7.16.3 Engine coolant – Draining
Preconditions
☑ Engine is stopped and starting disabled.
WARNING
Coolant is hot and under pressure.
Risk of injury and scalding!
• Let the engine cool down.
• Wear protective clothing, gloves, and goggles / safety mask.
Preparatory steps
1. Provide a suitable vessel to catch the coolant.
2. Switch off preheating unit.
Draining engine coolant
1. Turn breather valve on filler neck of expan-
sion tank counterclockwise to first stop and
allow pressure to escape.
Note: The expansion tank is connected to the exter-
nal cooling system on engines with separate
heat exchangers.
2. Continue to turn breather valve counterclock-
wise and remove.
3. Draw off separated corrosion inhibitor oil in
expansion tank through the filler neck.
4. Open vent valves at the following points:
• On the carrier housing and at the crank-
case breather (1),
• On the seawater cooler (2) (in the case of
remote, off-engine heat exchanger).
5. Open drain screws and drain engine coolant
at the following drain points:
• On the elbow of the coolant pump (3),
• On the crankcase, left and right side (4).
Final steps
1. Close all open drain and vent points.
2. Position breather valve on filler neck and close.
236 | Task Description | MS150109/01E 2015-11
TIM-ID: 0000045403 - 002
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