Lubrication System
Oil is drawn from the reservoir in the oil pan and pressurized by the oil pump. The output from the oil pump is then filtered, cooled and distributed through internal oil passages.
All moving parts are lubricated by pressure or splash oil. Pressurized oil is also provided for operation of the variable valve timing units and the timing gear chain tensioners.
The 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 left-hand (LH) camshaft cover.
With the exception of the pump, all oil system components are installed on the structural sump.
Oil Pick-up
The fabricated steel 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 inlet prevents debris from entering the oil system.
Oil Pump
The oil pump is installed on the crankshaft at the front of the engine. The pump inlet and outlet ports align with oil passages in the bedplate.
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 lbf/in 2 ).
Oil Filter Assembly
| Item Number | Description |
|---|---|
| 1 | Oil temperature sensor |
| 2 | Oil pressure switch |
| 3 | Filter head |
| 4 | Seal |
| 5 | O-ring seal |
| 6 | Engine oil cooler |
| 7 | Mounting bolt |
| 8 | Gasket |
| 9 | Filter |
The oil filter is a replaceable cartridge with an internal bypass facility that permits full flow bypass if the filter is blocked. The oil filter is attached to the engine oil cooler, which is attached to a filter head installed on the front of the structural sump. The filter head also incorporates
- An oil pressure switch. Refer to «Instrument Cluster»(ref-568423) information.
- An oil temperature sensor. Refer to «Electronic Engine Controls»(ref-568420-S11644150242013072200000) information.
The engine oil cooler is a liquid-to-liquid heat exchanger cooled by engine coolant. The coolant feed and return hoses for the engine oil cooler are connected to the radiator lower hose. Refer to Engine Cooling information.
Oil Level Gage
The oil level gage locates along the left side of the oil pan, supported in a tube installed in the bedplate. Two holes in the end of the gage indicate the minimum and maximum oil levels. There is a difference of approximately 1.0 liter (1.0 US quart) between the two levels.
For additional information. Refer to Engine - 4.2L/3.0L information.
ENGINE OIL DRAINING AND FILLING
Special Tools
Tool Illustration Tool Name Tool Number Wrench, Oil filter 303-752
| WARNING | The spilling of hot engine oil is unavoidable during this procedure, care must be taken to prevent scalding. |
Note. Clean the components general area prior to dismantling.
- Raise and support the vehicle.
- Remove the air deflector. Refer to «Air Deflector»(ref-568406) information.
- Remove the oil pan drain plug. Position a container to collect the fluid. Discard the oil pan drain plug seal.
- Remove the oil filter. Position a container to collect the fluid. Discard the oil filter.
- Using the special tool, install the oil filter.
- Tighten the drain plug to 25 Nm. Install a new seal.
- Fill the engine with oil.
- Start engine and run at idle speed until the oil pressure warning light extinguishes. Stop the engine. Check for leaks.
- Install the air deflector. Refer to «Air Deflector»(ref-568406) information.
- Check and top-up the engine oil.