MTU 20 V 4000 G23 Operating Instructions Manual page 159

Filling coolant with pump
1. Connect a suitable pump with a hose to the
drain valve (arrowed).
2. Undo the vent line union at the distributor
piece (arrowed).
3. Open drain valve and pump coolant into en‐
gine at 0.5 bar minimum.
4. Tighten the union (arrowed) if coolant leaks
out at the loose union.
5. Fill expansion tank until overflow edge is
reached.
6. Close drain valve.
7. Check proper condition of breather valve
and clean sealing faces if required.
8. Set breather valve onto filler neck and close
it.
9. Start engine (→ Page 42).
10. After 10 seconds of running the engine
without load, shut down the engine
(→ Page 46).
11. Turn breather valve on coolant expansion
tank counterclockwise to the first stop and
allow pressure to escape.
12. Continue to turn breather valve counter‐
clockwise and remove.
13. Check coolant level (→ Page 155) and top
up coolant as required:
a) Fill in coolant in expansion tank until the
coolant level at top edge of filler neck
remains constant.
b) Set breather valve onto filler neck and
close it.
14. Repeat the steps from "Start engine"
(→ Step 9) until coolant no longer needs to
be topped up.
15. Disconnect pump and hose.
MS150093/01E 2012-06 | Task Description | 159