Diesel engine with a working volume of 2.0 l
1. Oil level indicator; 2. Fan; 3. Top dead center mark; 4. Crankshaft belt pulley; 5. Oil pump drive chain; 6. Oil pan; 7. Oil pump; 8. Crankshaft; 9. Flywheel 10. Piston; 11. Cylinder; 12. Oil filter; 13. Inlet pipe branch; 14. Glow plug; 15. Nozzle; 16. Hydraulic disc pusher; 17. Double roller chain
Diesel engine with a working volume of 2.0 l
1. Camshaft; 2. Hydraulic disc pusher; 3. Inlet channel; 4. Exhaust pipe branch; 5. Thermostat (coolant regulator); 6. Piston; 7. Connecting rod; 8. Oil pan 9. Engine oil drain plug; 10. Oil pump; 11. Crankshaft; 12. Fuel pump gear; 13. Control circuit; 14. Fuel pump; 15. Inlet pipe branch; 16. Throttle control cable (gas cable)
2.0L engine
80. Camshaft bearing cap; 81. Camshaft bearing cap; 82. Camshaft bearing cap; 84. Hexagon head bolts, 25 Nm.; 84a. Spacer washers; 125. Cylinder head cover; 185. Camshaft; 186. Lock washer; 187. Cylindrical pin; 188. Camshaft gear; 189. Spacer washer; 190. Hexagon head bolt, 25 Nm + 90°; 203. Valve tappet; 210. Control chain; 224. Chain tensioner; 237. Gasket sealing ring; 400. Oil injection pump
The Mercedes C-Class is equipped with in-line, 4- or 5-cylinder diesel engines.
In diesel engines, clean air is sucked into the cylinder and is subjected to strong compression. Due to this, the temperature in the cylinders rises to the ignition temperature of diesel fuel (about 600°C). When the piston is near the top dead center, the fuel is injected into the compressed air and ignites spontaneously, so there is no need for spark plugs. But in a very cold engine, compression cannot lead to ignition temperature. Therefore, for heating, each swirl chamber of the diesel engine has a glow plug, which is fed by voltage supplied through a preheating relay.
Fuel pump (injector pump) receives fuel from the fuel pump. Diesel fuel is fed to the fuel pump, where the high pressure required for its injection (100-125 bar) is created. The fuel pump regulator controls the amount of fuel injected in accordance with the actuation of the accelerator pedal. At the right moment, the fuel is injected through the nozzles into the pre-chamber of the corresponding cylinder. Before the fuel enters the fuel pump, it passes through a heat exchanger. There, the fuel is preheated so that it does not thicken too much and does not create plugs in the fuel lines and filter. The fuel filter retains mechanical impurities and water, and therefore it is extremely necessary to change the filter in accordance with the maintenance instructions.
The fuel and fuel lift pumps are maintenance-free. Both pumps are driven by the crankshaft via a control chain that also drives the camshaft. A hole in the cylinder head provides lubrication for each of the two pumps with engine oil.
Engine model | |||
C200 | C220 | C250 | |
| Release time from | 6/93 | 6/93 | 6/93 |
| Type | 202.120 | 202.121 | 202.125 |
| Engine | 601.913 | 604.910 | 605.910 |
| Working volume, cm³ | 1997 | 2155 | 2497 |
| Power, kW at rpm. hp at rpm. | 55/4600 75/4600 | 70/5000 95/5000 | 83/5000 113/5000 |
| Torque, Nm at rpm. | 130/2000 | 150/3100 | 170/2800 |
| Cylinder diameter, mm | 87,0 | 89,0 | 87,0 |
| Piston stroke, mm | 84,0 | 86,6 | 84,0 |
| Compression ratio | 22 | 22 | 22 |
| Number of cylinders | 4 | 4 | 5 |
| Number of valves per cylinder | 2 | 4 | 4 |
| Fuel pump/control | 4-speed / ARF | EVE | 5-speed / ERE |
| Cylinder firing order | 1–3–4–2 | 1–3–4–2 | 1–2–4–5–3 |
| Filling capacities: | |||
| - motor oil (with filter), l | 6,0 | 6,5 | 7,0 |
| – coolant, l | 8,0 | 7,0 | 7,5 |
ARF – exhaust gas recirculation
EVE – injection system with electronically controlled distributor
ERE – Electronically controlled sequential injection system