工程机械发动机冷却系统有水冷和风冷两种形式，绝大多数为水冷式系统。水冷发动机的水箱缺水时，可能发生漏水现象。漏水可以分为三种情况：向外漏水、向内漏水、油水混合。向外漏水即水向发动机以外泄漏，不影响发动机内部各系统；向内漏水是水向发动机内部泄漏，使润滑系统 Engineering machinery engine cooling system has two forms of water-cooled and air-cooled, the vast majority of water-cooled system. Water-cooled engine water tank may have water leakage. Water leakage can be divided into three situations: outward leakage, inward leakage, oil and water mixture. Water leakage to the water outside the engine leaks, does not affect the internal system of the engine; inward leakage is the water leak to the engine so that the lubrication system