C Series Engine Diagrams Section E - Engine and System Identification Page E-7 Engine Diagrams Engine Views Marine Applications Starboard View, C 8.3, Six-Cylinder Sea Water Aftercooled 450C 1 Coolant fill 2 Expansion tank 3 Zinc plug (heat exchanger) 4 Coolant temperature sensor (coolant drain) 5 Belt guard 6 Heat exchanger coolant outlet tube 7 Engine mount (front) 8 Engine oil filter 9 Engine oil dipstick (optional starboard-side) 10 Oil pan 11 Fuel filter (optional starboard-side) 12 Engine oil drain, rear 13 Starter 14 Starter auxiliary magnetic switch 15 Turbocharger oil drain tube 16 Sea water inlet to heat exchanger 17 Exhaust outlet elbow 18 Inlet air crossover tube 19 Turbocharger (water cooled) 20 Sea water outlet to exhaust 21 Heat exchanger.