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 a suitable receptacle to catch the coolant.
2.
Switch off preheating unit.
Engine coolant – Draining
1.
Turn breather valve on coolant expansion
tank counterclockwise to 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:
• At the preheating unit
• At the elbow of the engine coolant pump
• At crankcase, left and right sides
If an (optional) air compressor is instal‐
led, at the drain point on crankcase (left
side, free end):
Drain point on crankcase is not accessi‐
ble. Open supply hose at air compressor.
• At the EGR cooler, left and right side
(→ Step 6)
5.
Drain coolant at drain point, driving end, left
and right side (arrow pointing downwards).
6.
Drain residual coolant at the EGR cooler,
left and right side (arrows pointing up‐
wards).
7.
Drain coolant at donor cylinder flap
(→ Page 158).
156 | Task Description | MS150096/01E 2012-08
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