Schematic diagram of engine lubrication system 1 2 3 4 5 5 6 7 7 8 9 1 Oil line to crankshaft 6 Oil pump with oil pressure relief valves 2 Injection pump lubrication 7 Bores for connecting rod bearing lubrication 3 Lube oil lines to turbochargers 8 Oil drain plug 4 Oil return line from turbochargers 9 Oil suction pipe 5 Bores for main bearing lubrication 19