Engine Lubrication: Description and Operation

Lubrication





Oil is drawn from the sump through a strainer and into the oil pump via the oil pick-up pipe. Pressurized oil from the pump passes through the oil cooler mounted in front of the radiator and returns to the full-flow oil filter element. Oil from the filter passes into the main oil gallery and through internal drillings to the crankshaft where it is directed to each main bearing and to the big-end bearings via numbers 1, 3 and 5 main bearings. Excess oil pressure is relieved by the oil pressure relief valve. An internal drilling in the cylinder block directs oil to the camshaft where it passes through further internal drillings to the hydraulic tappets, camshaft bearing journals and rocker shafts. Lubrication to the pistons, small ends and cylinder bores is by oil grooves machined in the connecting rods and by splash.