thrown out after cooling the machines. Closed circuit cooling Systems where the system cooler is reused and thus this cooler is also cooled.These cooling machines work together with a system that allows them to be cooled as they circulate and heat. Circulated to machines cooling water is sweet water. If it fall off, it will reinforce. This water coolers with sea water and again throw to sea.