Water-cooled
The oil cooler is placed in the cooling water circuit and uses the temperature of the cooling water to control the temperature of the lubricating oil. When the temperature of the lubricating oil is high, the temperature of the lubricating oil is reduced by the cooling water. When the engine is started, the heat is absorbed from the cooling water to increase the temperature of the lubricating oil quickly. The oil cooler consists of a shell made of aluminum alloy, a front cover, a rear cover and a copper core tube. In order to enhance cooling, heat sinks are fitted outside the tube. Cooling water flows outside the pipe, and lubricating oil flows inside the pipe, and the two exchange heat. There are also structures in which oil flows outside the pipe and water flows inside the pipe.