3.2.1. Introduction

Diesel engine with a working volume of 2,0 l
1. Index of level of oil
2. Fan
3. Tag of the top dead point
4. Belt pulley of the crankshaft
5. Chain of the drive of the oil pump
6. Oil pallet
7. Oil pump
8. Crankshaft
9. Flywheel 		10. Piston
11. Cylinder
12. Oil filter
13. Withdrawal of an inlet pipe
14. Glow plug
15. Nozzle
16. Hydraulic dish-shaped pusher
17. Double vtulochno-roller chain

Diesel engine with a working volume of 2,0 l
1. Cam-shaft
2. Hydraulic dish-shaped pusher
3. Inlet channel
4. Withdrawal of an exhaust pipe
5. Thermostat (regulator of cooling liquid)
6. Piston
7. Rod
8. Oil pallet 		9. A stopper for discharge of engine oil
10. Oil pump
11. Crankshaft
12. Gear wheel of the fuel pump
13. The operating chain
14. Fuel pump
15. Withdrawal of an inlet pipe
16. Cable of management of a butterfly valve (gas cable)

2,0 l engine
80. Cam-shaft bearing cover
81. Cam-shaft bearing cover
82. Cam-shaft bearing cover
84. Bolts with a six-sided head, 25 N. of m.
84a. Pro-masonry washers
125. Cover of a head of the block of cylinders
185. Cam-shaft
186. Lock washer
187. Cylindrical pin 		188. Cam-shaft gear wheel
189. Pro-masonry washer
190. A bolt with a dodecahedral head, 25 N. of m + 90 °
203. Valve pusher
210. Chain of management
224. Natyazhitel of a chain
237. Pro-masonry sealing ring
400. Delivery oil pump

Mercedes C-class is equipped line, 4-or 5-cylinder diesel engines.

In diesel engines in the cylinder clean air is sucked in and is exposed to strong compression there. Thanks to it temperature in cylinders increases up to the temperature of ignition of diesel fuel (about 600 °C). When the piston is near the top dead point, fuel is injected into compressed air and self-ignites therefore there is no need for spark plugs. But in very cold engine compression cannot lead to ignition temperature. Therefore for heating in each vortex camera of the diesel there is a glow plug which eats from tension given via the relay of a preliminary warming up.

The fuel pump (the pump of nozzles) receives fuel from the toplivopodkachivayushchy pump. Diesel fuel moves in the fuel pump where the high pressure, necessary for its injection (100–125 bars) is created. The regulator of the fuel pump operates amount of injectable fuel according to actuating of a pedal of an accelerator. At the right time fuel is injected through nozzles into the precamera of the corresponding cylinder. Before fuel comes to the fuel pump, it passes through the heat exchanger. There fuel gets warm previously that strongly it was not condensed and did not create a stopper in fuel-supply lines and the filter. The fuel filter detains mechanical impurity and water and therefore it is extremely necessary to change the filter according to the maintenance manual.

Fuel and toplivopodkachivayushchy pumps do not need maintenance. Both pumps are put in action from a bent shaft through a chain of management which puts in action as well a cam-shaft. The opening in a head of the block of cylinders provides lubricant of each of two pumps with engine oil.
 
Engine model
C200
C220
C250
Release time with
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.
h.p. at rpm.

55/4600
75/4600

70/5000
95/5000

83/5000
113/5000
Torque, N. of m at rpm.
130/2000
150/3100
170/2800
Diameter of the cylinder, mm
87,0
89,0
87,0
Piston stroke, mm
84,0
86,6
84,0
Extent of compression
22
22
22
Number of cylinders
4
4
5
The number of valves on 1 cylinder
2
4
4
Fuel pump / management
4 mortars. / ARF
EVE
5 mortars. / ERE
Operating procedure of cylinders
1–3–4–2
1–3–4–2
1–2–4–5–3
Filling capacities:
 – engine oil (with the filter), l
6,0
6,5
7,0
 – okhdazhdayushchy liquid, l
8,0
7,0
7,5

ARF – recirculation of final gases
EVE – system of injection with the electronic and adjustable distributor
ERE – system of injection with consecutive electronic regulation