1997-11:2 © Scania Industrial & Marine Engines 43
Additives
At low temperatures, paraffin can precipitate and block filters and lines. This
can cause the engine to lose power or stop.
Winter fuel is usually available in cold climates. If necessary, the properties
of this can be improved before operating at low temperatures. However,
extremely low temperatures can cause problems.
The properties of the fuel when cold can be improved by doing one of the fol-
lowing before the temperature drops:
1. Lamp paraffin or heating oil: Max 50% may be added. Add the paraf-
fin first so that the fuel is blended fully. In a number of countries, the use
of paraffin as an engine fuel is prohibited.
2. Petrol: Only in emergencies and then no more than 30%. Petrol lowers
the ignition characteristics (cetane number) which can lead to difficulty
starting. There will also be emissions of blue smoke and fuel consump-
tion will be higher. Even very small quantities of petrol will lower the
flash point of the fuel which can mean the risk of fire.
3. Alcohol: 0.5 - 2% to prevent water in the fuel freezing to form ice.
4. Light diesel: Can be used for Scania engines in pure form or in the same
way as lamp paraffin to improve the properties of the fuel when cold.
Light diesel is paraffin with a suitable ignition characteristic and with a
lubricating additive. Without this, the injection pump would seize.
Drain fuel tank, drain fuel filter, clean the pre-filter and change
fuel filter regularly.
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