Maintenance and care
111
D
Stop the engine
D
Check the coolant at the sight glass (1) of the
expansion tank, which must be between “min"
and “max"
D
When topping up, carefully loosen the locking
cap (2) with safety valve -release the pressure-
then carefully open and fill up with coolant.
1
2
Danger:
Risk of scalding.
Note:
In the event of overfilling, excess coolant is ejected via the drainage hose during operation.
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, it is necessary to check the coolant level with the engine hot due to run
ning, first carefully loosen the locking cap (2) with safety valve -release the pressure- then open
carefully.
Note:
Do not open the cooling system when the engine is at operating temperature. This causes a pres
sure loss in the cooling system.
If the cooling system has been opened when the engine is at operating temperature, 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.
