Power System and Exhaust Specifications (Mercedes-Benz W203 2000-2007: Power unit: Supply system)

Fuel
Fuel tank, l
Capacity	62
including fuel reserve	8
Petrol models
Unleaded gasoline is not worse than AI-95/A-85, temporary use of unleaded gasoline is not worse than AI-91/A-82.5. At the same time, engine power will decrease slightly, with an increase in fuel consumption
Do not use fuel additives. They can cause increased wear or damage to the engine.
Diesel models
Summer and winter diesel fuel	No. 2 or No. 1 according to ASTM D975
Do not use judgment (Marine Diesel Fuel), boiler room, etc. diesel fuel.
When using diesel fuel with a sulfur content over 0.5%, change the engine oil every 10,000 km.
Winter fuel, ensures normal performance down to -20°C.
Thanks to the preheating of the fuel when the vehicle's heating system is switched on, a winter diesel vehicle can generally be operated without failures at ambient temperatures down to -25°C.
Do not mix gasoline with diesel fuel.
If summer diesel fuel is used, and also at an outside air temperature below -15°C, a certain amount of flow improver or kerosene, depending on the outside temperature, must be added to the fuel.
Flow improvers can also be used in combination with kerosene.
You can get a certificate of funds at a Mercedes-Benz service station.
The proportion of the additive, taking into account the outside temperature, should be minimal.
The proportion of kerosene in the mixture should be no more than 50%.
Add the additive to the diesel fuel until the diesel fuel loses its fluidity due to the release of paraffin. Malfunctions due to waxing can only be eliminated by heating the entire power system.
Mix diesel fuel with kerosene only in the fuel tank. To do this, first fill the tank with kerosene, and then add diesel fuel.
After that, the engine must run for some time in order for the mixture to be distributed throughout the entire power system.
Fire hazard!
Kerosene additives lower the flash point of diesel fuel. As a result, the danger when handling the fuel mixture increases. Observe the relevant safety regulations!
Petrol injection system	Electronic microprocessor distributed injection system HFM with thermometric intake air mass meter. Intake manifold with variable geometry
Diesel injection system	Electronic, microprocessor, with direct injection from a common distribution line «Common-Rail», turbocharger and intake air cooling
Fuel pressure, Atm
Petrol engines, with connected vacuum	3.2 – 3.6
with vacuum off	3.7 – 4.2
pressure drop
Immediately after stopping the engine	3.0
After 30 min.	2.5
Fuel pump performance	1 l/35 sec
Exhaust gas content at full load
Gasoline engines CO₂, %	8.8 – 9.8
Diesel engines CO₂, %	9.8 – 10.8
Diesel smoke, no more	1.9
O ₂, %	0.1 – 0.5
CO in the exhaust pipe, %	Max. 0.5
HC, ppm	100
CO content at 2800 - 3100 rpm
CO, %	0.3
lambda value	0.98 – 1.02
injection pump
Drive unit	Double chain from crankshaft sprocket
Injection moment	It is installed using the control pin, the piston of the 1st cylinder of the engine must be at TDC
Idling revolutions, in min
The idle speed adjustment is not required as part of maintenance.
Diesel engine 611	650 - 850
Diesel engine 612	640 – 840
Restriction of turns, in min.	4500 - 4900
Tightening force of threaded connections, Nm
Fastener tightening torques are also given in the text of the Chapter and in some illustrations *.
*The tightening torques in bold type are subject to exact observance; Efforts not in bold type are indicative only.
nozzle clamp	7Nm +90°
Union nut of the nozzle pipeline	20
Injection pump gear	40
Flange injection pump	14
High pressure fuel pump mount	9
Downpipe to exhaust manifold	20
Bracket for transmission	25