The crack prevention of cylinder block and cylinder head

The causes of cracks in the cylinder block and cylinder head result from the irrational structure, material and manufacturing process problems, also has the use and maintenance. The problem of improper. From the point of use, maintenance, cylinder block and cylinder head crack prevention measures mainly include the following: ( ) Engine don't overload for a long time. Because it can lead to high thermal stress cylinder body. ( ) The engine is in a state of high temperature, do not suddenly add cold water. If engine driving found in water, must to motive temperature decrease after adding cooling water, prevent crack due to cylinder body and the water temperature difference is too large; Before starting the engine, should add sufficient cooling water, so as not to add cold water after starting or water temperature. ( ) In the water jacket scale should keep clear of in time. Scale too much will not only reduce the cooling water through the area, and due to poor scale heat transfer and reduce the cooling performance of the engine. Especially between cylinder and valve seat after waterway blocked, will greatly reduce the heat dissipation performance, make the local working temperature, thermal stress and crack. ( ) After the engine starting, not immediately at high speed to prevent due to vibration and increase the load on the cylinder block, crankshaft, cracks in weak positions. ( ) The rational use of the accelerator pedal. At any time to avoid sharp boom oil; When the car speed up, open the throttle can neither too nasty, also cannot too slowly; Driving through manipulation of the accelerator pedal in reasonable adjust the power of the engine, to avoid a pilot time high rotation speed and overload. ( ) Cold winter night outdoor parking, must put clean the cooling water; When the engine is not easy to start, the best heating water preheating before. Temporary parking (for a long time General h +) , also should put the cooling water, and to put thoroughly; In the absence of water, should be timely starting the engine, the engine keep a certain temperature. If already use antifreeze, in keeping with the rules is another matter.