MTU 12V4000C Series Operating Instructions Manual page 121

Filling with coolant using a
pump
1. Connect appropriate pump with hose to drain
valve.
2. Open drain valve and pump coolant into en-
gine at 0.5 bar minimum.
3. Fill expansion tank until overflow edge is
reached.
4. Close drain valve.
5. Check proper condition of breather valve and
clean sealing faces if required.
6. Place breather valve on filler neck and close.
7. Start engine (→ Page 47).
8. After 10 seconds of running the engine with-
out load, shut down the engine (→ Page 49).
9. Turn breather valve of filler neck on coolant
expansion tank counterclockwise to first stop
and allow pressure to escape.
10. Continue to turn breather valve counterclock-
wise and remove.
11. Check coolant level (→ Page 116) and top up
engine coolant as required:
a) Fill in coolant in expansion tank until the
coolant level at top edge of filler neck re-
mains constant.
b) Place breather valve on filler neck and
close.
c) Repeat the steps from "Start engine"
(→ Step 7) until coolant is no longer
needed to be topped up.
d) Disconnect pump and hose.
Filling with coolant through filler neck
1. Alternatively: Fill in engine coolant via filler neck on expansion tank until engine coolant level remains con-
stant at top edge of filler neck.
2. Check proper condition of breather valve and clean sealing faces if required.
3. Set breather valve onto filler neck and turn until the first stop.
4. Start engine (→ Page 47).
5. After 10 seconds of running the engine without load, shut down the engine (→ Page 49).
6. Turn valve cover counterclockwise and remove.
7. Check coolant level (→ Page 116) and top up engine coolant as required:
a) Repeat the steps from "Start engine" (→ Step 4) until coolant is no longer needed to be topped up.
b) Check proper condition of breather valve and clean sealing faces if required.
c) Place breather valve on filler neck and close.
Final steps
1. Start the engine and run it without load for some minutes.
2. Check coolant level (→ Page 116) and top up engine coolant as required.
MS150049/04E 2017-04 | Coolant Circuit, General, High-Temperature Circuit | 121