There is another path which takes the oil up from the crankshaft oil gallery to camshafts oil gallery in cylinder head and lubricates the camshaft. The camshaft oil gallery also provides the oil needed by the HLA. The relieved oil drains back to oil sump. The Lubrication System consists of the following components. 1. Oil Pump 2. Oil Filter. 3. Oil Strainer. 4. Hydraulic Lash Adjuster (HLA) 5. Piston Cooling Nozzles. 6. Oil Pressure Switch COMPONENTS 1. Oil Pump The oil pump is variable pressure control pump driven by crankshaft. Oil pump pressure is controlled by solenoid valve(SV) as per ECU demand. Electric connection is given to SV for regulating oil pressure. The main function of the oil pump is to circulate oil through the engine movable components. It sucks the oil from the oil sump through a strainer which prevents entrance of any particles into the pump, and supplies to the oil gallery. To keep the oil pump from building up too much pressure, a relief valve is also fitted inside the oil pump. 2. Oil Filter The oil filter used is a “SPIN ON TYPE” fitted to the oil cooler. The main function of oil filter is to filter all contaminants that get ingested into the engine, along with traces of worn out metals from bearings and other internal parts. The oil enters the oil filter under pressure through the holes on the perimeter of the base plate. The oil then passes through the filter element where it is “cleaned”, and then flows to the central tube and back into the engine, oil gallery. 3. Oil Strainer The oil strainer is fitted to the oil pump, through which the oil is drawn from oil sump and supplied to the oil gallery. The strainer acts like a filter and blocks the contaminants from entering the oil pump. Diesel Engine Ph-2 (CAFÉ) 89
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