不预先加满冷却水就开动发动机的作法非常不好，因为机器内冷却水不多时，机温升高特别快。当气缸套和气缸盖处于很热状态时，加入的冷水会很容易使气缸套和气缸盖底板骤冷而产生裂纹，引起一连串的故障，如排气管冒烟，排水，水箱里冒气泡，燃油燃烧不完全，消耗增加，动力性 Do not pre-filled with cooling water to start the engine is not very good practice, because the machine when the cooling water is small, the machine temperature increases particularly fast. When the cylinder liner and the cylinder head are in hot condition, the added cold water can easily cause the cylinder liner and the cylinder head base plate to be cracked and cause cracks, causing a series of faults such as exhaust pipe smoke, drainage, bubbles in the water tank, Incomplete fuel combustion, increased consumption, power