Lubrication System
| ITEM | DESCRIPTION |
|---|---|
| 1 | Intake camshaft |
| 2 | Exhaust camshaft |
| 3 | Turbocharger oil supply |
| 4 | Primary turbocharger |
| 5 | Crankshaft and connecting rods |
| 6 | Oil level and temperature sensor |
| 7 | Oil pan |
| 8 | Oil pump |
| 9 | Oil cooler and filter assembly |
| 10 | Piston cooling jets |
| 11 | Secondary turbocharger |
Oil is drawn from the oil pan and pressurized by the oil pump. The output from the oil pump is then filtered and distributed through internal oil passageways.
All moving parts are lubricated by pressure or splash oil. Pressurized oil is also provided for operation of the hydraulic valve tappets and the timing gear chain tensioners.
Oil Cooler And Filter Assembly
| ITEM | DESCRIPTION |
|---|---|
| 1 | Filter housing |
| 2 | O-ring seal |
| 3 | Filter element |
| 4 | Retaining bolt (6 of) |
| 5 | Coolant outlet connection |
| 6 | Oil cooler assembly |
The engine is lubricated by a force-feed oil circulation system with a full flow oil filter. The oil cooler forms a unit with the oil filter, which is mounted centrally in the middle of the cylinder block between the two banks of cylinders. The engine oil is cooled using the engine cooling system. For additional information, Refer to: ENGINE COOLING
Oil returns to the oil pan under gravity. Large drain holes through the cylinder heads and cylinder block ensure the quick return of the oil, reducing the volume of oil required and enabling an accurate check of the contents soon after the engine stops.
System replenishment is through the oil filler cap on the right camshaft cover.
The oil pick-up is immersed in the oil reservoir to provide a supply to the oil pump during all normal vehicle attitudes. A mesh screen in the intake prevents debris from entering the oil system.
Oil Pump
The oil pump is a G-rotor two stage pressure pump with solenoid control to switch between low and high pressure modes depending on engine speed and load to optimize fuel economy.
It is bolted to the front of the cylinder block. It is sealed by means of a gasket, which is recessed into the oil pump housing. The pump intake and outlet ports align with oil passages in the cylinder block.
The pumping element is an eccentric rotor, which is directly driven by flats on the crankshaft. An integral pressure relief valve regulates pump outlet pressure at 4.5 bar (65.25 lb/in2 ).
The front crankshaft oil seal is housed in the oil pump casing and is fitted such that its front face is 1 mm (0.04 in) under flush with the machined front face of the oil pump.
Oil Pan
| ITEM | DESCRIPTION |
|---|---|
| 1 | Primary turbocharger |
| 2 | Turbocharger oil feed pipes |
| 3 | Vacuum and oil scavenge pump |
| 4 | Oil scavenge pipe |
| 5 | Oil extraction tube |
| 6 | Secondary turbocharger - If equipped |
| 7 | Secondary turbocharger oil return tube - If equipped |
| 8 | Drain plug |
| 9 | Secondary reservoir |
| 10 | Primary turbocharger oil return tube |
Due to the wide range of inclines Land Rover vehicles operate across, the geometry of the oil pan has been configured to guarantee oil pick-up across all operating angles. An oil scavenge system has been developed to guarantee excellent oil flow through the turbochargers on severe side-slopes. At extreme angles there is a risk the turbochargers may be below the oil level in the oil pan, restricting oil return flow.
To overcome this, the engine uses:
- The oil pump to supply oil to the turbocharger bearings from the main reservoir of the oil pan.
- A secondary reservoir in the oil pan, sealed off from the main reservoir, to receive oil from the turbocharger bearings.
- The vacuum and oil scavenge pump to assist the oil flow from the turbocharger bearings by scavenging oil from the secondary reservoir into the right camshaft cover.
For service, a drain plug and an oil extraction tube are installed to drain the main body of the oil pan.