Cummins Engine part Cylinder Head 3411804/3406729/3075422 for Cummins NTA855 Engine.

Introduction of Cylinder Head

The cylinder head is installed on the top of the cylinder block, which seals the cylinder from the top and constitutes the combustion chamber. It is often in contact with high temperature and high pressure gas, so it bears a large thermal load and mechanical load. A cooling water jacket is made inside the cylinder head of the water-cooled engine, and the cooling water hole on the lower end face of the cylinder head communicates with the cooling water hole of the cylinder block. Use circulating water to cool high temperature parts such as the combustion chamber.

The cylinder head is also equipped with intake and exhaust valve seats, valve guide holes for installing intake and exhaust valves, as well as intake and exhaust passages. The cylinder head of a gasoline engine is machined with holes for installing spark plugs, while the cylinder head of a diesel engine is machined with holes for installing fuel injectors. The cylinder head of the overhead camshaft engine is also machined with a camshaft bearing hole for installing the camshaft.

The cylinder head is generally made of gray cast iron or alloy cast iron. The thermal conductivity of aluminum alloy is good, which is beneficial to improve the compression ratio.

The cylinder head is an integral part of the combustion chamber. The shape of the combustion chamber has a great influence on the operation of the engine. Due to the different combustion methods of gasoline engines and diesel engines, the parts of the cylinder head that make up the combustion chamber are quite different. The combustion chamber of a gasoline engine is mainly located on the cylinder head, while the combustion chamber of a diesel engine is mainly located in the pit on the top of the piston.