© Scania Industrial & Marine Engines
21
RUNNING
Check instruments and warning lamps at regular intervals.
Engine speed
The Scania tachometer is divided into different coloured sectors as follows.
Cruising speed
Important:
To achieve good operating economy and long engine life,
cruising speed should be about 200 rpm below maximum
engine speed.
Coolant temperature
Normal coolant temperature when the engine is running should be 70 - 90 °C.
DEC2: If the temperature is too high, 98 °C or above, the control system will
reduce engine power (Power -) in order to lower the temperature.
If the temperature continues to rise, the engine will be stopped automatically
(Shutdown) at 103 °C.
Excessively high coolant temperature can damage the engine.
If run for extended periods under an extremely light load, the engine may
have difficulty in maintaining normal operating temperature. However, the
temperature will rise to a normal level again when the load on the engine is
increased.
0-500 rpm
red area:
prohibited engine speed,
passed when stopping and
starting.
500-700 rpm
yellow area:
low idle.
700-2200 rpm
green area:
normal operating speed.
The engine’s operating
speed range is controlled by
the DEC2 control system.
2200-2600 rpm
yellow/green
striped:
unsuitable operating speed.
May occur when switching
off
2600-3000 rpm
red area:
prohibited engine speed
