7.15.4 Engine coolant – Draining
Preconditions
☑ Engine is stopped and starting disabled.
Special tools, Material, Spare parts
Designation / Use
Part No.
Qty.
Sealing rings
(→ Spare Parts Catalog)
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.
Draining engine coolant
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 precipitated corrosion inhibitor oil
from the expansion tank through filler neck.
4.
Open the drain valve at the drain point in
the coolant pipe to the engine-coolant cool‐
er and drain the coolant, (see unit manufac‐
turer).
5.
Draining of residual coolant:
• At the preheating unit, if applicable.
6.
Additional drain points:
• At the engine coolant pump elbow;
• At the crankcase, left and right sides.
• At the thermostat housings.
7.
Close all drain valves and install drain plugs
with new sealing rings.
8.
Set breather valve onto filler neck and close
it.
MS150025/02E 2012-10 | Task Description | 133
TIM-ID: 0000006733 - 001
