A method of cleaning a cylinder head using pressurized fluid and a tooling assembly for the same includes a jet ignition insert attached to a spark plug well defined by the cylinder head. The insert defines an opening in fluid communication with the spark plug well. The insert includes an end wall attached to the insert distal end to close one end of the opening and the end wall defines holes. The tooling assembly includes a tool configured to clean the insert. A first engagement surface of the insert and a second engagement surface of the tool engage each other to form a seal that surrounds the holes of the insert such that the pressurized fluid is directed through the holes and into the opening of the insert during the first operation procedure of the tooling assembly to flush debris out of the holes of the insert.

The present disclosure relates to assemblies for engines such as pre-combustion chamber assemblies for spark ignition engines. In one example, a pre-combustion chamber assembly includes an ignition chamber adapted to contain at least one electrode of a spark generator. The ignition chamber being adapted to communicate with a main engine combustion chamber via a plurality of pre-chamber ports. The ignition chamber communicates for removal therefrom of exhaust gas residuals to a distinct storage chamber via at least one transfer port. The ignition chamber includes a single substantially cylindrical entrance channel leading from said pre-chamber ports in a direction towards an ignition region of the ignition chamber. The ignition region having a larger cross-section than the entrance channel.

A method of cleaning a cylinder head having a jet ignition insert attached to a spark plug well defined by the cylinder head with a pressurized fluid. The insert defines an opening in fluid communication with the spark plug well. The insert includes an end wall attached to the insert distal end to close one end of the opening and the end wall defines holes. The method utilizes a tool configured to clean the insert. A first engagement surface of the insert and a second engagement surface of the tool engage each other to form a seal that surrounds the holes of the insert such that the pressurized fluid is directed through the holes and into the opening of the insert during a first operation procedure of the tooling assembly to flush debris out of the holes of the insert.

An internal combustion engine includes an intake manifold, at least one cylinder head with a plurality of piston-cylinder-units, at least one ammonia source, and at least one hydrogen source. Each piston-cylinder-unit includes at least a main combustion chamber, at least one intake valve, a prechamber coupled to the main combustion chamber, and an ignition device in the prechamber. The at least one ammonia source is configured to provide ammonia to each piston-cylinder unit. The at least one hydrogen source is configured to provide hydrogen to each prechamber, wherein the at least one hydrogen source includes at least one reformer for cracking ammonia.