MTU 20 V 4000 G23 Operating Instructions Manual page 151

Filling coolant with pump
1. Connect appropriate pump with hose to the
drain valve of the engine coolant pump (ar‐
row).
2. Open venting point at distributor (arrow).
3. Open drain valve and pump coolant into en‐
gine at 0.5 bar minimum.
4. Close venting point when coolant emerges.
5. Fill expansion tank until overflow edge is
reached.
6. Close drain valve.
7. Check proper condition of breather valve on
coolant expansion tank, clean sealing faces
if required.
8. Fit breather valve 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 147) 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) Fit breather valve 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 | 151