8.14.3 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 container to catch the coolant.
2. Switch off preheating unit.
Draining engine coolant
1. Turn breather valve on coolant expansion
tank counterclockwise to the first stop and
allow pressure to escape.
2. Continue to turn breather valve counterclock-
wise and remove.
3. Draw off precipitated corrosion inhibitor oil
from the coolant expansion tank through filler
neck.
4. Open drain screws and drain engine coolant
at the following drain points:
• At the preheating unit;
• At HT coolant pump (1);
• At crankcase (2) and (3), right side.
5. Close all open drain points.
6. Position breather valve on filler neck and
close.
MS15054/03E 2018-07 | Coolant Circuit, General, High-Temperature Circuit | 171
TIM-ID: 0000056881 - 001
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