MTU 12 V 4000 M33F Operating Instructions Manual page 231

6.15.4 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 an appropriate container to drain the coolant into.
2. Switch off preheating unit.
Engine coolant – Draining
1. Turn breather valve on expansion tank (for engines with remote heat exchanger: the expansion tank is
part of the remote cooling system) counterclockwise up to the first stop and allow pressure to escape.
2. Continue to turn breather valve counterclockwise and remove.
3. Draw off precipitated corrosion inhibitor oil from the expansion tank through filler neck.
4. Open vent valves on carrier housing (1).
MS150069/02E 2014-03 | Task Description | 231