7.15.3 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 an appropriate container to drain the coolant into.
2.
Switch off preheating unit.
Engine coolant – Draining
1.
Turn breather valve of coolant expansion
tank counterclockwise until the first stop
and allow pressure to escape.
2.
Continue to turn breather valve counter‐
clockwise 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:
• Preheating unit
• Thermostat housing
• Twin elbow
• HT coolant pump elbow;
• Crankcase, left and right sides.
5.
Close all open drain points.
6.
Place breather valve on filler neck and
close.
178 | Task Description | M015710/04E 2012-09
TIM-ID: 0000000960 - 003
