MTU 20 V 4000 G23 Operating Instructions Manual page 152

Alternatively: Filling coolant
through filler neck
1. Open venting point at distributor (arrow).
2. Fill in coolant in expansion tank via filler
neck until coolant level at top edge of filler
neck remains constant.
3. Close venting point when coolant emerges.
4. Check proper condition of breather valve on
coolant expansion tank, clean sealing faces
if required.
5. Fit breather valve and close it.
6. Start engine (→ Page 42).
7. After 10 seconds of running the engine
without load, shut down the engine
(→ Page 46).
8. Turn breather valve on coolant expansion
tank counterclockwise to the first stop and
allow pressure to escape.
9. Turn breather valve counterclockwise and
remove.
10. Check coolant level (→ Page 147) and top
up with coolant through the filler neck if re‐
quired:
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.
11. Repeat the steps from "Start engine"
(→ Step 6) until coolant no longer needs to
be topped up.
Final steps
1. Start the engine and run it without load for some minutes.
2. Check coolant level (→ Page 147) and top up coolant as required.
152 | Task Description | MS150093/01E 2012-06