7.8.3 Engine coolant – Draining
Preconditions
☑ Engine is stopped and starting disabled.
Special tools, Material, Spare parts
Designation / Use Part No. Qty.
Engine coolant
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 preheater, if installed.
Engine coolant – Draining
1. Turn breather valve of filler neck on coolant
expansion tank counterclockwise to first
stop and allow pressure to escape.
2. Continue to turn breather valve counter‐
clockwise and remove.
3. Draw off precipitated corrosion inhibitor oil
from the expansion tank through filler neck.
4. Open drain screw and drain off coolant at
engine coolant pump (1).
MS15025/00E 2011-12 | Task Description | 51
TIM-ID: 0000035572 - 001
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