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Lubricating system

Lubricating system


1. Camshaft, RH cylinder bank

2. Camshaft, LH cylinder bank

3. Vacuum pump

4. Camshaft bearing

5. Cylinder head, RH cylinder bank

6. Cylinder head, LH cylinder bank

7. Oil nozzle for transmission wheel

8. Intermediate gear, transmission

9. Oil cooler

10. Oil filter, pressure relief valve

11. Oil filter, primary flow

12. Oil filter, bypass valve

13. Crankcase

14. Oil level sensor

15. Oil sump

16. Oil strainer

17. Oil pump

18. Oil cooler

19. Oil reduction valve

20. Turbocharger

21. Crankshaft main bearing

22. Piston cooling nozzle

23. Connecting rod bearing

24. Piston

25. Gudgeon pin

Engine lubrication is by means of a force-feed lubricating system, in which the oil pressure is generated by a rotor pump comprising a rotor pinion and an offset ring gear. The pump is located in the lower timing cover and driven by the crankshaft. Oil is drawn up from the sump via a strainer and suction pipe into the oil pump. From the pump, the oil passes through the oil cooler to a large full-flow oil filter and then a partial flow filter and on to the main passage in the cylinder block, crankshaft bearing, camshaft bearing, turbocharger, timing gear and piston cooling.

The camshaft sprockets are lubricated via the camshaft bearings. Pistons and gudgeon pins are lubricated via the oil cooling nozzles and splash from the crankcase. The connecting rod bearings are lubricated via the oil passages in the crankshaft. Oil then runs back to the sump via drain holes in the cylinder head. The oil filter comprises a paper element fitted in a filter container. In case the filter should become blocked, there is a bypass valve fitted that leads the oil past the filter and ensure engine lubrication.

A reduction valve in the oil pump housing limits the oil pressure at the same time as it lead excess oil back to the suction side of the pump. There is a heat exchanger on the oil filter adapter, where the oil is cooled by the engine coolant. When the oil pressure becomes too low, the engine oil pressure sensor will ground the electrical circuit for the warning lamp located in the main instrument display panel.

Oil sump

The oil sump is in two parts. The bottom part is made in steel plate and is sealed with flange sealant. The top part is made of aluminium and contains the oil strainer, suction pipe and oil level sensor. The oil level sensor sends signals to the engine control module, which in its turn sends a message out on the bus. This is then displayed on the car's information display.

Oil filter

The insert oil filter is located in a filter housing integrated with the oil cooler heat exchanger. The filter is mounted on the cylinder block under the front cylinder member.