7.16.4 Exhaust flaps – Draining coolant from servomotors
Preconditions
☑Engine is stopped and starting disabled.
☑Operating voltage is not applied.
☑MTU Fluids and Lubricants Specifications (A001061/..) are available.
WARNING
Component is hot.
Risk of burns!
• Wear protective goggles.
WARNING
Coolant is hot and highly pressurized.
Risk of injury! Risk of scalding!
• Allow engine to cool down.
• Wear protective clothing, protective gloves, and safety glasses / facial protection.
Preparatory steps
1. Provide a suitable receptacle to catch the coolant.
2. Drain the respective coolant circuit:
• Donor cylinder flap: Drain engine coolant (→ Page 164).
• Bypass flap/EGR shutoff flap: Drain charge-air coolant (→ Page 174).
Note: The procedure is described for one exhaust flap only but also applicable to the other exhaust flaps.
Overview of exhaust flaps (→ Page 144).
Draining coolant
Note: Collect coolant in a suitable container.
1. Release union nut (4) at the lower coolant
line (3).
2. Carefully pull coolant line (3) out of the un-
ion.
3. Release union nut (1) at the upper coolant
line (2).
4. Withdraw coolant line (2) slightly out of
threaded adapter.
Note: Wait until coolant no longer emerges from
the lines.
5. Retighten union nuts (1, 4) on coolant
lines (2, 3).
166 | Task Description | MS150112/01E 2014-10
TIM-ID: 0000030758 - 003
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