6.12.4 Engine coolant – Draining
Preconditions
☑ Engine is stopped and starting disabled.
Special tools, Material, Spare parts
Designation / Use Part No. Qty.
Sealing rings
(→ 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.
Engine coolant – Draining
1. Provide a suitable receptacle to catch the
coolant.
2. Switch off preheating unit, if fitted.
3. Turn breather valve of coolant expansion tank
counterclockwise until the first stop and al-
low pressure to escape.
4. Continue to turn breather valve counterclock-
wise and remove.
5. Draw off separated corrosion inhibitor oil in
expansion tank through the filler neck.
6. Open drain plug at drain point in coolant line
to engine coolant cooler and drain coolant.
7. Draining of residual coolant:
• At the preheating unit, if fitted.
8. Drain engine coolant:
• At the elbow of the engine coolant pump
• At the crankcase, left and right side
• At the thermostat housing.
9. Close all drain valves and screw in drain
plugs with new sealing rings.
10. Place breather valve on filler neck and close.
114 | Task Description | MS150094/02E 2015-05
TIM-ID: 0000014583 - 002
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