42 © Scania Industrial & Marine Engines 1997-11:2
FUEL
Diesel fuel oil
The composition of the diesel fuel oil is extremely important for engine and
injection pump function and service life. Even engine output and exhaust
emissions are dependent on fuel quality. The requirements and testing norms
for the most important properties are described in the service manual in sec-
tions which can be ordered from your Scania dealer or directly from Scania.
The address for Scania is printed on the cover.
The table below shows the requirements for some of the most important prop-
erties:
Environmentally-friendly fuels (low sulphur fuels)
There are three classes of so-called environmentally-friendly fuels. Class 1 is
sulphur-free and class 2 is low in sulphur. Compared with class 3 (normal
fuel), these fuels are less dense and this reduces engine output. Only class 1
fuel should be used with a catalytic converter.
Property Requirement
Viscosity at 40 °C 2.0 - 4.5 mm
2
/s (cSt)
Density at 15
°C 0.80 - 0.86 kg/dm
3
Sulphur (concentration by mass) max 0.3 %
Ignition characteristic
(cetane number)
min 49
flash point 56 °C
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