Technical data

6–44 Cooling S ystem, 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 o

ff 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 t he 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 br

eather valve onto filler neck and close it.