Lubrication System - High Pressure
| Item | Part Number | Description |
|---|---|---|
| 1 | 9A543 | Fuel injector pump assembly |
| 2 | 9C968 | Fuel Injection Pressure Regulator (IPR) valve |
| 3 | 6095 | Fuel pump cover |
| 4 | 9E527 | Fuel injector (8 required) |
| 5 | 9D280 | Fuel injector manifold assembly (right side) |
| 6 | 9F838 | Fuel Injection Control Pressure (ICP) sensor |
| 7 | 9A332 | Crankcase-to-head tube assembly (right side) |
| 8 | 9J332 | Rear engine tube assembly |
| 9 | 9A332 | Crankcase-to-head tube assembly (left side) |
| 10 | 9D280 | Fuel injector manifold assembly (left side) |
The high-pressure oil system is composed of 2 subsystems:
- Fuel 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 the following components:
- Oil reservoir
- Oil pump assembly (high pressure)
- Oil pump cover
- High-pressure tubes
- High-pressure rail assemblies
- ICP sensor
- Fuel Injection Pressure Regulator (IPR) valve
- Check valves
The high-pressure oil pump receives engine lube oil from a reservoir cast into the V 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 200-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 2 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 enters 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.