Regulations and care
Changing the cooling water
A4.05.09.02
M20-M601C
en / 15.11.2000 BA020059 1/2
Ĺ
1. Changing the cooling water
1.1 Anti-corrosion oil emulsion
The anti-corrosion emulsion must be changed at the latest every 7500 operating hours, at least
annually if the 7500 operating hours are spread over a period of more than one year due to long
breaks in operation.
1.1.1 Cleaning the cooling water chambers before changing the emulsion
Stop engine and let cooling water cool down to 30 °C. First drain expansion tank with floating
oil then drain the entire system.
Remove water inlets on the crankcase and flush out any sludge which may have formed.
Fill engine with an alkali solution (e. g. P3T 308 from Messrs. Henkel 0.5 % solution) and run it
for approximately 12 hours. Stop engine and let it cool down to 30 °C.
Drain the cleaning solution and flush engine thoroughly with fresh water.
Then put in 90 % of the required amount of water. With the remaining 10 % and the required
amount of anti-corrosion oil (according to diagram II: A4.05.09.04) prepare a highly
concentrated emulsion.
Attention:
Always add oil to water!
Add the emulsion to system via the expansion tank.
1.2 Chemical corrosion inhibitors
When recirculating cooling water has chemical corrosion protection the cooling water does not
need changing.
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