MTU 12V 2000 G23, Use And Maintenance Manual

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6 – 44 Cooling System, General, HT Circuit
6.15.2 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 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 precipitated corrosion inhibitor oil from
the expansion tank through filler neck.
4. Open drain cocks or drain plugs and drain
coolant at the following points:
• At the preheating unit;
• At the HT coolant pump;
• On the crankcase, right side.
5. Draining of residual coolant:
• On crankcase, left side;
On oil heat exchanger.
6. Seal all open drain points.
7. Set breather valve onto filler neck and close it.
M015560 / 00E 03-05 © MTU