6D105 Engine Cylinder Head 6137-11-1012 For KOMATSU

1. Working conditions and requirements of cylinder headThe cylinder head is subjected to the mechanical load caused by the gas force and the tightening of the cylinder head bolts, and at the same time it is subjected to a high thermal load due to the contact with the high temperature gas. In order to ensure good sealing 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 well cooled.2. Cylinder head materialCylinder heads are generally made of high-quality gray cast iron or alloy cast iron, and gasoline engines for cars mostly use aluminum alloy cylinder heads.3. Cylinder head structureThe cylinder head is a box-shaped part with complex structure. It is processed with intake and exhaust valve seat holes, valve guide holes, spark plug mounting holes (gasoline engine) or fuel injector mounting holes (diesel engine). Also cast in the cylinder head are the water jacket, the intake and exhaust ports and the combustion chamber or part of the combustion chamber. If the camshaft is installed on the cylinder head, the cylinder head is also processed with a cam bearing hole or a cam bearing seat and its lubricating oil passage.The cylinder head of the water-cooled engine has three structural forms: integral type, block type and single type. In a multi-cylinder engine, if all cylinders share one cylinder head, the cylinder head is called an integral cylinder head; The cylinder head is a single cylinder head. Air-cooled engines are all single-piece cylinder heads.