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All moving parts are lubricated either by pressure or splash oil. Pressurized oil is also provided for operation of the variable valve timing units and the timing gear chain tensioners.
All of the oil system components are installed on the structural sump.
Oil is returned to the oil pan under gravity through large drain holes in the cylinder heads and the engine block to make sure quick return of the oil. Oil Pick-Up The plastic moulded oil pick-up is attached to the underside of the structural sump. It is immersed in the oil reservoir to provide a supply to the oil pump during all normal vehicle attitudes. A castellated inlet allows the supply to be maintained after any deformation of the sump pan (e.g. after grounding). A mesh screen in the inlet prevents debris from entering the oil system. Oil Pressure Switch Installed at the right front of the structural sump, the oil pressure switch connects a ground input to the instrument cluster when oil pressure is present. This switch operates at a pressure of 0,15 to 0,41 bar (2.2 to 5.9 lbf.in2). Oil Pump The oil pump is fitted at the front of the engine and is driven directly by the crankshaft. The inlet and outlet ports align with oil passages in the bedplate, with a rubber coated metal gasket to seal the pump to bedplate interface.
An integral pressure relief valve regulates pump outlet pressure at 4,5 bar (65.25lbf.in2). Oil Pan The oil pan/sump comprises an aluminium-alloy structural sump bolted to the bedplate and a pressed steel pan with integral sump plug, bolted to the structural sump. Oil Filler Cap The oil filler cap is located on the top of the left-hand bank valve cover. Windage Tray A windage tray attached to the top of the structural sump isolates the oil pan from the disturbed air flow, caused by the rotation of the crankshaft; preventing oil aeration and improving oil drainage. Crankcase Ventilation The engine is ventilated through a part-load and a full-load breather; one on each valve cover. These flexible plastic hoses incorporate O-ring seals and quick release connectors.
The part-load breather ventilates the left-hand valve cover (B-bank) and feeds onto the throttle body adaptor and the purge valve. This breather is connected between the oil separator in the cover and the induction elbow.
The full-load breather ventilates the right-hand cover (A-bank) and is connected between the oil |