Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
High Pressure Oil System
The 6.0L diesel fuel injectors are powered by lubricating oil which is pressurized by a high pressure pump in the engine valley. The pump output pressure ranges from 3,102 to 27,579 kPa (450 psi to 4,000 psi). Oil pressure is controlled by the PCM through the injection pressure regulator (IPR) valve. The PCM controls pressure in the oil rail by opening (relieving pressure) and closing (increasing pressure) the IPR valve. The high pressure oil is delivered to the oil rails in the cylinder heads. An injection control pressure (ICP) sensor mounted on the high pressure pump cover sends an analog voltage signal (0.5 to 5.0 volts) to the PCM for feedback control of the oil pressure.
| Item | Part Number | Description |
|---|---|---|
| 1 | 6608 | Oil pump |
| 2 | 6A638 | Oil cooler |
| 3 | 6714 | Oil filter |
| 4 | - | High pressure reservoir (part of 6010) |
| 5 | 9A543 | High pressure oil pump |
| 6 | 9F838 | ICP sensor |
| 7 | 9C968 | IPR valve |
| 8 | - | Drain to crankcase (part of 6010) |
| 9 | 9D280 | High pressure oil rails |
| 10 | 9E527 | Fuel injectors |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.