1. Main timing chain lower guide2. Main timing chain lower guide bolt3. Oil pump casing4. Pump cover5. Driven gear6. engine gear7. Cover fixing bolts8. Pressure regulator valve cap9. Pressure regulator valve spring10. Pressure regulator valve11. Pressure regulator valve cap retaining ring12. Oil pump fixing boltsFunction:the oil pump ensures the circulation of the flow rate required for the forced lubrication of the various moving engine components.Location:the oil pump is fitted at the front of the crankcase (timing side) on the same axis as the crankshaft.Specifications:it is operated directly by the crankshaft through a key; the pressure regulating valve is housed on the pump ensuring the system operating pressure (between 4 and 6 bar); the pump gears have outer (engine) teeth and inner (driven) teeth; the flow rate varies with the number of revs.The pump draws in oil by means of the lower channel in the cylinder block and sends the pressurized oil flow via the channel in the left side of the cylinder block where the filter assembly is fitted.
Oil filter and cooling
1. Oil filter mounting2. Filter mounting gasket3. Filter mounting bolts4. Filter by-pass valve5. Oil filter cartridge6. Filter cartridge cover7. O-ring8. Heat exchanger by-pass valve9. Heat exchanger protection fixing bolt10. Heat exchanger protection11. Heat exchanger O-ring (small)12. Heat exchanger O-ring (large)13. Heat exchanger O-ring (oval)14. Heat exchanger bolts15. Exchanger16. Engine oil pressure sensor17. Engine oil sensor O-ringThe filter mounting is fitted on the left side of the crankcase; the filter cartridge is located inside held in place by a cover bolted onto the lower part of the mounting with the seal ensured by an O-ring; the filter by-pass valve is located on the cover.The oil pressure sensor, the water-oil heat exchanger and a by-pass valve for the exchanger are located on the filter mounting.The oil coming from the oil pump is sent via the exchanger and filtered by the filter cartridge, after which it continues on its journey through the engine ducts supplying the entire engine lubrication circuit, bearings, pistons, cylinder heads and timing chains.
Engine lubrication system diagram
The lubrication of the moving engine components is the forced type with the lubricating oil circulating by means of the oil pump on the same axis as the crankshaft; the oil is taken by the oil sump from the pump and sent via a channel on the left side of the crankcase to the oil filter; from the filter the oil flows, via the main duct in the crankcase, and then via two ducts that rise towards the left cylinder head and then go down to lubricate the crankshaft main journals and crank pins and two ducts that rise to lubricate the left cylinder head; having reached the cylinder heads the oil then lubricates the camshafts and supplies the hydraulic tappets and the phase transformers; the oil then returns to the sump by means of ports that go from the cylinder head to the sump.
