Maintenance and Care
MAN marine diesel engines D2868 LE4.. / D2862 LE4..
90
Carefully read through the Operating Instructions before starting any work!
This particularly applies to the General Safety Instructions section
and the safety instructions in the various chapters.
Checking the coolant level
WARNING
Risk of injury due to hot fluid
Coolant reaches high temperatures during operation and causes scalding if touched.
For this reason:
S Only open the cooling system when the engine is at operating temperature in exceptional circumstan
ces.
S Carefully undo the cap with safety valve.
S Release the pressure.
S Carefully open the cap.
User tip
Do not open the cooling system when the engine is at operating temperature. Pressure will be lost in the
cooling system.
If the cooling system is opened when the engine is at operating temperature, this can cause a "Pressure
in expansion tank" alarm and reduced engine power when the engine is then operated.
The coolant pressure in the expansion tank only builds up again after the engine has cooled down. Only
top up the coolant when the engine is cold.
User tip
In case of overfilling, an excessive amount of filled coolant is discharged via the drain hoses during op
eration.
S Before the next startup (with the engine cold),
check the coolant level. The coolant level on
the sight glass
1
of the expansion tank must
be at the height of the "COLD LEVEL" mark or
higher.
S Top up the coolant if the coolant level is below
"min".
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