8.15.3 Engine coolant – Draining
Preconditions
☑ Engine is stopped and starting disabled.
Special tools, Material, Spare parts
Designation / Use Part No. Qty.
Sealing ring
(→ Spare Parts Catalog)
Sealing ring
(→ Spare Parts Catalog)
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 an appropriate container to drain the coolant into.
2. Switch off preheating unit.
Engine coolant – Draining
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 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 engine coolant pump;
• At the crankcase, left and right sides;
• At oil heat exchanger.
5. Close all open drain points.
6. Place breather valve on filler neck and close.
MS15018/03E 2016-02 | Coolant Circuit, General, High-Temperature Circuit | 121
TIM-ID: 0000000035 - 003
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