【Fault description】
    A Honda 2.2 sedan driving more than thirty thousand kilometers, parked for more than six months, during which very little use, after re-opening, the engine water tank boil phenomenon.
    【Inspection process】
    After the inspection, the water tank, water pipes do not leak, cold start, the cooling water cycle is good, the cooling fan work properly, no water bubbles inside the tank. The engine work for about 10 minutes, the water temperature can reach the normal value. After the water temperature continued to rise, 20 minutes later, the water tank boil. After a few days of driving, the engine disassembled the crankshaft strain seriously, has exceeded the repair limit, the crankshaft and the connecting rod are calendered and the cylinder wears seriously. Put on another engine, the water temperature is still high.
    Finally removed the muffler, the water temperature was restored often. The reason is that the muffler blockage caused by poor exhaust, resulting in engine temperature rising. Thus making the oil thinning, the formation of dust particles. At this point, the oil will not only play the role of lubrication, on the contrary will exacerbate wear and tear, leading to damage to mechanical parts. Anatomy muffler, the internal corrosion of rust has become rotten, blocking the exhaust pipe import and export, replace the muffler after the engine is working properly.
    But the road test, driving tens of kilometers later, the water temperature is still high, and sometimes even boil. And then carefully check found that the car before the network, the water tank is replaced by a new license plate, so that the tank radiator ventilation is poor, causing high water temperature. Adjust the position before the license plate, the water tank pan failure completely ruled out.
    【Fault Analysis】
    It can be seen, the engine high temperature failure for many reasons, the consequences are very serious. Especially in high temperature areas, the vehicle is not normal use, while the acceleration of mechanical wear, shorten the life of the engine, and even cause damage to the machine. Therefore, we should correctly judge, promptly troubleshooting, eliminate hidden dangers.