Lubrication System-High Pressure

Lubrication System-High Pressure





The high pressure oil system is composed of two subsystems:
^ Injection Control Pressure (ICP) system
^ Fuel injector assembly

The hydraulic force necessary to inject fuel into the combustion chamber is provided by the ICP system. The fuel injectors on the engine are hydraulically actuated and electronically controlled. The ICP system is composed of these components:
^ Oil reservoir
^ Oil pump assembly (high-pressure)
^ Oil pump cover
^ High-pressure tubes
^ High-pressure rail assemblies
^ Injection Control Pressure (ICP) sensor
^ Injection Pressure Regulator (IPR) valve
^ Check valves

The high-pressure oil pump receives engine lube oil from a reservoir cast into the vee of the crankcase. This reservoir makes available a constant supply of engine oil from the pump. This reservoir is constantly refilled by the low-pressure lube oil system with filtered oil from a passage in the oil cooler housing.

The high-pressure oil pump is mounted at the rear of the crankcase and is driven by the camshaft gear. Oil is drawn from the oil reservoir through a 150 micron screen and into a passage to the pump inlet port. High-pressure oil from the pump is distributed to the injectors through a series of tubes and manifolds.

The high-pressure discharge tube is mounted to the pump and serves to connect the oil flow from the high-pressure oil pump to the rear engine tube assembly. This tube assembly divides oil flow into two tubes or branches, one for each side of the engine. Rigid tubes in each branch direct oil up into the high pressure oil rail of each cylinder head. Oil from the rails enter the injectors through O-ring sealed ports at the top of each injector. When the injector opening coil is energized, high-pressure oil is used to push fuel into the combustion chamber. After injection is complete, the oil inside the injector is vented through the top portion of the injector and allowed to drain back to the oil sump.