7.15.8 Breather valve – Replacement
Preconditions
☑ Engine is stopped and starting disabled.
Special tools, Material, Spare parts
Designation / Use Part No. Qty.
Breather valve
(→ Spare Parts Catalog) 1
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
u Switch off preheating unit.
Breather valve – Replacement
1. Turn breather valve (1) on coolant expansion
tank counterclockwise to the first stop and
allow pressure to escape.
2. Continue to turn breather valve counterclock-
wise and remove.
3. Draw off separated corrosion inhibitor oil in
expansion tank via filler neck (2).
4. Fit new breather valve and close it.
132 | Coolant Circuit, General, High-Temperature Circuit | MS150119/01E 2016-02
TIM-ID: 0000067575 - 001
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