7.16.4 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 receptacle to catch the coolant.
2. Switch off preheating unit.
Engine coolant draining
1. Turn breather valve of coolant expansion tank
counterclockwise until the first stop and al-
low pressure to escape.
2. Continue to turn breather valve counterclock-
wise and remove.
3. Draw off separated corrosion inhibitor oil in
expansion tank through the filler neck.
4. Open drain valves and/or drain plugs and
drain coolant at the following points:
• Drain plug (4)
• Crankcase (1)
• Intercooler (6)
• Exhaust-pipe elbow (5)
• Heating connection (3)
• Engine oil heat exchanger (2)
5. Close all open drain points.
6. Place breather valve on filler neck and close.
MS150031/06E 2016-010 | Coolant Circuit, General, High-Temperature Circuit | 207
TIM-ID: 0000006747 - 003
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