1997-11:2 © Scania Industrial & Marine Engines 9
RUNNING
Check instruments and warning lamps at regular intervals.
Speed
The Scania tachometer is divided into different coloured sections as follows.
0 - 500 rpm red area: prohibited speed, passed when
starting and stopping.
500 - 700 rpm yellow area: low idle.
700 - 2200 rpm green area: normal operating speed.
Highest torque and lowest
fuel consumption at
1400 - 1600 rpm.
Low operating speed gives less
engine wear.
2200 - 2600 rpm yellow/green
striped: unsuitable operating speed. Can
arise when switching off and
when using engine brake downhill.
2600 - 3000 rpm red area: prohibited speed.
Coolant temperature
Correct coolant temperature during operation:
70 - 93 °C for system at atmospheric pressure.
70 - about 100 °C for system with positive pressure.
High coolant temperature leads to engine damage. Reduce the load on the
engine in order to lower the temperature. If the temperature does not drop,
stop the engine and look for the fault.
During long periods of operation with very low power take-off, the engine
may have difficulty in reaching 70 °C. However, if the load is increased, tem-
perature will rise.
Cooling systems with a
Scania radiator and plastic
expansion tank must not
have positive pressure in
the system, i.e. a pressure
cap must not be used on
the expansion tank.
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