Maintenance and care
58
D
Before the engine is next put into operation (with the engine cold) check the coolant
level and top up if necessary
D
Repeat this procedure until no more coolant can be added
Note:
The turbochargers must not be bled while the cooling system is being topped up.
Danger:
If, in an
exceptional
case, the coolant level has to be checked in an engine that
has reached operating temperature, first carefully turn the cap
À
(large cap) with
safety valve to the first stop, let off pressure, then open carefully.
Note:
Don’t open the cooling system when the engine is at operating temperature.
This causes a pressure loss in the cooling system.
If the cooling system has been opened when the engine is at operating tempera-
ture this can lead to the alarm “pressure in the expansion tank” when the engine
is then put into operation and to a reduction in the engine output.
Coolant pressure in the expansion tank is only built up again when the engine
has cooled down. The cooling system must therefore only be filled up when the
engine is cold.