MTU — Engine coolant — Draining
Maintenance · Coolant circuit
From a MTU operator's manual covering: 20 V 4000 G23, 20 V 4000 G43, 20 V 4000 G63, 20V 4000, 20V 4000 Gx3. Check it applies to your exact model before use.
Applies to: MTU 20V 4000, MTU 20V 4000 Gx3 engine, MTU 20 V 4000 G23 engine, MTU 20 V 4000 G43 engine, MTU 20 V 4000 G63 engine, MTU 20V 4000 G83 engine
Before you start
- Coolant is hot and under pressure. Risk of injury and scalding. Let engine cool down. Wear protective clothing, gloves, goggles/safety mask.
Procedure
- Provide appropriate container.
- Switch off preheating unit.
- Turn breather valve of coolant expansion tank counterclockwise to first stop and allow pressure to escape.
- Continue to turn and remove breather valve.
- Draw off segregated corrosion inhibitor oil in expansion tank.
- Open drain cocks or drain plugs and drain coolant at preheating unit, thermostat housing, U-bend, HT coolant pump elbow, crankcase left and right side.
- Close all open drain points.
- Place breather valve on filler neck and close.
Full service-parts list: MTU 20V 4000 →
Source: MTU operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.