MTU 12V4000M93 series Operating Instructions Manual page 221

Filling coolant through filler
neck
1. Open vent points on distributor, oil heat ex-
changer and exhaust turbochargers (ar-
rowed).
2. Fill in coolant in expansion tank via filler neck
until coolant level at top edge of filler neck
remains constant.
3. When coolant emerges from the vent points,
close vent points one by one, proceeding
from the lowest point upwards.
4. Check satisfactory condition of breather
valve and clean sealing surfaces if required.
5. Place breather valve on filler neck and close
until it engages (first lock).
6. Start engine (→ Page 92).
7. After 10 seconds of engine operation without
load, shut down the engine (→ Page 101).
8. Turn breather valve counterclockwise and re-
move.
9. Check coolant level (→ Page 214) and top up
engine coolant as required:
a) Repeat the steps from "Start engine"
(→ Step 6) until coolant no longer needs
topping up.
b) Check satisfactory condition of breather
valve and clean sealing surfaces if re-
quired.
c) Place breather valve on filler neck and
close.
Final steps
1. Start engine and run without load for some minutes.
2. Check coolant level (→ Page 214) and top up coolant as required.
MS150047/05E 2018-08 | Coolant Circuit, General, High-Temperature Circuit | 219