MTU 12V4000C Series Operating Instructions Manual page 119

8.15.3 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 container in which to collect the coolant.
2. Switch off preheating unit.
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 counterclockwise 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:
• Elbow of HT engine coolant pump
• Crankcase, left and right sides.
• Preheating unit
5. Use torque wrench to tighten shut-off cock on elbow of engine coolant pump to specified tightening torque.
Name
Spindle
6. Use torque wrench to tighten shut-off cocks on crankcase, left and right sides, to specified tightening torque.
Name
Spindle
7. Close all remaining open drain points.
8. Place breather valve on filler neck and close.
Size Type
SW11 Tightening torque
Size Type
SW11 Tightening torque
MS150049/04E 2017-04 | Coolant Circuit, General, High-Temperature Circuit | 119
Lubricant Value/Standard
12 Nm
Lubricant Value/Standard
12 Nm