Schematic diagram of engine lubrication system 1 2 3 4 5 5 6 7 7 8 9 1 Oil line to crankshaft 5 Bores for main bearing lubrication 2 Injection pump lubrication 6 Oil pump with oil pressure relief valves 3 Lube oil lines to turbochargers 7 Bores for connecting rod bearing lubrication 4 Oil return line from turbochargers 8 Oil drain plug 9 Oil suction pipe 20