7.12.4 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 container to catch the coolant.
2. Switch off preheating unit.
Engine coolant ‒ Draining
1. Turn valve cover on coolant expansion tank
counterclockwise to the first stop and re-
lease pressure.
2. Continue to turn valve cover counterclock-
wise and remove.
3. Draw off precipitated corrosion inhibitor oil
from the coolant expansion tank through
filler neck.
4. Open drain valves and/or drain plugs and
drain coolant at the following points:
• At the preheating unit;
• At the HT coolant pump (1);
• At the crankcase (1) and (2), right side.
5. Draining of residual coolant:
• At the crankcase (1) and (2), left side.
• At the oil heat exchanger.
6. Close all open drain points.
7. Position valve cover on filler neck and
close.
110 | Task Description | MS150118/00E 2014-07
TIM-ID: 0000053458 - 001
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