Power and exhaust system specifications (Mercedes-Benz C-Class W203)

Fuel
Fuel tank, l
Capacity	62
including fuel reserve	8
Petrol models
Unleaded gasoline no worse than AI-95/A-85, temporary use of unleaded gasoline no worse than AI-91/A-82.5 is possible. In this case, engine power will decrease slightly, with an increase in fuel consumption
Do not use fuel additives. They may cause increased wear or engine damage.
Diesel models
Summer and winter diesel fuel	No. 2 or No.1 according to ASTM D975
Do not use ship's (Marine Diesel Fuel), boiler and other diesel fuel.
When using diesel fuel with a sulfur content of more than 0.5%, change the engine oil every 10,000 km.
Winter fuel ensures normal operation down to -20°C.
Thanks to the fuel preheating when the vehicle's heating system is on, a vehicle running on winter diesel fuel can, as a rule, be operated without failure at outside temperatures down to -25°C.
Do not mix gasoline with diesel fuel.
When using summer diesel fuel, as well as at outside temperatures below -15°C, a certain amount of flow improver or kerosene, depending on the outside temperature, should be added to the fuel.
Flow improvers can also be used in combination with kerosene.
You can obtain a certificate of funds at the Mercedes-Benz service station.
The proportion of additive, taking into account the outside air temperature, should be minimal.
The proportion of kerosene in the mixture should not exceed 50%.
Add the additive to diesel fuel until the diesel fuel loses its fluidity due to paraffin emission. Malfunctions due to paraffin emission can only be eliminated by heating the entire fuel system.
Mix diesel fuel with kerosene only in the fuel tank. To do this, first pour kerosene into the tank, and then add diesel fuel.
After this, the engine must run for some time so that the mixture is distributed throughout the fuel system.
Fire hazard!
Kerosene additives lower the flash point of diesel fuel. This increases the danger when handling the fuel mixture. Observe the relevant safety regulations!
Petrol engine injection system	Electronic microprocessor system of distributed injection HFM with thermometric meter of intake air mass. Intake manifold with variable geometry
Diesel engine injection system	Electronic, microprocessor, with direct injection from a common rail "Common-Rail", turbocharger and intake air cooling
Fuel pressure, atm
Gasoline engines with connected vacuum	3.2 – 3.6
with vacuum off	3.7 – 4.2
Pressure drop
Immediately after the engine stops	3.0
In 30 min.	2.5
Fuel pump performance	1 l/35 sec
Exhaust gas content at full load
Gasoline engines CO ₂, %	8.8 – 9.8
Diesel engines CO ₂, %	9.8 – 10.8
Diesel smoke, no more than	1.9
O₂, %	0.1 – 0.5
CO in the exhaust pipe, %	max 0.5
NS, ppm	100
CO content at 2800 – 3100 rpm
CO, %	0.3
The meaning of lambda	0.98 – 1.02
Fuel injection pump
Drive	Double chain from crankshaft sprocket
Injection timing	It is set using a control pin, the piston of the 1st engine cylinder must be at TDC
Idle speed, rpm
Adjustment of the idle speed is not required as part of maintenance.
Diesel engine 611	650 - 850
Diesel engine 612	640 – 840
Speed limit, in min.	4500 - 4900
Tightening force of threaded connections, Nm
Tightening torques for fasteners are also given in the text of the Chapter and in some illustrations*.
*Tightening torques highlighted in bold in the text must be strictly observed; efforts not shown in bold are only approximate.
Injector clamp	7Nm +90°
Union nut of the injector pipeline	20
Fuel injection pump gear	40
Fuel injection pump flange	14
Fuel injection pump mount	9
Intake pipe to exhaust manifold	20
Bracket to transmission	25