7.16.4 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 on coolant expansion
tank counterclockwise up 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 HT coolant pump elbow;
• At the crankcase, left and right side.
5.
Additional drain points on 12/16V 4000 M
engines:
• T-piece (3) on engine driving end;
• Intercooler (2), left and right side;
• Carrier-housing cover (1), left and right
side.
6.
Close all open drain points.
7.
Place breather valve on filler neck and
close.
MW15412/05E 2011-11 | Task Description | 169
TIM-ID: 0000006745 - 002
