8.9.3 Engine coolant – Draining
Preconditions
☑
Engine is stopped and starting disabled.
Special tools, Material, Spare parts
Designation / Use
Part No.
Qty.
Sealing ring
(→ 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 preheater, if installed.
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 counterclock-
wise and remove.
3.
Draw off precipitated corrosion inhibitor oil
from the expansion tank through filler neck.
4.
Open drain plug and drain off coolant at en-
gine coolant pump (1).
118 | Task Description | MS150100/04E 2015-09
TIM-ID: 0000031871 - 002
