Man V12-1800, Installation Instructions Manual

Page: 77 / 92

First commissioning − Cooling system
75
Danger:
If in an exceptional case the coolant level has to be checked with the engine still hot from
operation, first carefully loosen the locking cap − relieve the pressure − then open carefully.
If the cooling system is opened with the engine hot
from operation, this will cause a loss of pressure in
the cooling system.
On continuing engine operation, this may lead to
the engine monitoring system MMDS triggering the
Pressure in expansion tank" alarm. The
consequence of this alarm is a reduction in engine
power.
There must be a pre−start up pressure of 0.7 bar in
the cooling system in order to be able to operate
the hot engine again, without the alarm, after
opening the locking cap.
To achieve this, a pressure valve
À is mounted on
the expansion tank, to which a normal
commercially−available air pump can be
connected. The pump can be used to pump the
system pressure up to 0.7 bar.
1