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7.15.3 Engine coolant – Draining
Preconditions
☑ Engine is stopped and starting disabled.
Special tools, Material, Spare parts
Designation / Use
Sealing rings
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 (if fitted).
Draining engine coolant
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 valves and drain plugs and
drain coolant at the following points:
• Preheating unit (if fitted)
• Thermostat housing (arrow)
• Twin elbow (arrow)
• Elbow of engine coolant pump
• Crankcase, left and right side.
118 | Task Description | MS150054/02E 2012-02
Part No.
(→ Spare Parts Catalog)
Qty.
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