56 © Scania Industrial & Marine Engines 2003-10:1
FUEL
Diesel fuel oil
The composition of the diesel fuel oil has a great influence on the functioning
and the service life of the engine and the injection pump. The engine output
and exhaust emissions are also dependent on the fuel quality. The
requirements and testing standards for the most important properties are
described in the service manual in sections which can be ordered from Scania
dealers or directly from Scania. The address of Scania is printed on the cover.
The diesel fuel must meet European standard EN 590.
The table below shows the requirements for some of the most important
properties:
Environmentally favourable fuels (low sulphur fuels)
There are three classes of so called environmentally favourable fuels
(SS155435).
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 power output.
Only class 1 fuel should be used with a catalytic converter.
Short term use of fuel with a higher sulphur content than 0.05% by weight
will not cause permanent damage to the catalytic converter.
The catalytic converter may, however, require fuel with low sulphur content
for some time after this to regain its normal efficiency.
Property Requirement
Viscosity at 40°C 2.0 - 4.5 mm
2
/s (cSt)
Density at 15
°C 0.82 - 0.86 kg/dm
3
Sulphur (concentration by mass) max. 0.3%
Ignitability (CET rating) min. 49
Flashpoint 56°C
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