Abstract: An aluminium cylinder head for a compression-ignition internal combustion engine is formed with precombustion chambers and a cooling chamber. The cooling chamber is delimited in part by the walls of the precombustion chambers and by a base wall the outer surface of which faces into the cylinders of the engine when the head is assembled onto the engine cylinder block. To allow for expansion of the base wall during engine operation, said base wall is provided with transverse slits intermediate the portions of the head corresponding to the engine cylinders.

Abstract: An aluminum cylinder head for a compression-ignition internal combustion engine is formed with a cooling chamber and a number of cavities which provide for each cylinder of the engine a precombustion chamber in communication at its upper end with a seat for a fuel injector. Each precombustion chamber and its associated fuel-injector seat are delimited by a wall the outer surface of which faces into the cooling chamber. The cooling chamber is separated by a dividing wall into a lower part adjacent the precombustion chambers and an upper part adjacent the fuel injector seats. Openings are provided in the dividing wall juxtaposed the precombustion chambers so that coolant flowing through said openings between the lower and upper parts of the cooling chamber is constrained to flow against the walls of the precombustion chambers.

Abstract: A cylinder head for a compression-ignition internal combustion engine comprises a lower part of cast iron, an intermediate part of aluminium, and a cap element, also of aluminium. Defined within the cast-iron lower part are precombustion chambers for the engine cylinders, induction and discharge ducts and a cooling chamber. The regions of the head subjected to the highest temperatures during running of the engine are thus formed in the cast-iron part which minimizes difficulties caused by thermal stresses. A breather cavity is defined between the cast-iron lower part and the aluminium intermediate part. The upper surface of the intermediate part is shaped to form an oil bath and is arranged to rotatably support the engine camshaft in this bath. Apertures through the intermediate part serve both to regulate the oil level in the bath and to provide access to fixing bolts securing the lower part of the head to the engine cylinder block.

Abstract: A cylinder head for a compression-ignition (diesel) engine has a sector accommodating the upper part of a fuel injector between four valves, the sector being isolated from the tappet lubricating oil by a protecting casing on the upper part of the cylinder head. The casing may itself be sealed by a protective and sound-proofing cover.