Engine Lubrication: Description and Operation

General Description

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A gear type oil pump is directly driven by the crankshaft and draws oil from the oil pan, via the suction pipe. The oil pressure created allows the oil to flow through the oil filter into the main oil gallery in the cylinder block. An oil pump pressure relief valve and oil filter bypass valve are incorporated in the system.
From the main oil gallery in the cylinder block, the cylinder head and crankshaft main bearings are supplied with oil. The camshaft bearings and hydraulic tappets are supplied through the main feed galleries in the cylinder head. Vent valves allow air to be expelled from the oil galleries in the cylinder head. The balance shaft journals are directly fed from the crankshaft main bearings. The connecting rod bearings are fed via passages in the crankshaft. The oil returns to the oil pan via passages in the cylinder block.