Regulations and care
Treatment of cooling water
A4.05.09.01
M20-M601C
en / 20.01.2000 BA000202 1/3
Ĺ
1. Treatment of cooling water with corrosion inhibitors
Anticorrosive agents to be used in MaK engines must have been tested for their effectiveness
according to the rules of the “Forschungsvereinigung Verbrennungskraftmaschinen e. V.” (Research
Association for Internal Combustion Engines Inc).
MaK will issue a recommendation on the basis of the results of the test. No liability for the
anticorrosive agent used will be accepted because MaK is unable to control the recipe and treatment.
MaK has received positive test results for the agents mentioned in 1.1 and 1.2 or they have proven
effective over a long period of operation.
ĭSafety note:
No anti-corrosion oil emulsion must be used in case of systems heating living quarters by
engine cooling water or in case of shell cooling! In this cases use only chemicals!
1.1 Anti-corrosion oil
The fresh water is mixed outside the engine with anti-corrosion oil to form a stable emulsion.
For the initial filling or after cleaning the coolant circuit a
1.5 % emulsion
should be used and for the subsequent filling a
1.0 % emulsion
should be used.
The following anti-corrosion oils are known to us to be effective (alphabetical order, not
complete):
BP: FEDARO-M
Castrol: SOLVEX WT3
Esso: Kutwell 40
Shell: Dromus B
Shell Oil 9156
The preparation of the emulsion can generally be carried out as follows:
Add oil to the water (15 - 25 °C) and stir vigorously. For initial fillings take so much water that
a 10 % emulsion can be prepared with the required amount of anti-corrosion oil.
This 10 % emulsion is added to the cooling circuit which is already filled with 75 % of the
necessary cooling water amount, via the expansion tank. Topping up can be done with the
engine running.
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