Marine diesel engine parts L23/30 cylinder head

The cover of the engine and the parts that close the cylinder (including the water jacket, the valve and the cooling fin) are the installation base of the valve mechanism and the sealing cover of the cylinder.

The cylinder head is made of cast iron or aluminum alloy. It is the installation base of the valve mechanism and the sealing cover of the cylinder. The combustion chamber is formed by the cylinder and the top of the piston. Many have adopted a structure in which the camshaft support seat and the tappet guide hole seat and the cylinder head are cast into one body.

Cylinder head damage is mostly caused by warped deformation of the sealing plane of the cylinder head and cylinder hole (damage the seal), cracks in the intake and exhaust valve seat holes, and damaged spark plug installation threads. In particular, cylinder heads made of aluminum alloy have lower material hardness and relatively poor strength, and are easier to deform and damage, so they consume more than cast iron.

The cylinder head bears the mechanical load caused by the gas force and the tightening of the cylinder head bolts, and at the same time bears a high thermal load due to contact with high temperature gas. In order to ensure a good seal of the cylinder, the cylinder head must neither be damaged nor deformed. For this reason, the cylinder head should have sufficient strength and rigidity. In order to make the temperature distribution of the cylinder head as uniform as possible and avoid thermal cracks between the intake and exhaust valve seats, the cylinder head should be cooled well.