5.9 After stopping the engine
Preconditions
☑ MTU Preservation and Represervation Specifications (A001070/..) are available.
☑ Engine is stopped and starting disabled.
NOTICE
Engine coolant with inadequate freeze protection. Water remaining in the pressure sensors freezes at
temperatures below 0 °C.
Risk of sensor damage!
• Remove pressure sensors and shake off residual water.
After stopping the engine
Item Action
Coolant circuit Drain engine coolant (→ Page 171) if
• freezing temperatures are expected, the engine is to remain out of service
for an extended period, but engine coolant has no antifreeze additive.
• the engine room is not heated.
• the coolant is not kept at a suitable temperature.
• the antifreeze concentration is insufficient for the engine-room tempera-
ture.
• the antifreeze concentration is 50% and the engine-room temperature is
below -40°C.
Engine control system Switch off (see manufacturer's documentation).
Air intake and exhaust sys-
tem
If the engine is to be taken out of service for longer than 1 week, seal the
engine on the air and exhaust side.
If the engine is to be taken out of service for longer than one month, it has to
be preserved (→ MTU Preservation and Represervation Specifications
(A001070/..)).
HP system (injector noise) The pressure is released in the system by means of the function “Blank Shot
Afterrun”:
• Injectors are energized.
• A small quantity is injected in the injector return without opening the nee-
dle in the nozzle. (actuation of the injector servo valve without injecting
fuel into the combustion chamber).
Explanation: The injectors do not leak permanently, which is why the pres-
sure applied in the system during engine stop is maintained. Pressure is only
released through actuation of the injectors. When actuated, the switched
quantities of the servo valve and the injection quantity are discharged. This
procedure results in injector noise.
Depressurizing (pressure <400 bar) is necessary for the following reasons:
• Limitation of load on high-pressure pumps during start
• Safety during assembly activities
MS15054/03E 2018-07 | Operation | 73
TIM-ID: 0000054740 - 003
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