Cylinder head sealing problem analysis

Cylinder cover sealed performance is good or bad, directly affect the technical condition of the engine, serious when, engine power has fallen sharply, even unable to work. Such as when the cylinder gasket after burning, engine cylinder compression force is insufficient, its speed decreases significantly, and the exhaust smoke ( White smoke) , have air bubbles in the water tank ( And cooling water consumption too fast) , the surface of the product such as the oil bubble phenomenon. A, cylinder pad incorrect use and installation of cylinder pad is installed in the engine cylinder block and cylinder head, its role is to ensure that the sealing of the combustion chamber, prevent gas, cooling water and lubricating oil leakage. Therefore, the use of cylinder pad and installation is not required, will directly affect the sealing reliability of the cylinder head and cylinder pad service life. In order to ensure the quality of seal, choose cylinder pad must be same as the original cylinder with the specifications and the thickness, the surface should be smooth, package edge joint is firm, and there are no scratches, dents, zou and rust stains. Otherwise, it will affect the quality of cylinder head seal. When replacement cylinder pad, shall be carried out in the cold machine, cylinder head has positive and negative, positive is more smooth, opposite is coarser, should be paid attention to when assembly. Due to the cylinder gasket crock mouth edge side ( Reverse side) For projection quantity and it will cause the contact plane indentation deformation. Therefore, when installing edge side ( Reverse side) The contact area should be toward the easy dressing or hard surface, General cylinder head and cylinder block is cast iron, the edge ( Reverse side) Should be toward the cylinder cover; If the cylinder head for aluminum alloy, for cast iron cylinder body, edge ( Reverse side) Should be toward the cylinder block. ) , and the positioning hole should be on the cylinder block locating pin. In addition, cylinder pad for reuse, and due to lower elastic deformation, the sealing performance and using performance will be affected. So, in general, cylinder pad don't repeat use. If you want to reuse the old cylinder pad, in front of the assembly can be heated to ℃ boiled in on waste oil. H. So can effectively make within the cylinder gasket asbestos, restore its elasticity performance, improve the sealing and the use of reliability. Two minor jitter of the cylinder head, cylinder head, slightly beat is under the action of compression and combustion pressure, cylinder head is the result of trying to separate from the cylinder block. These pressure spin to connect the cylinder head bolts, thus cause the cylinder head and cylinder block relatively have a mild beating. That slight jitter will relax the cylinder head gasket occurred and compaction process, so as to speed up the cylinder head gasket is damaged, affect the sealing performance. In normal circumstances, this kind of slight jitter is very small, almost zero. So, under normal circumstances, it will effect the performance of the cylinder seal is very small, almost zero. However, in the case of abnormal, the effect of the beating of cylinder sealing performance is very obvious.